Fafnir2MM202WIDULSuper-Precision Angular Contact Ball Bearing Duplex Pair – 15 mm ID, 35 mm OD, 11 mm Width, 22 mm Total, 15 Degree, Light Preload

Product Description

What this part is

Timken Fafnir 2MM202WI DUL super-precision angular contact ball bearings, supplied as a universally ground duplex pair. Each bearing is 15 mm bore, 35 mm outside diameter, 11 mm wide; the assembled pair measures 22 mm across. Open on both faces, steel balls, phenolic outer-land-riding cage.

Decoding the designation

The 2MM prefix sets a 15° contact angle, and MM denotes the P4S precision grade, equivalent to ABEC 7/9. The 200WI series is the ISO 72 medium series, so 202 gives the 7202 envelope at 15 mm bore. WI is the spindle bearing execution, CR the phenolic outer-land-riding cage, and DUL a duplex universal set at light preload. Timken publishes the world part number for this bearing as 7202C-T-P4S-DUL.

What these specs mean in practice

The pair carries a dynamic radial rating of 2,200 lbf and a static radial rating of 1,010 lbf, with an ISO per-row dynamic rating of 1,960 lbf. Limiting speed is 95,600 rpm on oil and 47,800 rpm on grease. A 15° contact angle favours speed and radial stiffness; a 25° bearing of the same envelope carries more thrust and runs slower. Light preload gives running accuracy and stiffness with the least frictional heat of the three preload grades.

Quantity and configuration

Two bearings, matched as a universally ground duplex set at light preload. Universal grinding means the pair can be assembled back-to-back, face-to-face or in tandem and will take up the specified preload without shims.

Mounting dimensions

Shaft backing shoulder diameter 0.750 in (18.9 mm) and housing backing shoulder diameter 1.230 in (31.1 mm). Maximum shaft fillet radius that the bearing corners clear is 0.024 in (0.6 mm), and the outer ring to-clear radius is the same 0.024 in.

Fitting notes

Preload on a universally ground set is established by the ground ring faces, so the running condition is defined by the mounting rather than by a clearance class. Oil lubrication suits the phenolic cage and the upper speed range.

Interchange guidance

Same-spec duplex equivalents at 15°, light preload and P4S are the FAG B7202-C-T-P4S-DUL, the NSK 7202CTYNDULP4 and the SNR 7202CVDUJ74. The SKF 7202 CD/P4ADGA is the same envelope and angle in the SKF cage and preload scheme.