Fafnir6310 BRAngular Contact Ball Bearing – 50 mm Bore, 110 mm OD, 1.5625 in Width, Machined Bronze Cage

Product Description

What this part is

Fafnir 6310-BR, an angular contact ball bearing with a machined bronze cage. Bore Diameter: 50 mm. Outside Diameter: 110 mm. Overall Width: 1.5625 in (39.7 mm). Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Cage Material: Bronze. Cage Type: Machined. Bearing Material: Chrome steel. Base Number: 6310.

Decoding the designation

310 — the 300 heavy dimension series, bore code 10: a 50 mm bore in a 110 mm outside diameter.

BR — machined bronze cage.

What these specs mean in practice

Cage Material: Bronze, machined rather than pressed. A machined bronze cage tolerates higher temperature and poorer lubrication than a pressed steel or polymer cage and holds ball spacing under shock, which is why it is specified on heavily loaded angular contact positions. Closure Type: Open, so the housing feeds oil or grease straight to the ball path. Precision Class: Not specified — the designation carries no tolerance suffix.

Width and envelope

The 1.5625 in (39.7 mm) width on a 50 x 110 mm envelope is the ISO 3310 double-row angular contact section, which is wider than the 27 mm single-row 6310 section on the same bore and outside diameter. Fafnir’s own number for that section is 5310. Both the stated width and the stated bearing type point to the wide section, so the shaft and housing seats are sized from 50 x 110 mm and the axial length from 39.7 mm.

Quantity and configuration

Unit Quantity: 1 Pc. One bearing.

Interchange guidance

On the 50 x 110 x 39.7 mm envelope the interchanges are SKF 3310 A, FAG 3310-B-TVH, NSK 3310B, NTN 5310, Koyo 5310 and Fafnir 5310W. A single-row 6310 shares the 50 x 110 mm bore and outside diameter at 27 mm width and is a related size, not a substitution. Searchable variants include 6310-BR, 6310BR, 6310 BR, 5310BR and 3310.