B 20 / D 46COMA-M20(T) Spherical Bearing (Metric)
COMA M(-T) Product Overview
COMA-M20(T) is a metric spherical bearing with a 20 mm bore (B) and 46 mm OD (D). Body width (W) = 25 mm, inner race width (T) = 18.0 mm. Ball diameter = 34.93 mm. Flat OD (O) = 24.35 mm. Approximate weight: 230 g.
Rated at 260,086 lb static radial load with ±14.5° misalignment angle. The 52100 bearing steel ball is precision ground, heat treated, and hard chrome plated. The alloy steel race is oil coated and drilled/grooved for external lubrication. PTFE liner available — add ‘T’ suffix for self-lubricating variant (COMA-MT). Used in metric-dimension industrial machinery, hydraulic cylinders, agricultural equipment, and structural pivot assemblies.
PTFE-lined variant available (suffix ‘T’). Zinc plated race option available on request. Inch equivalent is the COM(-T) series. Stainless steel race options available on request.
COMA M(-T) Series — Full Size Range
All available sizes in the COMA M(-T) series. Can’t find your size? Contact us for custom dimensions.
| METRIC PART NO. | B DIA. +0.065 -0.013 | D DIA. +0.000 -0.018 | W WIDTH +0.13 -0.13 | T WIDTH +0.13 -0.13 | O FLAT DIA. REF. | M CHAMFER REF. | BALL DIA. REF. | a° MIS. ANGLE REF. | STATIC RADIAL LOAD (LBS) | APPROX WEIGHT (GRAMS) |
|---|---|---|---|---|---|---|---|---|---|---|
| COMA-M3(T) | 3 | 12 | 6 | 4.50 | 5.19 | 0.5 | 7.93 | 13.50 | - | - |
| COMA-M5(T) | 5 | 16 | 8 | 6.00 | 7.68 | 0.5 | 11.10 | 12.50 | 27,555 | 9 |
| COMA-M6(T) | 6 | 18 | 9 | 6.75 | 8.93 | 0.5 | 12.70 | 12.50 | 35,459 | 13 |
| COMA-M8(T) | 8 | 22 | 12 | 9.00 | 10.35 | 0.8 | 15.88 | 14.00 | 59,121 | 24 |
| COMA-M10(T) | 10 | 26 | 14 | 10.50 | 12.88 | 0.8 | 19.05 | 13.50 | 82,744 | 40 |
| COMA-M12(T) | 12 | 30 | 16 | 12.00 | 15.39 | 0.8 | 22.23 | 13.00 | 112,829 | 80 |
| COMA-M14(T) | 14 | 34 | 19 | 13.50 | 16.86 | 1.0 | 25.40 | 16.00 | 141,845 | 110 |
| COMA-M16(T) | 16 | 38 | 21 | 15.00 | 19.34 | 1.0 | 28.58 | 15.00 | 177,343 | 130 |
| COMA-M18(T) | 18 | 42 | 23 | 16.50 | 21.89 | 1.0 | 31.75 | 15.00 | 216,714 | 170 |
| COMA-M20(T) | 20 | 46 | 25 | 18.00 | 24.35 | 1.0 | 34.93 | 14.50 | 260,086 | 230 |
| COMA-M22(T) | 22 | 50 | 28 | 20.00 | 25.84 | 1.5 | 38.10 | 15.00 | 315,216 | 280 |
| COMA-M25(T) | 25 | 56 | 31 | 22.00 | 29.60 | 1.5 | 42.86 | 15.00 | 390,056 | 390 |
| COMA-M30(T) | 30 | 66 | 37 | 25.00 | 34.81 | 1.5 | 50.80 | 17.00 | 525,360 | 610 |
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 COMA M(-T) Rod Ends Are Used
More from the COMA M(-T) Series
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COMA M(-T) Frequently Asked Questions
What is COMA-M(T) used for?
COMA-M(T) spherical bearings are used in metric articulated joints and linkage positions where compact commercial-series geometry and reliable radial support are required.
What is the difference between COMA-M and COMA-MT?
COMA-M is the standard metric commercial metal-to-metal spherical bearing, while COMA-MT refers to the PTFE-lined option for lower-friction articulation.
What materials are used in COMA-M(T) spherical bearings?
COMA-M(T) uses a 52100 bearing steel ball, precision ground, heat treated, and hard chrome plated, together with an alloy steel race that is oil coated.
Does COMA-M(T) support lubrication?
Yes. Groove and hole are provided for the COMA series, which helps support lubricated service in applications using the metal-to-metal version.
Is a PTFE-lined metric commercial version available?
Yes. PTFE-lined versions are available in the COMA-MT series for applications that benefit from self-lubricating spherical-bearing movement.
How do I choose the right COMA-M(T) size?
Start with the required bore, outer diameter, widths, misalignment angle, and static radial load shown in the size chart, then confirm whether the standard or PTFE-lined version is the better fit for the application.