B 0.2500 / D 0.6250WPB4TG Spherical Bearing (Inch)
WPB TG Wide-Race Staking-Groove Spherical Bearings Product Overview
WPB4TG is a wide-series PTFE-lined spherical bearing with staking groove, bore (B) = 0.2500″, OD (D) = 0.6250″. Body width (W) = 0.437″, inner race width (T) = 0.327″. Ball diameter = 0.531″. Flat OD (O) = 0.300″. Approximate weight: 0.031 lb.
Rated at 5,500 lb static radial load with ±15.0° misalignment angle. The staking groove on the OD allows the bearing to be permanently retained in a housing bore by staking the housing material into the groove — eliminating the need for snap rings or press-fit retention in many assemblies. The 52100 bearing steel ball is precision ground, heat treated, and hard chrome plated. The alloy steel race is heat treated, oil coated, and PTFE lined for self-lubricating operation.
Stainless race + stainless ball: add ‘-SS’ suffix (e.g., WPB4TG-SS). Stainless race + steel ball: add ‘-S’ suffix (e.g., WPB4TG-S). Non-groove variant: WPB4T (WPB-T series). Standard-width Teflon-lined equivalent: COM-T series.
WPB TG Wide-Race Staking-Groove Spherical Bearings Series — Full Size Range
All available sizes in the WPB TG Wide-Race Staking-Groove Spherical Bearings series. Can’t find your size? Contact us for custom dimensions.
| STAKING GROOVE PART NO. | B DIA. +0.0000 -0.0005 | D DIA. +0.0000 -0.0005 | W WIDTH +0.000 -0.002 | T WIDTH +0.005 -0.005 | O FLAT DIA. REF. | P +0.000 -0.015 | R +0.002 -0.005 | S MIN. | G +0.000 -0.01 | BALL DIA. REF | a° MIS. ANGLE REF. | STATIC RADIAL LOAD (LBS) | APPROX WEIGHT (LBS) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WPB4TG | 0.2500 | 0.6250 | 0.437 | 0.327 | 0.300 | 0.030 | 0.010 | 0.010 | 0.565 | 0.531 | 15.0 | 5,500 | 0.031 |
| WPB5TG | 0.3125 | 0.6875 | 0.437 | 0.317 | 0.360 | 0.030 | 0.010 | 0.010 | 0.627 | 0.593 | 14.0 | 9,400 | 0.035 |
| WPB6TG | 0.3750 | 0.8125 | 0.500 | 0.406 | 0.466 | 0.040 | 0.015 | 0.020 | 0.714 | 0.687 | 8.0 | 13,700 | 0.060 |
| WPB7TG | 0.4375 | 0.9375 | 0.562 | 0.442 | 0.537 | 0.040 | 0.015 | 0.020 | 0.839 | 0.781 | 10.0 | 20,700 | 0.080 |
| WPB8TG | 0.5000 | 1.0000 | 0.625 | 0.505 | 0.607 | 0.040 | 0.015 | 0.020 | 0.902 | 0.875 | 9.0 | 21,400 | 0.100 |
| WPB9TG | 0.5625 | 1.1250 | 0.687 | 0.536 | 0.721 | 0.040 | 0.015 | 0.020 | 1.027 | 1.000 | 10.0 | 26,600 | 0.135 |
| WPB10TG | 0.6250 | 1.1875 | 0.750 | 0.567 | 0.752 | 0.040 | 0.015 | 0.020 | 1.089 | 1.062 | 12.0 | 29,000 | 0.160 |
| WPB12TG | 0.7500 | 1.3750 | 0.875 | 0.630 | 0.845 | 0.060 | 0.015 | 0.020 | 1.253 | 1.250 | 13.0 | 37,000 | 0.240 |
| WPB14TG | 0.8750 | 1.6250 | 0.875 | 0.755 | 0.995 | 0.060 | 0.015 | 0.020 | 1.503 | 1.375 | 6.0 | 65,200 | 0.350 |
| WPB16TG | 1.0000 | 2.1250 | 1.375 | 1.005 | 1.269 | 0.060 | 0.015 | 0.020 | 2.003 | 1.875 | 12.0 | 104,000 | 0.970 |
Every Unit Inspected Before Shipment
Raw Material Inspection
Material certifications verified. Composition confirmed by spectrometer before machining begins.
Thread Gauge Inspection
100% go/no-go gauge check on all threaded sections. Zero tolerance on dimensional non-conformance.
Load Capacity Test
Static and dynamic load tests run on representative samples from each production batch.
Dimensional Measurement
CMM verification of critical dimensions — ball diameter, bore, thread pitch, and body length.
Surface Inspection
Visual and tactile inspection for burrs, scratches, surface cracks, and plating defects.
Articulation Test
Misalignment angle and torque measured to confirm liner performance meets specification.
Heat Treatment Verify
Hardness tests confirm proper heat treatment on chromoly steel bodies and bearing balls.
Batch Documentation
Full traceability from raw material heat number to finished part. COC and inspection reports available.
Where WPB TG Wide-Race Staking-Groove Spherical Bearings Spherical Bearings Are Used
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WPB TG Wide-Race Staking-Groove Spherical Bearings Frequently Asked Questions
What is WPB-TG used for?
WPB-TG spherical bearings are used in wide-series articulated joints and retained installations where staking groove geometry, PTFE-lined race construction, and strong radial support are required.
What is the difference between WPB-T and WPB-TG?
WPB-TG is the staking groove version of the WPB wide-series spherical bearing platform. It adds groove-related dimensions while keeping the same general PTFE-lined bearing concept.
What materials are used in WPB-TG spherical bearings?
WPB-TG uses a 52100 bearing steel ball, precision ground, heat treated, and hard chrome plated, together with an alloy steel race that is heat treated, PTFE lined, and oil coated.
Are stainless options available in WPB-TG?
Yes. Add -SS for stainless race and stainless ball, or -S for stainless race with steel ball, for example WPB12TG-SS or WPB12TG-S.
Why choose a staking groove spherical bearing?
A staking groove spherical bearing is selected when the installation requires groove-based retention in addition to wide-series load support and articulated movement.
How do I choose the right WPB-TG size?
Start with the required bore, outer diameter, widths, groove-related dimensions, misalignment angle, and static radial load shown in the size chart, then confirm whether standard, -S, or -SS configuration is the better fit for the application.