Fafnir3MM9111WI DULAngular Contact Ball Bearing – 55 mm ID, 90 mm OD, 18 mm Width, 25° Contact Angle, Light Preload, Phenolic Cage, ABEC 7/9

Product Description

What this part is:

Fafnir 3MM9111WI-DUL super-precision angular contact ball bearing, built by Timken. Bore: 55 mm. Outside Diameter: 90 mm. Bearing Width: 18 mm. Total Width: 36 mm. Contact Angle: 25°. Precision Class: ISO P4S (ABEC 7/9). Preload: Light. Cage Material: Phenolic. Cage Type: outer-ring land riding, machined. Rolling Elements: steel balls. Closure Type: Open. Series: 9100. Bore Type: Straight.

Decoding the designation:

3MM — Fafnir super-precision spindle execution at a 25° contact angle, ground to ISO P4S.

9111 — the 9100WI size series, ISO 7011 envelope, 55 x 90 x 18 mm.

WI — low shoulder on both rings.

CR — phenolic outer land riding cage.

DUL — universally ground duplex, light preload. Two single-row bearings ground as a matched set.

What these specs mean in practice:

Dynamic Radial Load Rating (C1): 35,900 N per bearing. Static Radial Load Rating (C0): 27,200 N per bearing. ISO dynamic radial rating per row: 32,600 N. Limiting Speed: 14,600 rpm on grease, 26,600 rpm on oil. Lubricant: grease or oil.

A 25° contact angle carries more thrust and gives higher axial stiffness than a 15° bearing on the same envelope. Light preload gives the highest running speed and the lowest heat generation of the three preload grades. The phenolic cage is light, tolerates high surface speed and holds oil in its fabric base.

Quantity and configuration:

Unit Quantity: 2 Pcs. Universally ground duplex pair, mountable back-to-back, face-to-face or in tandem.

Mounting data:

Shaft Backing Shoulder Diameter: 62.2 mm. Housing Backing Shoulder Diameter: 83.3 mm. Maximum Shaft Fillet Radius: 1 mm. Outer Ring To-Clear Radius: 1 mm.

Interchange guidance:

Timken world part number: 7011E-T-P4S-DUL. Manufacturing part number: 3MM9111WI DUL. The same bearing is written 3MM9111WIDUL, 3MM-9111-WI-CR-DUL and 3MM9111WICRDUL.