Fafnir2MM9110WI CR DUHSuper-Precision Angular Contact Ball Bearing – 50 mm Bore, 80 mm OD, 16 mm Width, 15° Contact Angle, Open, Phenolic Machined Cage, Heavy Preload, Duplex Ground

Product Description

What this part is

Fafnir 2MM9110WI-CR-DUH super-precision angular contact ball bearing, 50 mm bore, 80 mm outside diameter, 16 mm width. Single row, open on both faces, machined phenolic outer-land-riding cage. ISO base number 7010. Supplied sealed in the factory bag.

Decoding the designation

2MM sets a 15° contact angle in the Fafnir WI super-precision scheme, and the MM prefix carries P4S precision — ABEC 7 dimensional tolerances with ABEC 9 running accuracy. The leading 9 of 9110 places the bearing in the ISO 70 light dimension series, so the ISO base number is 7010. WI is the ground spindle-bearing execution, CR the phenolic outer-land-riding cage, and DUH a duplex arrangement at heavy preload.

What these specs mean in practice

Basic dynamic capacity is 27.9 kN and static capacity 20.8 kN, with a limiting speed of 16,300 rpm — a fast bearing for its size, which is what the 15° angle and the light phenolic cage buy. A 25° bearing in the same envelope would carry more thrust and turn slower. Heavy preload maximises axial and radial stiffness and holds spindle position under load, at the cost of higher running temperature and a lower practical speed ceiling than the light setting.

Quantity and configuration

Universally ground duplex execution, so the bearing stacks with another of the same designation back-to-back, face-to-face or in tandem, with the heavy preload developed by the ground face offsets.

Fitting notes

Straight bore on an interference fit to the spindle journal, outer ring clamped square in the housing bore. Marked faces are oriented together per the chosen duplex arrangement. The bearing arrives with an oil preservative coating; operating range is –30 to 120 °C on oil or grease.

Interchange guidance

Same-specification 15° super-precision duplex equivalents include the SKF 7010 CD/P4ADGC, FAG B7010-C-T-P4S-DUH and NSK 7010CTYNDUHP4. A 3MM9110WI of the same envelope is a 25° bearing and a related size rather than a substitution.