Silverthin Slewing Rings and Bearings - 电子画册在线预览、各类电子画册在线制作-云展网平台

Engineering Precision with Every Revolution

SLEWING RINGS & PINIONS

Web: https://www.rstbearing.com.cn

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沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

Engineering Precision with Every Revolution

ISO Registration Information

Silverthin™ is an ISO 9001 registered manufacturer

of Thin Section and Slewing Ring bearings,

Silverthin™ Quality Management System is registered

to the ISO 9001 standard by BSI, Inc. A copy of our

quality registration is available on request and our

quality and manufacturing systems are open to audit

by our customers.

Our Quality Policy

Our Quality Policy focuses on increasing customer

satisfaction through:

• Strategic management of our corporation

• Consistently meeting customer requirements

• Continuous improvement of our processes

The management and employees of Silverthin™ are

committed to meeting customer requirements and

expectations. We want to assure our customers that

we have a Quality Management System capable of

providing quality products and services on time.

Manufacturing

Silverthin™ Bearing Group specializes in the

engineering, manufacturing, sales and marketing

of Thin Section and Slewing Ring (also known as

Turntable) bearings.

Our flexible manufacturing systems allow us to

provide a wide variety of standard and custom

bearing configurations across a broad range of sizes.

Silverthin™ Bearing Group manufactures large

diameter, Thin Section ball bearings for defense,

industrial, robotic, semiconductor, medical, energy

and distribution markets. Silverthin™ Thin Section

bearings are manufactured in the United States in

standard and custom configurations, sealed and

unsealed, up to 37” in diameter. Components are

stocked to meet customer short lead-time and

customization requirements.

Silverthin™ Slewing Ring bearings are manufactured

in facilities located in Asia to Silverthin specifications

with inspection and customer specific modifications

performed in Preston, WA. Standard and custom

Slewing Ring bearings are engineered and

manufactured up to 70 inches in diameter, some from

special materials, to serve the needs of our diverse

customer base.

The Silverthin™ Advantage:

• Experienced customer service representatives who

provide fast, reliable, and friendly customer service.

• Flexible manufacturing and inventory management

systems that offer among the industry’s best lead

times.

• Engineered products including standard, modified

standard, and custom designs to meet specific

application requirements.

• Complete application, product, and manufacturing

engineering support.

SLEWING RINGS & PINIONS

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Tel: 024 22945833 22923833 24853899 Fax: 024 88729249 Mobile: 13940483518 15640413155（微信）

沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN SLEWING RINGS & PINIONS

866-294-5841 www.silverthin.com

Engineering Precision with Every Revolution

Inner Ring and Outer Ring

The bearings are comprised of two rings, each of which contains

a precision raceway that is induction hardened on the surface to

a specified depth. Each ring is made from a medium carbon steel

forging. Silverthin™ SK and ST Series bearings have raceways

constructed in a four-point contact configuration, with 45° contact

angles as standard. Other raceway configurations are available,

such as crossed roller and eight-point contact. These other

options are often considered in cases where very high loads or

special stiffness requirements are needed.

Rolling Elements

Precision rolling elements (specifically hardened chrome alloy steel

balls for Silverthin™ SK and ST Series bearings) facilitate relative

ring rotation between the inner and outer rings. Rollers as rolling

elements are also often used.

Spacers, Spacer Balls & Separators

Spacers, typically made from a plastic material, are commonly

used to separate balls to prevent them from rubbing directly

against each other. Sometimes spacer balls are utilized instead

of spacers. In this case these are balls that are slightly smaller

than the load carrying balls, placed between each load carrying

ball. Occasionally, application parameters warrant the use of a

separator.

Mounting Holes

Mounting holes are generally spaced around the faces of the

inner and outer ring along a uniform bolt circle and equal spacing.

These holes can be thru holes, tapped holes, blind tapped holes,

counter-bored holes, etc. Sometimes bolt circle or spacing

requirements need to be customized to meet the demands of a

specific application, in which case custom options are available.

In the case of either the standard part numbers listed in this

catalog, or other custom versions provided by Silverthin™, the

equipment designer, manufacturer, or user is responsible to

determine that the mounting design is adequate.

Seals

Seals are provided on each side of the bearing, with their

primary functions being grease retention and prevention of some

contamination such as dust and debris from entering the bearing.

The seals are typically made from an extruded Buna-N rubber

strip, and in smaller sizes are a metallic non-contact shield.

Load Plug

Due to the nature of the race hardening process, there is a gap in

the race hardness of each race. In that location for the non-geared

ring, or the outer ring for ungeared bearings, a hole is drilled to

permit the loading of balls into the final slewing ring assembly. This

hole is plugged and secured with a taper pin. Note that for the ring

where a load plug is not present, an ‘S’ is stamped on the face of

that ring at the location of the unhardened gap in the race (also

known as the soft spot). Removal of the load plug voids the

warranty.

Taper Pin

Secures load plug to the inner or outer ring.

Gear

Slewing ring bearings can be supplied as ungeared, or with gears

on either the ID of the inner ring or the OD of the outer ring. Gears

are typically a standard stub involute spur gear with backlash

provisions and AGMA Q8 quality minimum. Details for each

bearing can be found in the enclosed dimensional tables, and

drawings are available from Silverthin™ Engineering. Custom gear

configurations are also available.

Grease Fitting

At least one grease fitting is included in one of the rings. The

quantity may increase with the diameter of the bearing. For

bearings with gears, the grease fitting(s) are located on either the

ID or OD of the ungeared ring. For ungeared bearings, Silverthin™

ST and SK Series slewing rings come equipped to accommodate

grease fittings on either the inner or outer ring. Custom quantities,

locations and configurations for grease fittings are available.

Part Numbers

Part numbers and serial numbers are etched on one of the faces

of the bearing.

Silverthin™ Slewing Ring Bearings - Components

(Turntable Bearings)

SEALS

SPACERS, SPACER BALLS

Or SEPARATORS

ROLLING ELEMENTS

INNER RING

MOUNTING HOLES

GREASE FITTING

OUTER RING

TAPER PIN

GEAR

PART NUMBERS

LOAD PLUG

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沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN SLEWING RINGS & PINIONS

www.silverthin.com 866-294-5841

Engineering Precision with Every Revolution

Silverthin Slewing Ring Bearings - Technical

Service Factors

To determine if a Silverthin™ Slewing Ring bearing is appropriate for an application,

a SERVICE FACTOR is applied. Refer to the table below for a guide to the service

factor to apply to your application. The load rating curves shown in this catalog are

approximate, and represent an application service factor of 1.00. To determine the

required bearing rating, multiply the applicable service factor by the applied loads

on the bearing, and compare the resultant loads to the load rating curves.

If you require any assistance in determining an applicable service factor, or would

like a more detailed load rating curve (recommended if your service factor adjusted

applied loads fall close to, or beyond, the load rating curves shown in this catalog),

please contact Silverthin™ Engineering for assistance. Please note that the

equipment designer is responsible for determining the correct service factor, often

validated by testing.

Class

of Service Typical Considerations Application Examples

Minimum

Service

Factor

LIGHT Well defined loading Tire mounted light duty construction 1.00

Loading well below capacity Light duty Index table 1.00

Rotation slow, <10% of time and intermittent Light duty industrial manipulator or robot 1.00

Light duty hand operated mechanism 1.00

Light duty medical devices 1.00

Light duty aerial platforms 1.00

Welding positioners 1.00

Rotating signs, displays 1.00

MEDIUM Well defined loading Track mounted light duty construction 1.10

Loading near or below capacity Scrap yard construction 1.25

Rotation slow, <30% of time and intermittent Medium duty industrial manipulator or robot 1.25

Conveyors 1.10

Rotary tables 1.25

Capstans and turnstiles 1.10

Wastewater treatment 1.10

HEAVY Loading not well defined Forestry handling equipment 1.50

Loading beyond machine capacity can occur Heavy duty index tables and turntables 1.50

Shock loading can occur Excavators 1.50

Rotation intermittent, up to 100% of time

SPECIAL Loading not well defined Alternative energy (wind, hydro, etc) TBD

Continuous rotation Offshore application TBD

High speed rotation Amusement rides TBD

Heavy loads, shock, impact Steel mill applications TBD

High precision, positioning Precision robotics TBD

Web: https://www.rstbearing.com.cn

Tel: 024 22945833 22923833 24853899 Fax: 024 88729249 Mobile: 13940483518 15640413155（微信）

沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN SLEWING RINGS & PINIONS

866-294-5841 www.silverthin.com

Engineering Precision with Every Revolution

SILVERTHIN SLEWING RINGS & PINIONS

866-294-5841 www.silverthin.com

Engineering Precision with Every Revolution

Mounting – Tension versus Compression

As mentioned earlier, it is best to mount the bearings

in “compression” as shown below. This ensures that

the load is carried by the balls, which is represented

in the load curve provided. Tension mounting has

significantly less capacity, as then the bolt strength

becomes the primary consideration for capacity.

H/2

H/5

Compression

axial load

Tension (suspended)

axial load

Speed

Silverthin™ Slewing Ring Bearings are used most

commonly where rotation is slow, oscillating, and/

or intermittent. For speed limit calculations please

contact Silverthin Engineering.

Accuracy

Silverthin™ Slewing Ring Bearings are not typically

provided with diameter tolerances. Some slewing ring

applications require a higher degree of accuracy. For

engineering and design support on special applications please contact Silverthin Engineering.

Environment

Silverthin™ Slewing Ring Bearings are often used

indoors, and outdoors where exposure to moisture

and significant contamination is possible. Normal

temperature ranges -40°F to +140°F (-40°C to +60°C)

are standard. Slewing rings designed to operate in

harsher environments are available from Silverthin,

contact a Silverthin Engineer early in your design

process to identify the best bearing system solution

for extreme environments.

Typical Application

“Typical application” of Silverthin™ Slewing Ring

Bearings will exhibit the conditions listed below.

Special consideration must be given to bearing

selection and features whenever the application

conditions differ from those considered “typical”.

Those typical application conditions are:

• Vertical axis of rotation. Essentially, the bearing

mounted “flat”.

• Compressive thrust and moment loads being

predominant compared to tension loading.

• Radial load limited to less than 10% of the thrust

load.

• For single row bearings, intermittent rotation (not

continuous) should not exceed a pitch-line velocity

of 500 feet/minute.

• Operating temperature between -40ºF to +140ºF.

• Mounting surface geometry and installation

procedures to assure roundness and flatness of

both races. An example approach would be to

apply a centered thrust load while tightening the

bolts using the alternating star pattern method.

• Periodic checking of mounting bolts to verify proper

tension is provided for.

• Periodic lubrication is provided for.

Load Capability

Silverthin™ Slewing Ring Bearings are designed to

accommodate significant radial, thrust and moment

loads as shown below:

This is accomplished in most cases by

the unique four point contact raceway

geometry, which is similar in concept

to Silverthin™ X-Type Thin Section

bearings. This allows a single bearing

to accommodate all three loading scenarios noted

above, either individually or a combination thereof.

RADIAL LOAD AXIAL LOAD MOMENT LOAD

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沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN SLEWING RINGS & PINIONS

www.silverthin.com 866-294-5841

Engineering Precision with Every Revolution

.120

.110

.100

.090

.080

.070

.060

.050

.040

.030

.020

.010

.000

0 10 20 30 40 50 60 70 80 90

Raceway Diameter Pd - (in.)

Allowable Deflection δd - (in.)

100 110 120 130 140 150 160 170 180

3.0\" Ball

2.5\" Ball

2.0\" Ball

1.5\" Ball

1.0\" Ball

.75\" Ball

Allowable Deflection vs Raceway Diameter

Must not occur within 90° nor more than once

in 180° of circumferential travel

H/5

H/2

H/5

Minimum Mounting Structure Guidelines

Generally, this rule of thumb will provide adequate

structural integrity.

Mounting

Mounting surfaces need to be machined accurately for

proper function of the bearing. Where standard bolt

patterns cannot be accommodated, contact Silverthin

Engineering for alternative options. Consideration

must be given to mounting in tension or compression.

In tension, BOLT strength becomes the limiting load

consideration, the load curve no longer applies, and

special considerations must be made. See additional

guidelines below.

DISH Radial Distance

Flatness & Mounting Surface Dish

(Mounting Surface)

Flatness of the bearing mounting surface is critical to

optimal performance. Frequently mounting structures

are welded or worked in a way to induce stresses into

the structure. These stresses must be relieved, following

which the bearing mounting surface must be machined

flat. Flatness must be considered:

• Circumferential Direction (δr):

The amount of out-of-flatness allowable in the

circumferential direction for four-point ball bearings is

shown in the figure below.

This amount of out-of-flatness must not be exceeded

in a span less than 90°, and not more than once in a

span not more than 180°.

• Allowable Dish or Perpendicularity Deviation in the

Radial direction (δp): For four-point contact ball

bearing designs, this amount of dish allowable can be

approximated using the formula:

δp ≈ 0.001 ∗ Dw ∗ P

Where: P = radial dim of the mounting structure face (in)

Dw = rolling element diameter (in)

Note that if an application requires greater precision or

low rotational torque, it may be necessary to reduce

the values of δr and δp. For roller bearings, the amount

of flatness allowable is approximately 2/3 of that for an

equivalent sized four-point contact ball bearing.

Web: https://www.rstbearing.com.cn

Tel: 024 22945833 22923833 24853899 Fax: 024 88729249 Mobile: 13940483518 15640413155（微信）

沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN SLEWING RINGS & PINIONS

866-294-5841 www.silverthin.com

Engineering Precision with Every Revolution

SILVERTHIN SLEWING RINGS & PINIONS

866-294-5841 www.silverthin.com

Engineering Precision with Every Revolution

Bolts

It is always suggested that bolts be selected with

the advice and assistance of a fastening hardware

supplier. Bolt quality, pretensioning procedures, and

maintenance can vary widely.

The optimal bolting arrangement has a bolt circle in

both the inner and outer races with equally spaced

fasteners. This results in a more uniform mounting

arrangement, yielding the best performance between

the bearing and the fasteners. This is not always

possible due to mounting structure arrangements,

and holes may be shifted accordingly. In these

cases testing is recommended to determine actual

bolt loads, validate joint configuration and assembly

procedure.

As a starting point to determine the approximate load

on the heaviest loaded bolt, the following formula

can be used. Please note that Silverthin™ makes

no warranty, expressed or implied, regarding bolt

adequacy. It is strongly recommended that testing be

performed to determine the actual load, as this is the

only reliable way to be certain.

RB = ±

12 * M * r

BC * n

Sf = Bolt Proof Load Rating

Bolt Diameter

(in)

Proof Load

(lbs)

1/2 17,000

5/8 27,100

3/4 40,100

7/8 55,400

1 72,700

1 - 1/8 91,600

1 - 1/4 116,300

1 - 1/2 168,600

Lubrication

Grease is the most common lubricant used in

slewing ring bearings and gear applications. Regular

lubrication through provided grease fittings or grease

holes is required for proper operation on standard

slewing rings. For special lubrication options, contact

Silverthin.™

Friction Moment

(Rotation Torque)

The Friction Moment can be estimated for a slewing

ring bearing using the formula noted below. The

resulting values assume that the bearing is mounted

according to the guidelines outlined in this catalog.

This estimate only applies when load is applied to the

bearing, and does not reflect starting torque in an

unloaded condition. Also not considered are frictional

torque generated by the lubricant, seals and weight

of the components. This does however provide

a starting point, and with additional experience

adjustments can be made in the assembly to

accommodate for additional torque.

Where: Mf = μ * (4.4M + Fa Dpw + 2.2 Fr Dpw)/2

Mf = Bearing starting torque under load (ft-lbs)

μ = Coefficient of friction (0.006 typically)

M = Moment load (ft-Ibs)

Fa = Axial load (Ibs)

Fr = Radial load (Ibs)

Dpw = Bearing pitch diameter (ft)

Where: RB = Total load on heaviest loaded bolt (Ibs)

M = Moment load (ft-Ibs)

r = Rigidity factor. Use 3 for bearings and

support structures of average stiffness.

Fa = Axial load (lbs)

If Fa is in tension, the sign is +

If Fa is in compression, the sign is -

Refer to section “Mounting - Tension versus

Compression”

BC = Bolt circle diameter (in)

n = Total number of equally distributed bolts

Sf = Bolt factor of Safety. Minimum

recommended value = 3. See formula

below.

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沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN SLEWING RINGS & PINIONS

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Engineering Precision with Every Revolution

Other Bolting Recommendations:

1. Use hexagon head high strength bolts with coarse

threads according to SAE J429, Grade 8 or ASTM

A490/A490M or ISO 898-1, Grade 10.9 tensioned

to 70% of their yield strength.

2. Use hexagon head coarse thread nuts where

applicable according to SAE J995, Grade 8 or

ASTM A563, Grade DH or ISO 898-2, Class 10.

3. For optimal bolt tension, the ratio of the distance

from the bottom of the bolt head to the first

thread of engagement should be 3.5 or greater.

Testing is required for validation.

4. All mounting bolts in a given ring should have

equal clamp length.

5. The distance between the head of the bolt and

the bolt threads should be at least equal to the

bolt body diameter.

6. Thread engagement length of the bolt in the

mating steel structure should be at least 1.25

times the bolt diameter.

7. Bench tests are recommended to validate that the

bolt tensioning method achieves desired results

prior to equipment testing.

Securing Bearing to the Mounting Surface

When installing the bearing, it is important to

ensure that the bearing is as round as possible.

This will optimize load distribution and promote the

smoothest operation. The following procedures are

recommended as an aid.

Use hardened round flat steel washers in accordance

with ASTM F436 under the head of the bolt, and also

the nut. Lockwashers, and locking compounds on the

thread, are not recommended.

Install the washers, nuts and bolts in the bearing

and supporting structure and hand tighten. Do not

distort the bearing in order to install bolts. Apply a

moderate centered thrust load to the bearing. Tighten

the bolts to the equipment designer’s specifications.

A common approach is to use a star pattern to

tighten the bolts, sequences as shown in the diagram

below. The pattern is usually done in 3 steps at

approximately 30%, 80% and 100% of the final bolt

torque or tension level specified by the equipment

designer.

Loss of proper tension can lead to premature bolt

failure, failure of the bearing and structure, damage

to components, and fatality or injury to anyone in

the vicinity. The bolts require frequent inspection for

proper tension, which is commonly accomplished by

measuring torque of the bolt.

Custom Slewing Ring Bearing Options

from Silverthin™

Aside from the standard slewing ring options listed

in this catalog, Silverthin™ offers a wide range and

variety of custom options. These can be either

modified versions of standard bearings, or completely

custom options, both to accommodate desired

solutions. These include but are not limited to:

• Special overall dimensions (bore, OD, widths, offsets).

• Lube holes and grease fittings (additions, subtractions, locations, face mounted, recessed, sizes).

• Special gear geometries, hardness.

• Internal geometry optimization (increased load

capacity, increased precision for runouts).

• Internal fit (preload or clearance).

• Special hole patterns and configurations, such as:

• Accommodate higher speeds or continuous

operation (add separator).

• Locating holes, pins or pilots.

• Special sealing configurations.

Through

Hole

Threaded

Through Hole

Far Side

Threaded Hole

Threaded

Blind Hole

CounterBored Hole

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沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN SLEWING RINGS & PINIONS

866-294-5841 www.silverthin.com

Engineering Precision with Every Revolution

SILVERTHIN SLEWING RINGS & PINIONS

866-294-5841 www.silverthin.com

Engineering Precision with Every Revolution

OVERALL DIMENSIONS MOUNTING HOLES

SILVERTHIN

P/N

(in)

Hi /Ho (in)

Appx.

Wt.

(lbs)

Inner Ring Outer Ring

Moment

Rating

(ft - lbs)

(in)

No. of

Holes

n i

B i

(in)

No. of

Holes

n o

(in)

STO-050 4.331 1.968 0.787 0.728 2 2.480 8 0.26 3.818 8 0.26 515

STO-050T 4.331 1.968 0.787 0.728 2 2.480 8 M6 3.818 8 M6 515

STO-065 5.315 2.559 0.866 0.787 4 3.149 8 0.354 4.724 8 0.354 910

STO-065T 5.315 2.559 0.866 0.787 4 3.149 8 M8 4.724 8 M8 910

STO-122 8.898 4.803 1.339 1.142 13 5.512 12 0.354 8.189 12 0.354 5700

STO-122T 8.898 4.803 1.339 1.142 13 5.512 12 M8 8.189 12 M8 5700

STO-143 9.803 5.63 1.339 1.142 15 6.496 12 0.433 8.937 12 0.433 7080

STO-143T 9.803 5.63 1.339 1.142 15 6.496 12 M10 8.937 12 M10 7080

STO-145 11.811 5.709 1.968 1.732 37 6.890 16 0.565 10.630 16 0.565 19050

STO-145T 11.811 5.709 1.968 1.732 37 6.890 16 5/8-11 10.630 16 5/8-11 19050

STO-145X 12.286 5.709 1.968 1.732 41 6.890 16 0.594 10.630 16 0.594 21800

STO-170 12.205 6.693 1.811 1.614 33 7.874 12 0.512 11.024 12 0.512 17080

STO-170T 12.205 6.693 1.811 1.614 33 7.874 12 M12 11.024 12 M12 17080

STO-210 14.37 8.268 1.575 1.496 38 9.449 20 0.562 13.190 16 0.562 24170

STO-210T 14.37 8.268 1.575 1.496 38 9.449 20 5/8-11 13.190 16 5/8-11 24170

STO-210X 14.686 8.268 1.968 1.732 48 11.614 20 0.594 13.190 16 0.594 31330

STO-265 16.535 10.433 1.968 1.732 54 11.614 24 0.562 15.354 18 0.562 41770

STO-265T 16.535 10.433 1.968 1.732 54 11.614 24 5/8-11 15.354 18 5/8-11 41770

STO-265X 17.086 10.433 1.968 1.732 61 11.614 24 0.594 15.354 18 0.594 48670

STO-324T 20.486 12.770 2.062 2.022 105 14.375 20 5/8-11 18.875 20 5/8-11 63390

STO-324X 20.486 12.770 2.375 2.063 105 14.375 20 0.688 18.875 20 0.688 75200

STO SERIES

H HO

L O

L i

H Hi HO

L i

L O

• Four-point contact ball

• Rectangular cross-section

• Non-gear

• Clearance

• Dimensions up to 72” OD

NO GEAR SLEWING RING

*This diagram for STO-050

and STO-065 only.

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沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN SLEWING RINGS & PINIONS

www.silverthin.com 866-294-5841

Engineering Precision with Every Revolution

OVERALL DIMENSIONS GEAR DATA - α = 20° MOUNTING HOLES

SILVERTHIN

P/N

(in)

Hi /Ho (in)

Appx.

Wt.

(lbs)

Tooth

Form

(in)

Gear

Dia.

Pitch Pd

Max Gear

Tooth

Load

F2 (lbs)

No. of

teeth

Z 2

Inner Ring Outer Ring

Moment

Rating

(ft - lbs)

(in)

No. of

Holes

n i

B i

(in)

No. of

Holes

n o

(in)

STE-145 12.286 5.709 1.968 1.732 38 FS 12.000 5/7 7140 60 6.890 16 0.562 10.630 16 0.562 18700

STE-145T 12.286 5.709 1.968 1.732 38 FS 12.000 5/7 7140 60 6.890 16 5/8-11 10.630 16 5/8-11 18700

STE-145X 12.286 5.709 1.968 1.732 38 FS 12.000 5/7 7140 60 6.890 16 .594 10.630 16 .594 21430

STE-210 14.686 8.268 1.575 1.496 38 FS 14.400 5/7 5810 72 9.449 20 .562 13.190 16 .562 23690

STE-210T 14.686 8.268 1.575 1.496 38 FS 14.400 5/7 5810 72 9.449 20 5/8-11 13.190 16 5/8-11 23690

STE-210X 14.686 8.268 1.968 1.732 44 FS 14.400 5/7 7290 72 9.449 20 .594 13.190 16 .594 30720

STE-265 17.086 10.433 1.968 1.732 57 FS 16.800 5/7 7330 84 11.614 24 .562 15.354 18 .562 40940

STE-265T 17.086 10.433 1.968 1.732 57 FS 16.800 5/7 7330 84 11.614 24 5/8-11 15.354 18 5/8-11 40940

STE-265X 17.086 10.433 1.968 1.732 57 FS 16.800 5/7 7330 84 11.614 24 .594 15.354 18 .594 47700

STE-324T 20.486 12.750 2.062 2.022 105 FS 20.200 5/7 8700 101 14.375 20 5/8-11 18.875 20 5/8-11 62130

STE-324X 20.486 12.770 2.375 2.063 105 FS 20.200 5/7 8863 101 14.375 20 .688 18.875 20 .688 73750

STE-415 24.650 16.250 2.375 2.063 132 SD 24.250 4 10420 97 17.750 20 .813 22.250 16 .813 101370

STE-415T 24.650 16.250 2.375 2.063 132 SD 24.250 4 10420 97 17.750 20 3/4-10 22.250 16 3/4-10 101370

STE-470 26.900 18.500 2.375 2.063 147 SD 26.500 4 10460 106 20.000 24 .813 24.500 18 .813 125300

STE-470T 26.900 18.500 2.375 2.063 147 SD 26.500 4 10460 106 20.000 24 3/4-10 24.500 18 3/4-10 125300

STE-540 29.650 21.250 2.375 2.063 163 SD 29.250 4 10520 117 22.750 28 .813 27.250 24 .813 157590

STE-540T 29.650 21.250 2.375 2.063 163 SD 29.250 4 10520 117 22.750 28 3/4-10 27.250 24 3/4-10 157590

STE-590 33.534 23.125 2.875 2.563 283 SD 33.000 3 17290 99 24.875 24 .938 30.625 18 .938 213320

STE-590T 33.534 23.125 2.875 2.563 283 SD 33.000 3 17290 99 24.875 24 7/8-9 30.625 18 7/8-9 213320

STE-705 38.201 27.750 2.875 2.563 325 SD 37.667 3 17390 113 29.500 28 .938 35.250 24 .938 371940

STE-705T 38.201 27.750 2.875 2.563 325 SD 37.667 3 17390 113 29.500 28 7/8-9 35.250 24 7/8-9 371940

STE-730 41.850 28.750 3.250 2.880 491 SD 41.200 2.5 21290 103 31.000 24 1.063 38.000 20 1.063 468100

STE-730T 41.850 28.750 3.250 2.880 491 SD 41.200 2.5 21290 103 31.000 24 1-8 38.000 20 1-8 468100

STE-870 47.444 34.250 4.250 3.875 771 SD 46.800 2.5 31620 117 36.250 28 1.188 43.875 24 1.188 920970

STE-870T 47.444 34.250 4.250 3.875 771 SD 46.800 2.5 31620 117 36.250 28 1 1/8-7 43.875 24 1 1/8-7 920970

STE SERIES

H Hi HO b2

L i

L O

ST (geared)

• Four-point contact ball

• Rectangular cross-section

• External gear, AGMA 8 quality minimum

• Clearance

• Dimensions up to 72” OD

EXTERNAL GEAR SLEWING RING

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Engineering Precision with Every Revolution

SILVERTHIN SLEWING RINGS & PINIONS

866-294-5841 www.silverthin.com

Engineering Precision with Every Revolution

SK6 SERIES

ø.688 Through

Equally Spaced

ø.688 Through

Equally Spaced

.470 ±.040

(1.103)

(1.811)

2.205 ±.040 (1.811) R.090 Max.

R.090 Max.

L i

• Four-point contact ball

• Flanged cross-section on non-geared rings

• Non-gear

• Clearance

• Dimensions up to 60\" OD

NO GEAR SLEWING RING

OVERALL DIMENSIONS GEAR DATA - INV. STUB - α = 20° MOUNTING HOLES

SILVERTHIN

P/N

(in)

d i

(in)

d r

(in)

d o

(in)

Appx.

Wt.

(lbs)

(in)

Gear

Dia.

Pitch

Max Gear

Tooth

Load

F2 (lbs)

No. of

teeth

Z 2

Inner Ring Outer Ring

Moment

Rating

(ft - lbs)

(in)

No. of

Holes

n i

(in)

No. of

Holes

n o

SK6-16PZ 20.390 16.220 17.870 11.970 14.490 16.142 58 - - - - 13.130 12 19.250 8 23300

SK6-22PZ 25.510 21.340 22.990 17.090 19.610 21.260 76 - - - - 18.130 15 24.380 12 33630

SK6-25PZ 29.450 25.280 26.930 21.030 23.550 25.200 89 - - - - 22.130 18 28.380 12 50150

SK6-29PZ 33.390 29.212 30.870 24.970 27.490 29.134 104 - - - - 26.130 18 32.250 15 53100

SK6-33PZ 37.320 33.150 34.800 28.90 31.420 33.070 118 - - - - 30.000 18 36.250 18 57400

SK6-37PZ 41.260 37.090 38.740 32.840 35.360 37.010 132 - - - - 34.000 20 40.130 18 65000

SK6-43PZ 47.170 43.000 44.650 38.750 41.270 42.913 153 - - - - 39.880 24 46.000 18 74900

• Four-point contact ball

• Flanged cross-section on non-geared rings

• Internal gear, AGMA 8 quality minimum

• Clearance

• Dimensions up to 60\" OD

ø.688 Through

Equally Spaced

.470 ±.040

(1.103)

(1.811)

2.205 ±.040 (1.811) R.090 Max.

L i

1/2-13-UNC-2B

.750 Min.Full Thread

Equally Spaced INTERNAL GEAR SLEWING RING

OVERALL DIMENSIONS GEAR DATA - INV. STUB - α = 20° MOUNTING HOLES

SILVERTHIN

P/N

(in)

d i

(in)

d r

(in)

d o

(in)

Appx.

Wt.

(lbs)

(in)

Gear

Dia.

Pitch

Max Gear

Tooth

Load

F2 (lbs)

No. of

teeth

Z 2

Inner Ring Outer Ring

Moment

Rating

(ft - lbs)

(in)

No. of

Holes

n i

(in)

No. of

Holes

n o

SK6-16NZ 20.390 16.339 17.870 12.850 - 16.260 65 13.250 4 6800 53 14.880 12 19.250 8 23300

SK6-22NZ 25.510 21.340 22.990 17.600 - 21.260 90 18.000 4 6530 72 19.630 15 24.380 10 33630

SK6-25NZ 29.450 25.280 26.930 21.600 - 25.200 106 22.000 4 6400 88 23.630 18 28.380 12 50150

SK6-29NZ 33.390 29.213 30.870 25.600 - 29.134 121 26.000 4 6300 104 27.630 18 32.250 15 53100

SK6-33NZ 37.320 33.150 34.800 29.133 - 33.070 148 29.667 3 8520 89 31.500 18 36.250 18 57400

SK6-37NZ 41.260 37.090 38.740 33.133 - 37.007 165 33.667 3 8420 101 35.500 20 40.130 18 65000

SK6-43NZ 47.170 43.071 44.650 39.133 - 42.992 188 39.667 3 8340 119 41.500 24 46.000 18 74900

Web: https://www.rstbearing.com.cn

Tel: 024 22945833 22923833 24853899 Fax: 024 88729249 Mobile: 13940483518 15640413155（微信）

沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN SLEWING RINGS & PINIONS

www.silverthin.com 866-294-5841

Engineering Precision with Every Revolution

ø.688 Through

Equally Spaced

.470 ±.040

(1.103)

(1.811)

2.205 ±.040

R.090 Max.

L O

1/2-13-UNC-2B

.750 Min.Full Thread

Equally Spaced

• Four-point contact ball

• Flanged cross-section on non-geared rings

• External gear, AGMA 8 quality minimum

• Clearance

• Dimensions up to 60\" OD

EXTERNAL GEAR SLEWING RING

OVERALL DIMENSIONS GEAR DATA - INV. STUB - α = 20° MOUNTING HOLES

SILVERTHIN

P/N

(in)

d i

(in)

d r

(in)

d o

(in)

Appx.

Wt.

(lbs)

(in)

Gear

Dia.

Pitch

Max Gear

Tooth

Load

F2 (lbs)

No. of

teeth

Z 2

Inner Ring Outer Ring

Moment

Rating

(ft - lbs)

(in)

No. of

Holes

n i

(in)

No. of

Holes

n o

SK6-16EZ 19.900 16.220 - 11.970 14.490 16.142 72 19.500 4 5560 78 13.130 12 18.000 8 23300

SK6-22EZ 25.150 21.340 - 17.090 19.610 21.260 96 24.750 4 5650 99 18.130 15 23.250 12 33630

SK6-25EZ 29.150 25.280 - 21.030 23.550 25.200 115 28.750 4 5700 115 22.130 18 27.250 15 50150

SK6-29EZ 32.900 29.220 - 24.970 27.490 29.134 128 32.500 4 5740 130 26.130 18 31.000 18 53100

SK6-33EZ 37.200 33.150 - 28.900 31.420 33.070 152 36.667 3 7580 110 30.000 18 35.000 18 57400

SK6-37EZ 41.200 37.090 - 32.840 35.360 37.008 172 40.667 3 7620 122 34.000 20 38.879 18 65000

SK6-43EZ 46.867 42.992 - 38.750 41.270 42.193 189 46.333 3 7680 139 39.880 24 44.750 20 74900

SK6 SERIES

LOAD CURVES

SK6 A SK6-43

B SK6-37

C SK6-33

D SK6-29

E SK6-25

F SK6-22

G SK6-16

80,000

70,000

60,000

50,000

40,000 MOMENT (FT-LBS)

THRUST (LBS)

30,000

20,000

10,000

0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000

NOTE: The load curves in this section reflect a

generic curve for both the STO and STE Series

Slewing Ring bearings. The load capacities for the

STO Series is actually slightly greater than is shown

in the curves in this section. As noted earlier in the

Service Factor section of this catalog, if the actual

loading, adjusted with an applicable service factor,

falls near or below the appropriate curve, please

contact Silverthin™ Engineering for a more precise

curve.

Web: https://www.rstbearing.com.cn

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沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN SLEWING RINGS & PINIONS

866-294-5841 www.silverthin.com

Engineering Precision with Every Revolution

SILVERTHIN SLEWING RINGS & PINIONS

866-294-5841 www.silverthin.com

Engineering Precision with Every Revolution

LOAD CURVES (continued)

MOMENT (FT-LBS)

THRUST (LBS)

2,000

1,000

3,000

4,000

5,000

6,000

8,000

7,000

0 10,000 20,000 30,000 40,000 50,000 60,000 70,000

A STO-143

B STO-122

C STO-065

D STO-050

E STO/STE-324X

F STO/STE-324T

G STO/STE-265X

H STO/STE-265

I STO/STE-210X

J STO/STE-210

K STO/STE-170

L STO/STE-145X

M STO/STE-145 MOMENT (FT-LBS)

THRUST (LBS)

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

0 50,000 100,000 150,000 200,000 250,000 300,000

N STE-870

O STE-730

P STE-705

Q STE-590

R STE-540

S STE-470

T STE-415 MOMENT (FT-LBS)

100,000

200,000

300,000

400,000

500,000

600,000

700,000

800,000

900,000

1,000,000

0 200,000 400,000 600,000 800,000 1,000,000 1,200,000 1,400,000

THRUST (LBS)

Web: https://www.rstbearing.com.cn

Tel: 024 22945833 22923833 24853899 Fax: 024 88729249 Mobile: 13940483518 15640413155（微信）

沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN SLEWING RINGS & PINIONS

www.silverthin.com 866-294-5841

Engineering Precision with Every Revolution

SILVERTHIN SLEWING RINGS & PINIONS

www.silverthin.com

Engineering Precision with Every Revolution

Pinions

Silverthin™ is pleased to offer standard, high

quality mating pinions from stock for our ST and

SK series slewing ring bearings. These pinions are

made to AISI 4140 steel and are hardened to have

a surface hardness of 55-60 HRC. See below for

dimensional data.

Mating Pinions for SK Series Bearings

GEAR DATA (a = 20°) OUTLINE DIMENSIONS AND WEIGHT

TOOTH

FORM z1 Pd

(in)

Do1

(in)

Dr1

(in)

Di1

(in)

Approx

(lbs) BEARING P/N PINION P/N

SK6-16 thru SP1629-14 SD 14 4 2 2.88 3.5 3.9 2.88 1 1/4 6.4

SK6-29 SP1629-17 17 4 2 2.88 4.25 4.65 3.63 1 10

SK6-33 thru SP3343-14 SD 14 3 2 2.88 4.667 5.2 3.88 1.25 5/16 11.4

SK6-43 SP3343-17 17 3 2 2.88 5.667 6.2 4.88 1.25 18.3

Tolerances Ref. +/-0.015 +/-0.015 Ref. +.000/-

.010 Ref. +0.002/-

.000

Mating Pinions for STE Series Bearings

GEAR DATA (a = 20°) OUTLINE DIMENSIONS AND WEIGHT

TOOTH

FORM z1 Pd

(in)

Do1

(in)

Dr1

(in)

Di1

(in)

Approx

(lbs) BEARING P/N PINION P/N

STE-145 thru SP145324-14 FD 14 5/7 2.25 2.88 3.4 3.686 2.806 1 1/4 6.6

STE-324 SP145324-17 17

STE-415 thru SP415540-14 SD 14 3 2 2.88 3.5 3.9 2.88 1 1/4 6.4

STE-540 SP415540-17 17 3 2 2.88 4.25 4.65 3.63 1 10

STE-590 thru SP590705-14 SD 14 3 2 2.88 4.667 5.2 3.88 1.25 5/16 11.4

STE-705 SP590705-14 17 3 2 2.88 5.667 6.2 4.88 1.25 18.3

STE-870 SP870-17 SD 17 2.5 4.3 5.825 6.8 7.44 5.51 2.675 5/8 46.2

Tolerances Ref. +/-0.015 +/-0.015 Ref. +.000/-

.010 Ref. +0.002/-

.000

Di1

Dr1

D01

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Engineering Precision with Every Revolution

Gear

Pitch Dia,

D2 (in.)

Min

Backlash,

J (in.)

Maximum Backlash (in.)

Diametral Pitch (Pd)

1.5 1.75 2 2.5 3, 4, 5

20 0.014 0.029 0.027 0.025 0.023 0.022

30 0.015 0.030 0.028 0.026 0.024 0.023

40 0.016 0.031 0.029 0.027 0.025 0.024

60 0.018 0.033 0.031 0.029 0.027 0.026

80 0.020 0.035 0.033 0.031 0.029 0.028

100 0.022 0.037 0.035 0.033 0.03 0.030

120 0.024 0.039 0.037 0.035 0.033 0.032

Pinion/Gear Backlash

Backlash, sometimes referred to as play, is the

amount of clearance between mating gears. (See

Figure Below). For our purposes, the backlash would

be between the slewing ring gear and mating pinion.

This feature is often controlled by the center distance

between the slewing ring and pinion, which can be

either fixed or adjustable depending on the demands

of the application. See typical backlash ranges table.

Typical Backlash Ranges

Silverthin Responsibility Statement -

Warranty, Error and Omissions

Silverthin Bearing Group of Mechatronics Inc. assumes no

responsibility for errors or omissions in this catalog. Silverthin

Bearing Group reserves the right to change information or

specifications without notice. Application and use of this

product is the sole responsibility of the user. Failure of, or

improper selection of, or improper use of, the products

described herein or related items can cause death, personal

injury and property damage. Before you select or use any

product or system, it is important that you analyze all aspects

of your application and review information concerning the

product or system. The user, through its own analysis and

testing, is solely responsible for making the final selection of the

product and assuring that all performance, safety and warning

requirements of the application are met.

Silverthin Bearing warrants the product to be free from defects

in materials and workmanship only. Sellers only obligation

hereunder is to either repair or replace the defective product or

work within 12 months of product delivery to our customers.

No other warranties are expressed or implied in fact or by

law. Silverthin Bearing Group is not liable for associated costs

of work done by the buyer involving our product, or altered

product.

Web: https://www.rstbearing.com.cn

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沈阳瑞思达轴承有限公司 SHENYANG TOTAL BEARING CO.,LTD.

SILVERTHIN™

PRECISION THIN-SECTION BEARINGS

American Made . . .

American Owned . . .

and . . .

Ready to Serve Your

Global Requirements

• Class 1000 Clean Room

• 100% DFAR Compliant

• Standard and Customized Configurations

• Special Materials Available

- Stainless Steel

- Ceramics

- Corrosion Resistant Coatings

• Custom Sizes Available

• Clearance, Preload, Duplexing, Universal Grinding

• Repackaging and Relubrication or Special Lubricants

• Full Application Engineering, Product Design Capabilities,

and Support

Silverthin™ is a Group of Mechatronics, Inc. 12.09.15

Web: https://www.rstbearing.com.cn

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