Fafnir3M212WIMBRAngular Contact Ball Bearing – 60 mm ID, 110 mm OD, 22 mm Width, Open, 25° Contact Angle, Machined Bronze Cage, Duplex Matched Pair

Product Description

What this part is

Fafnir 3M212WI MBR DU angular contact ball bearing set, built by The Timken Company. Bore Diameter: 60 mm. Outside Diameter: 110 mm. Overall Width: 22 mm per bearing. Total Width: 44 mm for the pair. Contact Angle: 25°. Precision Class: ABEC 3 / P6. Mounting Arrangement: Duplex. Number Of Rows: 1 per bearing. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Cage Material: Bronze. Cage Type: Machined, outer-ring guided. Bearing Material: Chrome bearing steel. Series: 200WI. Base Number: 3M212WI. Unit Quantity: 2 Pcs.

Decoding the designation

3M — 25° contact angle in Timken’s Fafnir spindle-bearing system.

212 — 60 mm bore in the 200WI spindle series.

WI — low shoulder on both rings, the spindle-bearing ring form.

MBR — machined bronze cage.

DU — duplex set, ground as a matched pair.

7212-A — the ISO equivalent number carried on the same carton, whose A position is the 25° angle.

42D2039-1 — the customer drawing number this execution was built to.

Searchable variants: 3M212WIMBR, 3M212WI MBR, 3-M-212-WI-MBR, 3M212WIMBRDU, 7212-A, 42D2039-1.

What these specs mean in practice

A 25° contact angle sits between the shallow 15° spindle bearings and the 40° thrust types. It carries a substantially higher axial load than a 15° bearing of the same envelope while still running fast enough for spindle service, and it stiffens the shaft against combined radial and axial loading. The low shoulder on both rings is what makes the steeper angle possible on a 22 mm width. A machined bronze cage is stronger and more heat-tolerant than a pressed or polymer cage, holds its shape under high centrifugal load, and carries a lubricant film well at speed. ABEC 3 / P6 holds bore, outside diameter and running accuracy tighter than a general-purpose bearing.

Mounting data

Straight bore, so the inner rings seat on a cylindrical shaft journal. Total Width across the pair: 44 mm. The two bearings are ground as a matched set, so mounting them against their ground faces sets the pair with no shims or spacers.

Quantity and configuration

Unit Quantity: 2 Pcs. One factory duplex pair, open on all faces.

Interchange guidance

Same 60 x 110 x 22 mm envelope and same 25° angle: SKF 7212 ACCBM, NSK 7212A5, NTN 7212AD, Koyo 7212AC, RHP 7212X3 and SNR 7212HG1DU. FAG B7212-E-T-P4S-UL and Fafnir 3MM212WI-DU are the same envelope and angle in the super precision class, so each interchanges upward rather than exactly. An MRC 7212 runs a 29° angle on the same envelope and a 6212 is a Conrad-type deep groove bearing on it, which makes both related sizes rather than substitutes.