Fafnir2MM9110WI DULSuper-Precision Angular Contact Ball Bearing Duplex Pair – 50 mm ID, 80 mm OD, 16 mm Width, 32 mm Pair Width, Open, 15° Contact Angle, Light Preload, P4S

Product Description

What this part is:

Fafnir 2MM9110WI-DUL super-precision angular contact ball bearing duplex pair, built by The Timken Company. Timken world part number: 7010C-T-P4S-DUL. GTIN: 087796072428. Series: 9100WI. Bore: 50 mm. Outside Diameter: 80 mm. Bearing Width: 16 mm each. Total Width: 32 mm across the pair. Contact Angle: 15°. Precision Class: ISO P4S (ABEC 7/9). Cage Type: Outer-ring land-riding. Cage Material: Phenolic. Preload: Light. Rolling Elements: Steel balls. Rows Per Set: Duplex. Number Of Rows: 2. Closure Type: Open. Bore Type: Straight. Design Units: Metric. Bearing Material: High-carbon chrome steel. Country of Origin: United States. Condition: new old stock, original carton.

Decoding the designation:

The 2MM prefix gives Contact Angle: 15° and Precision Class: P4S — running accuracy to ABEC 9 with the remaining features held to ABEC 7. 9110 is the 9100WI extra-light spindle series at a 50 mm bore, the direct equivalent of an ISO 7010. WI marks the metric super-precision spindle range. CR is the phenolic cage riding on the outer-ring land. DU is a duplex pair, ground as a matched set so the two bearings mount together with no shim stack. L sets Preload: Light.

What these specs mean in practice:

Dynamic Radial Load Rating (C1): 27,900 N / 6,270 lbf. Dynamic Radial Load Rating, ISO per row (C1 ISO): 25,300 N / 5,670 lbf. Static Radial Load Rating (C0): 20,800 N / 4,670 lbf. Limiting Speed, grease: 16,300 rpm. Limiting Speed, oil: 32,600 rpm. Item Weight: 0.58 lb. Internal Clearance: N/A, since the set is established by preload rather than by running clearance. Light preload keeps friction torque and heat generation low, which is what supports the oil-fed 32,600 rpm figure. The 15° contact angle favours speed and radial rigidity over thrust capacity. Lubricant: grease or oil. Harmonization Code: 8482.10.50.

Quantity and configuration:

Unit Quantity: 2 Pcs. Rows Per Set: duplex. One purchase delivers a matched pair, ground so the faces stack directly and set the light preload between them. Total Width: 32 mm assembled. Mounting Arrangement: universally matchable, so the pair runs back-to-back, face-to-face or in tandem. Carton and cross designations, all recorded as search terms: 2MM9110WI-DUL, 2MM9110WIDUL, 2MM9110WICRDUL, 2MM 9110 WI CR DUL, 2MM-9110-WI-CR-DUL, 7010C-T-P4S-DUL, 7010CTDULP4.

Fitting notes:

Shaft Backing Shoulder Diameter: 56.1 mm / 2.210 in. Housing Backing Shoulder Diameter: 74.2 mm / 2.920 in. Maximum Shaft Fillet Radius: 1 mm / 0.039 in. Outer Ring To-Clear Radius: 1 mm / 0.039 in. Shoulders at those diameters bear on the ring faces clear of the cage and the ball track, and a fillet at or under 1 mm clears the ring corner. The housing bore length must accept the 32 mm assembled width.

Interchange guidance:

Closest 15° P4S duplex pairs at light preload, 50 x 80 x 16 mm: NSK 7010CTRDULP4, FAG B7010-C-T-P4S-DUL and RHP 7010CTDULP4. SKF 7010 CD/P4ADGA is the same pair at extra light preload. A 2MM9110WI-DUM is medium preload and a 2MM9110WI-DUH heavy preload. A 3MM9110WI-DUL has a 25° contact angle.