Fafnir3MM314WICRSULAngular Contact Ball Bearing – 70 mm ID, 150 mm OD, 35 mm Width, Open, 25° Contact Angle, Light preload.

Product Description

What this part is

Fafnir 3MM314WI-SUL super-precision angular contact spindle ball bearing, built by The Timken Company. Series: 300WI. Bore: 70 mm. Outside Diameter: 150 mm. Bearing Width: 35 mm. Total Width: 35 mm. Contact Angle: 25°. Precision Rating: ISO P4S (ABEC 7/9). Preload: Light. Cage Type: CR – Phenolic Outer Land Riding Cage. Cage Material: Phenolic. Rolling Elements: steel balls. Bearing Material: chrome steel. Bore Type: Straight. Closure Type: Open. Number Of Rows: 1. Design Units: Metric.

Decoding the designation

The 3MM prefix gives a 25° contact angle and ISO P4S accuracy. 314 in the 300WI heavy series is the ISO 7314 envelope. WI denotes a low shoulder on both rings. CR is the phenolic outer-land-riding cage. SU marks a single universally ground bearing, and the trailing L sets light preload when it is mounted against a mate.

What these specs mean in practice

Dynamic Radial Load Rating (C1): 134,500 N (30,200 lbf). C1 ISO Dynamic Radial Rating per row: 122,000 N (27,500 lbf). Static Radial Load Rating (C0): 88,300 N (20,000 lbf). Limiting Speed – Grease: 8,830 rpm. Limiting Speed – Oil: 17,660 rpm. Lubricant: grease or oil. The 300 heavy series puts a larger ball complement in a thicker section than the 9100 or 200 series on the same bore, which is where the 134 kN dynamic rating comes from. A 25° contact angle carries more thrust and less speed than a 15° bearing on the same envelope.

Quantity and configuration

Unit Quantity: 1 Pc. Arrangement / Configuration: Single universally ground. Rows per Set: Single. Universal grinding means any two of these bearings mount together as a matched set in any orientation and arrive at the published light preload.

Mounting data

Max Shaft Fillet Radius: 2 mm (0.079 in). Outer Ring To Clear Radius: 2 mm (0.079 in). Shaft Backing Shoulder Diameter: 84.8 mm (3.340 in). Housing Backing Shoulder Diameter: 135.6 mm (5.340 in).

Interchange guidance

Cross-references: SKF 7314 ACDGA/P4A, FAG B7314-E-T-P4S-UL, NSK 7314A5TYNSULP4. Searchable forms of the designation: 3MM314WISUL, 3MM314WI-SUL, 3MM 314 WI CR SUL, 7314A, 7314AC.