Fafnir3MM212WI DUHSuper Precision Angular Contact Ball Bearing – 60 mm ID, 110 mm OD, 22 mm Width, 25° Contact Angle, ABEC 7, Heavy Preload

Product Description

What this part is:

Fafnir 3MM212WI-DUH is a matched duplex pair (Unit Quantity: 2 Pcs) of super precision angular contact ball bearings from the Fafnir 200WI spindle series. Each bearing is 60 mm bore, 110 mm outside diameter and 22 mm wide, with a 25° contact angle, a phenolic cage and heavy preload. Made in USA.

Decoding the designation:

3MM — Fafnir super-precision spindle bearing with a 25° contact angle and P4 precision (ABEC 7).

212 — 200 dimension series, bore code 12, giving a 60 mm bore.

WI — spindle angular contact ball bearing with universally ground faces.

CR — phenolic cage riding on the outer ring land.

DU — duplex, a factory-matched set of two bearings.

H — heavy preload.

Specifications:

Bore Diameter: 60 mm (2.3622 in). Outside Diameter: 110 mm (4.3307 in). Overall Width: 22 mm (0.8661 in) per bearing. Total Width: 44 mm (1.7323 in) across the duplex pair. Contact Angle: 25°. Precision Class: ABEC 7 / P4. Preload: Heavy (H). Cage Material: Phenolic. Cage Type: Outer-land-riding. Rolling Elements: Ball. Number Of Rows: 1 per bearing. Closure Type: Open. Bore Type: Straight. Material: High carbon chrome steel. Series: 200WI. Base Number: 7212. Unit Quantity: 2 Pcs.

Dimensions and mounting:

Bore Diameter: 60 mm. Outside Diameter: 110 mm. Width: 22 mm per bearing; 44 mm for the pair. The two bearings are ground as a set and the pair carries the heavy preload as supplied.

Compatibility and replacement:

Cross-references: FAG B7212-E-T-P4S-DUH; NSK 7212A5TRDUH; SKF 7212 ACD/P4ADGB (light preload). The ISO designation is 7212 A, also written 7212-A5 in the NSK scheme. The 2MM212WI is a 15° bearing in the same envelope.

Frequently asked questions:

What are the dimensions of the Fafnir 3MM212WI-DUH?

Each bearing is 60 mm bore, 110 mm outside diameter and 22 mm wide. The duplex pair is 44 mm wide in total.

What do 3MM, WI, CR, DU and H mean in 3MM212WI-DUH?

3MM is the 25° super-precision spindle series, WI is an angular contact spindle bearing with universally ground faces, CR is a phenolic cage riding on the outer ring land, DU is a factory-matched duplex set and H is heavy preload.

How many bearings are supplied and what is the contact angle?

The set is 2 Pcs, one matched duplex pair. The contact angle is 25°.