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B 18 / D 42COMA-M18(T) is a metric spherical bearing with a 18 mm bore (B) and 42 mm OD (D). Body width (W) = 23 mm, inner race width (T) = 16.5 mm. Ball diameter = 31.75 mm. Flat OD (O) = 21.89 mm. Approximate weight: 170 g.
Rated at 216,714 lb static radial load with ±15.0° 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.
All available sizes in the COMA M(-T) Metric Alloy Steel Spherical Bearings 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 |
Material certifications verified. Composition confirmed by spectrometer before machining begins.
100% go/no-go gauge check on all threaded sections. Zero tolerance on dimensional non-conformance.
Static and dynamic load tests run on representative samples from each production batch.
CMM verification of critical dimensions — ball diameter, bore, thread pitch, and body length.
Visual and tactile inspection for burrs, scratches, surface cracks, and plating defects.
Misalignment angle and torque measured to confirm liner performance meets specification.
Hardness tests confirm proper heat treatment on chromoly steel bodies and bearing balls.
Full traceability from raw material heat number to finished part. COC and inspection reports available.
Share your part number, required quantity, and any special material or packaging requirements. We respond within 24 hours.
The COMA-M18(T) is a metric commercial-grade spherical bearing with a 18 mm bore, used in metric-dimension industrial machinery, hydraulic cylinders, agricultural equipment, and structural pivot assemblies.
Bore (B) is 18 mm, OD (D) is 42 mm, body width (W) is 23 mm, inner race width (T) is 16.50 mm, and ball diameter is 31.75 mm.
The COMA-M18(T) is rated at 216,714 lb static radial load with ±15.0° of misalignment angle.
The base COMA-M18 uses the standard grooved, oil-coated alloy steel race with lubrication holes for external grease/oil. Adding the 'T' suffix (COMA-M18T) swaps in a PTFE liner for a self-lubricating, maintenance-reduced race in the same envelope.
The ball is 52100 bearing steel, precision ground, heat treated, and hard chrome plated. The race is alloy steel, oil coated, with a zinc-plated race option and stainless steel race options both available on request.
The COMA-M18(T) is the metric member of this bearing family; the COM(-T) series is its inch-dimension equivalent, sized in fractional-inch bore rather than metric bore/OD — choose based on your unit system.
