Product Description
What this part is
SKF 1311 double-row self-aligning ball bearing with a straight bore. Bore Diameter: 55 mm. Outside Diameter: 120 mm. Overall Width: 29 mm.
Decoding the designation
1311 — ISO self-aligning ball bearing, 13 series, bore code 11: 55 mm bore, 120 mm outside diameter, 29 mm width. No suffix: straight bore, normal clearance.
What these specs mean in practice
Rolling Elements: Ball. Number Of Rows: 2. Both ball rows run in a common spherical outer raceway, so the bearing self-aligns to shaft deflection and housing misalignment. Internal Clearance: CN, normal radial clearance. Closure Type: Open. Bore Type: Straight, for a cylindrical shaft seat.
Quantity and configuration
Unit Quantity: 1 Pc. One complete bearing: inner ring, two ball rows with cage, and outer ring. New old stock, open box, with surface rust shown in the photographs.
Interchange guidance
Cross-references on the ISO 1311 envelope, straight bore, normal clearance: FAG 1311, NSK 1311, NTN 1311, Koyo 1311, Timken 1311, SNR 1311.