NTN21317W33C3Spherical Roller Bearing – 85 mm Bore, 180 mm OD, 41 mm Width, Straight Bore, C3 Clearance, W33 Lubrication Groove

Product Description

What this part is

NTN 21317 double-row spherical roller bearing. Bore Diameter: 85 mm. Outside Diameter: 180 mm. Overall Width: 41 mm. Bore Type: Straight. Rolling Elements: Spherical Roller. Number Of Rows: 2. Closure Type: Open. Cage Material: Machined steel. Cage Type: Machined. Internal Clearance: C3. Precision Class: RBEC 1 / P0. Series: 213. Base Number: 21317. Bearing Material: Through-hardened steel. Unit Quantity: 1 Pc.

Decoding the designation

213 — ISO dimension series 213, the narrow section of the spherical roller range, 41 mm wide on an 85 mm bore.

17 — bore code 17, giving an 85 mm bore.

W33 — annular lubrication groove in the outer ring outside diameter with three radial feed holes. NTN also writes this feature as D1.

C3 — radial internal clearance greater than normal.

What these specs mean in practice

Dynamic Load Rating: 289,000 N. Static Load Rating: 355,000 N. Limiting Speed: 2,400 rpm grease; 3,100 rpm oil. Item Weight: 5.35 kg (11.80 lb). Internal Clearance: C3. Lubricant: grease or oil.

Two rows of barrel rollers run on a common spherical raceway in the outer ring, so the inner ring can tilt relative to the housing and the bearing accommodates shaft deflection and housing misalignment without edge loading. That geometry also takes thrust in both directions alongside its radial load. C3 clearance leaves room for the interference fit and the thermal growth of a hot running shaft. The W33 groove and its three radial holes take lubricant from the housing port and distribute it around the outer ring and inward to the rollers, on grease or on circulating oil.

Mounting data

Diameter of shaft abutment da min: 99 mm. Housing abutment Da max: 166 mm. Bearing chamfer r: 3 mm. Maximum abutment fillet radius ras max: 2.5 mm. Axial load factors: e 0.25, Y1 2.69, Y2 4.00, Y0 2.63. Straight bore, so the inner ring seats directly on the shaft.

Quantity and configuration

Unit Quantity: 1 Pc. One complete double-row bearing.

Interchange guidance

Same 85 x 180 x 41 mm envelope, same straight bore, same W33 feature: SKF 21317 E/C3, FAG 21317-E1-XL-TVPB-C3, NSK 21317EAE4C3, Timken 21317EJW33C3, Koyo 21317RHW33C3, Nachi 21317EXW33C3 and SNR 21317VMC3. The 21317K executions of the same number carry a 1:12 tapered bore for an adapter sleeve — same envelope, different mounting, so a related size rather than a substitution.