Fafnir2MM9115WIDULAngular Contact Ball Bearing — 75 mm ID, 115 mm OD, 20 mm Width, 15° Contact Angle, Light Preload, Phenolic Cage, ABEC 7/9

Product Description

What this part is

Fafnir 2MM9115WICRDUL, a super-precision spindle angular contact ball bearing from Timken’s Fafnir 9100WI range. Bore: 75 mm. Outside Diameter: 115 mm. Bearing Width: 20 mm per bearing. Total Width: 40 mm across the set. Contact Angle: 15°. Precision Class: ABEC 7/9 (ISO P4S). Preload: light. Cage Type: CR, phenolic outer land riding. Cage Material: phenolic. Rolling Elements: steel balls. Number of Rows: 1 per bearing. Manufacturer Part Number: 2MM9115WI DUL. World Part Number: 7015C-T-P4S-DUL.

Decoding the designation

2MM — Fafnir super-precision spindle execution at a 15° contact angle, ground to ABEC 7/9 (ISO P4S) tolerance.

9115 — 9100WI dimension series, bore code 15. That is the ISO 7015 envelope: 75 mm bore, 115 mm outside diameter, 20 mm width per bearing.

WI — low shoulder on both rings, which is what allows the ball complement and the 15° angle to be ground into this section.

CR — phenolic outer land riding cage, guided on the outer ring lands.

DUL — duplex, light preload. Two universally ground bearings supplied as a matched set, faces flush-ground so they close to the same preload when clamped.

What these specs mean in practice

Dynamic Radial Load Rating (C1): 51,600 N (11,600 lbf) per bearing. Dynamic Radial Load Rating, ISO method (C1 per row): 46,800 N (10,500 lbf). Static Radial Load Rating (C0): 43,500 N (9,790 lbf) per bearing. Limiting Speed, grease: 11,000 rpm. Limiting Speed, oil: 22,000 rpm.

The 9100 extra-light section keeps the outside diameter down to 115 mm on a 75 mm bore, which is what lets it turn at 11,000 rpm on grease. The 15° contact angle holds the load path close to radial and keeps that speed limit high. The phenolic outer land riding cage is light, so it adds little to ball-set inertia, and the resin holds oil in its own porosity to feed the ball pockets. Light preload fixes the spindle stiffness while keeping running temperature down.

Quantity and configuration

Unit Quantity: 2 Pcs. A matched duplex set of two universally ground bearings, 40 mm total width when clamped together.

Mounting data

Shaft Backing Shoulder Diameter: 82.7 mm (3.260 in). Housing Backing Shoulder Diameter: 107.3 mm (4.230 in). Maximum Shaft Fillet Radius: 1 mm (0.039 in). Outer Ring To-Clear Radius: 1 mm (0.039 in).

Interchange guidance

Timken’s world part number for this set is 7015C-T-P4S-DUL. Searchable variants of the Fafnir number: 2MM9115WI-DUL, 2MM9115WICRDUL, 2MM-9115-WI-CR-DUL, 2MM 9115 WI CR DUL, 7015C, 7015.

The 3MM9115WI on the same 75 x 115 x 20 mm envelope is the 25° build: more thrust capacity, lower speed.