Fafnir2MM210WICRDUMSuper Precision Angular Contact Ball Bearing – 50 mm ID, 90 mm OD, 20 mm Width, Open, 15° Contact Angle, ABEC 7, Medium Preload

Product Description

What this part is:

Fafnir (now Timken) 2MM210WICRDUM super precision single-row angular contact ball bearing, 50 x 90 x 20 mm, 15° contact angle, phenolic outer-land-riding cage, ABEC 7 / P4, universally flush ground at medium preload. One bearing from a matched DUM duplex pair; the ring is etched 2MM210WI CR DUM. Unit Quantity: 1 Pc.

Decoding the designation:

2 — Timken code for a 15° contact angle, written C in ISO.

MM — super precision, ABEC 7 (ISO P4).

210 — 200 light series, bore code 10 (10 x 5 = 50 mm).

WI — angular contact with a low shoulder on the outer ring only.

CR — phenolic outer-land-riding cage, written T in ISO.

DUM — universally flush ground duplex, medium preload.

Specifications:

Bore Diameter: 50 mm (1.9685 in). Outside Diameter: 90 mm. Overall Width: 20 mm. Contact Angle: 15°. Number Of Rows: 1. Rolling Elements: 14 steel balls, 12.70 mm (1/2 in) diameter. Cage Material: Phenolic. Cage Type: Outer land riding. Preload: Medium (DUM). Precision Class: ABEC 7 / P4. Series: 200 light, ISO 7210. Closure Type: Open. Dynamic Load Rating (C): 47,400 N (10,700 lbf). Static Load Rating (C0): 31,700 N (7,130 lbf). Speed Rating (Ng): 16,000 rpm for a single grease-lubricated spring-preloaded bearing. Item Weight: 0.457 kg (1.01 lb). Preload as a matched pair: DUM 560 N (125 lbf). Back-to-back speed at medium preload: 9,600 rpm grease; 16,300 rpm oil. Stiffness at medium preload: 95.67 N/µm axial; 496.89 N/µm radial. The preload and paired-speed figures are published for a pair.

Dimensions and mounting:

Maximum Shaft Fillet Radius: 1.0 mm. Suggested Shaft Shoulder Diameter: 57.9 / 57.4 mm. Suggested Housing Shoulder Diameter: 83.3 / 82.8 mm. Grease fill: 2.15 g (10 %) to 3.20 g (15 %) at high speed; 4.80 g (25 %) to 7.60 g (40 %) at low to moderate speed. The outer ring is etched THRUST on one face; the WI construction has a low shoulder on the outer ring only, so the bearing carries thrust in one direction. Supplied in its original factory poly bag, no carton.

Compatibility and replacement:

Timken’s catalogue lists this bearing as 2MM210WI-DUM. Fafnir super precision is now Timken super precision, and the current-production part is ordered as a Timken 2MM210WICRDUM. Cross-references on the same envelope: NSK 7210CTRDUMP4, FAG B7210C.T.P4S.UM, SKF 7210 CD/P4A, NTN 7210CT1GD2GLP4. MPN variants: 2MM210WICR-DUM; 2MM210WICRDUM; 2MM-210-WI-CR-DUM; 2MM 210 WI CR DUM; 2MM210WI-DUM; 2MM210WIDUM; 2MM210WICR; 2MM210WI; 210WI.

Frequently asked questions:

What is the contact angle of the Fafnir 2MM210WICRDUM?

15°. The 2 in the designation is the Timken code for 15°.

What preload does DUM denote?

Medium preload. At this size the published matched-pair preload is 560 N for DUM.

What are the load ratings?

Dynamic Load Rating (C): 47,400 N. Static Load Rating (C0): 31,700 N.