Fafnir2MM9110WIDULAngular Contact Ball Bearing – 50 mm ID, 80 mm OD, 16 mm Width, Open, 15°, Light Preload, Universal Duplex Pair

Product Description

What this part is

Fafnir 2MM9110WI-DUL super-precision angular contact ball bearing, supplied as a universally ground matched duplex pair. Bore 50 mm, outside diameter 80 mm, width 16 mm per bearing, 32 mm across the pair. ISO equivalent size 7010. Fafnir is a Timken brand.

Decoding the designation

The 2MM prefix gives a 15° contact angle, and the MM series is built to P4S, equivalent to ABEC 7 dimensional tolerances with ABEC 9 running accuracy. 9110 is the Fafnir series code for the ISO 7010 size. WI is the super-precision angular contact execution. CR is the phenolic outer-land-riding cage. DUL is a duplex universal set at light preload.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness; a 25° bearing of the same size trades speed for thrust capacity. Light preload keeps friction and heat low for continuous spindle duty. Dynamic capacity is 27.9 kN and static capacity 20.8 kN, with a limiting speed of 16,300 rpm. The phenolic cage sets the upper temperature limit at 121 °C.

Quantity and configuration

Two bearings, matched as one set, 1.20 lbs per bearing. Universal grinding allows back-to-back, face-to-face or tandem arrangement, with preload established as the ground ring faces are clamped together.

Preload and clearance

Light preload, ground into the ring faces. A preloaded matched pair has no operating radial internal clearance, so clearance classes such as CN do not apply.

Fitting notes

Each outer ring carries a V mark across the outside diameter; the marks are aligned to hold the intended arrangement. Shaft and housing seats are held to precision tolerances, and both bearings are clamped as one unit against a common shoulder. Oil or light grease lubrication suits the phenolic cage.

Interchange guidance

FAG B7010-C-T-P4S-DUL is a same-specification interchange at 15°, phenolic cage, duplex universal light preload. NSK 7010CTYNDULP4 matches the size, angle and arrangement with a polyamide ball-guided cage. SKF 7010 CD/P4ADGA is the same envelope and angle as a universal matched pair at extra-light preload, so the preload class differs. 7010CCRDULP4S is the same part written in Timken’s ISO form.