Fafnir2MM9512WICRDUMAngular Contact Ball Bearing – 60 mm ID, 100 mm OD, 21 mm Width, 15° Contact Angle, Medium Preload Duplex Pair, ABEC 7/9

Product Description

What this part is

Fafnir 2MM9512WI-CR-DUM 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.

DUM — duplex pair, medium 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. Medium preload sits between the light and heavy grades: more stiffness than light, lower heat generation than heavy. 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, medium 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 2MM9512WICRDUM, 2MM9512WI-CR-DUM, 2MM-9512-WI-CR-DUM and 2 MM 9512 WI CR DUM.