Fafnir3MM9307WI CRAngular Contact Ball Bearing – Straight Bore, 35 mm ID, 55 mm OD, 10 mm Width, Open, 25° Contact Angle.

Product Description

What this part is

Fafnir 3MM9307WI-CR super-precision angular contact spindle ball bearing, built by The Timken Company. Series: 9300WI. Bore: 35 mm. Outside Diameter: 55 mm. Bearing Width: 10 mm. Total Width: 10 mm. Contact Angle: 25°. Precision Rating: ISO P4S (ABEC 7/9). Cage Type: CR – Phenolic Outer Land Riding Cage. Cage Material: Phenolic. Rolling Elements: steel balls. Bore Type: Straight. Closure Type: Open. Number Of Rows: 1. Design Units: Metric. Timken’s world part number for this bearing is 71907E-T-P4S.

Decoding the designation

The 3MM prefix gives a 25° contact angle and the MM series designation carries ISO P4S accuracy. 9307 in the 9300WI series is the ISO 71907 envelope. WI denotes a low shoulder on both rings. CR is the phenolic outer-land-riding cage.

What these specs mean in practice

Dynamic Radial Load Rating (C1): 11,600 N (2,680 lbf). C1 ISO Dynamic Radial Rating per row: 10,800 N (2,440 lbf). Static Radial Load Rating (C0): 8,530 N (1,920 lbf). Limiting Speed – Grease: 25,200 rpm. Limiting Speed – Oil: 45,800 rpm. A 25° contact angle carries more thrust and less speed than a 15° bearing of the same envelope. The phenolic outer-land-riding cage is light, runs quietly at speed and holds lubricant in the cage pockets, which is why it is the standard choice for machine-tool spindles.

Quantity and configuration

Unit Quantity: 1 Pc. Arrangement / Configuration: Single. Rows per Set: Single.

Mounting data

Max Shaft Fillet Radius: 0.6 mm (0.024 in). Outer Ring To Clear Radius: 0.6 mm (0.024 in). Shaft Backing Shoulder Diameter: 39.5 mm (1.550 in). Housing Backing Shoulder Diameter: 51.1 mm (2.010 in).

Interchange guidance

Cross-references: 71907E-T-P4S, 71907, 7907. Searchable forms of the designation: 3MM9307WICR, 3MM9307WI-CR, 3MM 9307 WI CR.