FAG20315MBC3Single Row Barrel Roller Bearing 75 x 160 x 37 mm Cylindrical Bore Machined Brass Cage C3 Clearance

Product Description

What this part is

A single-row barrel roller bearing, 75 mm bore × 160 mm outside diameter × 37 mm width, with a cylindrical bore and a machined brass cage.

Decoding the designation

203 — single-row barrel roller bearing, 20300 dimension series.
15 — bore code, giving a 75 mm bore.
MB — machined brass cage.
C3 — radial internal clearance greater than normal.

What these specs mean in practice

A barrel roller runs one row of convex rollers against a concave outer raceway, which makes the bearing self-aligning and tolerant of shaft deflection and housing misalignment. That single-row geometry carries radial load only and has no axial capacity, so the axial location of the shaft is set elsewhere in the arrangement. A double-row spherical roller in a comparable envelope does take thrust in both directions, which is the practical difference between the two types.

A machined brass cage tolerates higher temperature and more shock and vibration than a pressed steel cage, and suits oil lubrication and heavier loads. C3 clearance leaves extra room for the thermal growth of an interference-fitted inner ring, so it is the usual choice where the inner ring runs hot relative to the housing.

Published specifications

Bore: 75 mm (2.9528 in)
Outside diameter: 160 mm (6.2992 in)
Width: 37 mm (1.4567 in)
Bearing type: single-row barrel roller
Rows: 1
Bore type: cylindrical
Cage: machined brass
Internal clearance: C3, greater than normal
Axial load capacity: none — radial load only
Closure: open, both faces

Quantity and configuration

Single bearing, 1 Pc. Cylindrical bore, so no adapter sleeve or withdrawal sleeve is part of the assembly.

Fitting notes

The cylindrical bore mounts directly on a ground shaft seat to an interference fit, and the outer ring seats in a housing bore sized to allow the self-aligning function to work. Because the bearing carries no thrust, the shaft is located axially by another bearing in the arrangement.

Interchange guidance

The equivalent in other schemes is the SKF 20315 M and the NSK 20315M, both single-row barrel rollers in the same envelope. The 20315-K variant has a 1:12 tapered bore and mounts on an adapter sleeve, and the 22315 is a double-row spherical roller with axial capacity — those are related sizes rather than interchanges.