Fafnir2MM9103WIMBRAngular Contact Ball Bearing – Straight Bore, 17 mm ID, 35 mm OD, 10 mm Width, Open, 15° Contact Angle.

Product Description

What this part is

Fafnir 2MM9103WIMBR super-precision angular contact spindle ball bearing, built by The Timken Company. Series: 9100WI. Bore: 17 mm. Outside Diameter: 35 mm. Bearing Width: 10 mm. Contact Angle: 15°. Precision Rating: ISO P4S (ABEC 7/9). Cage Type: Machined, outer-ring land riding. Cage Material: Bronze. Rolling Elements: steel balls. Bore Type: Straight. Closure Type: Open. Number Of Rows: 1. Design Units: Metric. The ISO equivalent envelope is 7003C.

Decoding the designation

The 2MM prefix gives a 15° contact angle and ISO P4S accuracy. 9103 in the 9100WI series is the ISO 7003 envelope. WI denotes a low shoulder on both rings. MBR is the machined bronze cage, which is the alternative to the phenolic CR cage in this range.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity. A machined bronze cage tolerates higher temperature and marginal lubrication than a phenolic cage, and holds its form under shock loading, which is why it is specified where a spindle sees interrupted cuts or hot running.

Quantity and configuration

Unit Quantity: 4 Pcs. Arrangement / Configuration: Single. The listing carries four individual bearings of the same designation.

Mounting data

Max Shaft Fillet Radius: 0.3 mm (0.012 in). Outer Ring To Clear Radius: 0.3 mm (0.012 in). Shaft Backing Shoulder Diameter: 21.5 mm (0.850 in). Housing Backing Shoulder Diameter: 31.1 mm (1.230 in).

Interchange guidance

Cross-references: 7003C-T-P4S, SKF 7003 CD/P4A, FAG B7003-C-T-P4S, NSK 7003CTYNP4. Searchable forms of the designation: 2MM9103WIMBR, 2MM9103WI-MBR, 2MM 9103 WI MBR, 7003C.