NTNSpherical Roller Bearing 75 x 130 x 31 mm, 1:12 Tapered Bore, Outer-Ring Lubrication Groove and Three Feed Holes

Product Description

What this part is

A double-row spherical roller bearing on the 22215 size — 75 mm bore, 130 mm outside diameter, 31 mm width. Two rows of barrel rollers run against one spherical raceway ground into the outer ring. Because that raceway is a section of a sphere, the whole inner assembly can tilt inside the outer ring, so the bearing tolerates shaft deflection and housing misalignment while still carrying very high radial load.

Decoding the designation

222 – ISO dimension series for spherical roller bearings.

15 – bore reference number; 15 × 5 = 75 mm bore.

B – NTN internal design code for this size range, pressed steel cage construction.

K – 1:12 tapered bore.

D1 – NTN code for the annular lubrication groove in the outer ring with three radial feed holes; this is the NTN counterpart of the W33 suffix used by SKF, FAG and Timken.

What these specs mean in practice

The tapered bore governs how this bearing is fitted and is the single most important thing to check before ordering. It will not press onto a plain cylindrical seat. Either the shaft has a matching 1:12 taper, or you mount the bearing on an adapter sleeve (H315 size for this bore) secured with a lock nut and lock washer. On a taper, drive-up distance sets the residual internal clearance, so mounting is a measured operation rather than a press-and-forget one — measure clearance reduction with a feeler gauge as you tighten.

The D1 groove feeds lubricant through the outer ring directly between the two roller rows, which is how you relubricate the bearing in service without pulling the housing apart. It needs a housing with a lube port that lines up on the groove; in a plain-bore housing the groove is simply inert.

Published ratings and mounting data

Bore: 75 mm, 1:12 taper. Outside diameter: 130 mm. Width: 31 mm. Rows: 2, barrel rollers. Basic dynamic radial load rating: approximately 167 kN for the 22215 size. Reference limiting speed: approximately 2900 rpm. Closure: open. Relubrication: annular outer-ring groove with three holes.

Quantity and configuration

Priced and supplied as one bearing. No adapter sleeve, lock nut or lock washer is included.

Interchange guidance

Other makers’ tapered-bore 22215 spherical roller bearings in the same 75 x 130 x 31 mm size: SKF 22215 EK/C3W33 and 22215 CCK/W33, FAG 22215-E1-K, NSK 22215EAKE4, Koyo 22215RHRKW33, Timken 22215KEJW33, Steyr 22215-C-K-MB-W33. Internal designs and suffixes differ, so check clearance and lubrication groove before substituting. The designations 22215C and 22215CJ are carried here as search terms; they describe straight-bore versions with the same outside diameter and width, so they are not a mounting substitute for a K bearing.