MRC124RSingle-Row Angular Contact Ball Bearing – Straight Bore, 120 mm ID, 190 mm OD, 32 mm Width, Open, 15 Degree Contact Angle

Product Description

What this part is:

MRC 124R single-row angular contact ball bearing, R-type. Bore: 120 mm (4.7244 in). Outside diameter: 190 mm (7.4803 in). Width: 32 mm (1.2598 in). Open on both faces, cylindrical bore. Country of origin: United States.

Decoding the designation:

R — MRC’s R-type series: single-row angular contact ball bearings at a Contact Angle of 15°. 124 — the R-series size code, 120 mm bore. Within the R series the size code steps two units per 10 mm of bore, so 120-R is a 100 mm bore, 122-R a 110 mm bore and 124-R a 120 mm bore. Searchable forms: 124-R, 124 R, 124R.

What these specs mean in practice:

A 15° contact angle biases the ball path towards radial load and high speed, and carries thrust in one direction only, so R-type bearings are mounted in opposed pairs or against a second bearing where thrust reverses. Dynamic Load Rating: 134 kN (30,125 lbf). Static Load Rating: 140 kN (31,474 lbf). Speed rating: 3,300 rpm on grease, 4,000 rpm on oil. On this light 32 mm section the published static rating sits above the dynamic rating, which is the normal relationship for the series.

Quantity and configuration:

One piece, a single bearing rather than a matched set.

Fitting notes:

Bore form: straight cylindrical, 120 mm, for an interference fit on a plain shaft seat. Chamfer limit r: 2.0 mm (0.08 in). The high-shoulder side of the outer ring faces the thrust load; the counterbored side is the loading face.

Interchange guidance:

MRC 124RF-BKE and 124KR-BKE are the same 120 x 190 x 32 mm R-series envelope in other MRC executions, so they are related sizes. This 120 x 190 x 32 mm envelope is specific to the MRC R series and does not correspond to an ISO 60xx or 719xx size, so a metric ISO cross-reference does not apply.