Fafnir3MM307WI CR DUHSuper Precision Angular Contact Ball Bearing – 35 mm ID, 80 mm OD, 21 mm Width, 25° Contact Angle, ABEC 7, Heavy Preload

Product Description

What this part is:

Fafnir 3MM307WI-DUH is a matched duplex pair (Unit Quantity: 2 Pcs) of super precision spindle angular contact ball bearings in the 73-series envelope. Each bearing is 35 mm bore, 80 mm outside diameter and 21 mm wide, with a 25° contact angle, a phenolic outer-land-riding cage and heavy preload.

Decoding the designation:

3MM — Fafnir super-precision spindle series with a 25° contact angle and P4 precision (ABEC 7); 2MM is the 15° series.

307 — 73-series bore code for a 35 mm bore in the 80 mm outside diameter envelope.

WI — non-separable angular contact geometry with full inner ring shoulders and a low outer ring shoulder, carrying thrust in one direction.

CR — phenolic composition cage riding on the outer ring land.

DUH — flush-ground duplex pair at heavy preload; the series runs DUX extra-light, DUL light, DUM medium and DUH heavy.

Specifications:

Bore Diameter: 35 mm. Outside Diameter: 80 mm. Overall Width: 21 mm per bearing. Total Width: 42 mm for the assembled pair. Contact Angle: 25°. Precision Class: ABEC 7 / P4. Dynamic Load Rating: 44,500 N (10,000 lbf). Static Load Rating: 24,700 N (5,600 lbf). Rolling Elements: 10 steel balls, 14.29 mm diameter. Preload: Heavy (H), 1,560 N. Limiting Speed: 17,300 rpm single bearing; DUH pair mounted back-to-back, 6,930 rpm grease and 11,790 rpm oil. Cage Material: Phenolic. Cage Type: Outer-land-riding. Closure Type: Open. Bore Type: Straight. Number Of Rows: 1 per bearing. Lubricant: Grease or oil. Series: MM 300 (73-series envelope). Unit Quantity: 2 Pcs.

Dimensions and mounting:

Bore Diameter: 35 mm. Outside Diameter: 80 mm. Width: 21 mm per bearing; 42 mm for the assembled pair. Mounting Arrangement: universal, back-to-back, face-to-face or tandem. Preload Force (DUH): 1,560 N.

Compatibility and replacement:

Cross-reference: FAG B7307-E-T-P4S-DUH. The ISO designation is 7307E-T-P4S-DUH. Fafnir 2MM307WI CR DUH shares the 35 x 80 x 21 mm envelope with a 15° contact angle. Fafnir spindle bearings are now sold under the Timken brand.

Frequently asked questions:

What are the dimensions of the Fafnir 3MM307WI-DUH?

Each bearing is 35 mm bore, 80 mm outside diameter and 21 mm wide. The assembled duplex pair is 42 mm wide.

What do 3MM, WI, CR and DUH mean in 3MM307WI-DUH?

3MM is the 25° super-precision spindle series, WI is non-separable angular contact geometry, CR is a phenolic cage riding on the outer ring land and DUH is a flush-ground duplex pair at heavy preload.

What are the load ratings and preload?

Dynamic load rating is 44,500 N and static load rating is 24,700 N. Heavy preload force is 1,560 N. The set is 2 Pcs, one matched duplex pair.