Fafnir2MM9512WI CR DULAngular Contact Ball Bearing – 60 mm ID, 100 mm OD, 21 mm Width, 15° Contact Angle, Light Preload Duplex Pair, ABEC 7/9

Product Description

What this part is:

Fafnir 2MM9512WI-CR-DUL super-precision angular contact ball bearing, 9500WI spindle series, 60 x 100 x 21 mm. Bore Diameter: 60 mm. Outside Diameter: 100 mm. Overall Width: 21 mm per bearing. Contact Angle: 15°. Precision Class: ABEC 7/9 / P4S. Cage Type: Outer-ring land riding. Cage Material: Phenolic. Rolling Elements: Ball. Bearing Material: Chrome steel. Bore Type: Straight. Closure Type: Open. Number Of Rows: 1 per bearing.

Decoding the designation:

2 — 15° contact angle.

MM — Fafnir super-precision spindle execution, ISO P4S tolerance class.

9512 — 9500WI metric spindle series, bore code 12, giving a 60 mm bore.

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

CR — phenolic outer land riding cage.

DUL — duplex pair, light preload.

What these specs mean in practice:

Lubricant: grease or oil.

A 15° contact angle favours rotational speed over thrust capacity, which is why this angle dominates high-speed machine tool spindle positions. Light preload keeps running heat and friction torque down while still removing internal play, and it is the grade chosen where spindle speed matters more than stiffness. Preload and internal clearance are mutually exclusive, so Internal Clearance: N/A.

The cage is guided on the outer ring land rather than on the balls, which steadies it at high speed. Phenolic absorbs and releases lubricant, suiting continuous spindle duty.

Quantity and configuration:

Unit Quantity: 2 Pcs. Mounting Arrangement: duplex pair, light preload. The two bearings are ground as a matched set and mount together on one shaft seat.

Cross-reference guidance:

The 9500WI series runs on its own envelope rather than an ISO 70xx or 719xx size, so this bearing is identified by the Fafnir number. Searchable forms include 2MM9512WICRDUL, 2MM9512WI-CR-DUL, 2MM-9512-WI-CR-DUL and 2 MM 9512 WI CR DUL.