NTNDouble-Row Spherical Roller Bearing 90 x 160 x 40 mm, 1:12 Tapered Bore, W33 Lubrication Groove and Three Holes, 1 Pc

Product Description

What this part is

NTN 22218BKD1 double-row spherical roller bearing. Bore: 90 mm, tapered 1:12. Outside Diameter: 160 mm. Overall Width: 40 mm. Number Of Rows: 2. Rolling Elements: Barrel (spherical) rollers. Cage Type: Centre-guided cage, NTN B internal design. Closure Type: Open both sides. Internal Clearance: CN (normal). Bearing Material: Through-hardened bearing steel. Item Weight: approximately 3.18 kg. Permissible Static Misalignment: approximately 1.5°. Series: 222. Two rows of barrel-shaped rollers run on a single spherical raceway ground into the outer ring, so the inner ring, rollers and cage swivel as an assembly relative to the housing.

Decoding the designation

Part Number: 22218BKD1. 222 is the ISO double-row spherical roller series, the narrower of the two common 90 mm bore options. 18 is the bore size code: 18 x 5 = 90 mm. B is the NTN internal design, a one-piece ribbed inner ring with asymmetrical rollers and a centre-guided cage. K is the 1:12 tapered bore. D1 is NTN’s code for the lubrication feature published elsewhere as W33: an annular groove around the outer ring with three radial feed holes through it.

What these specs mean in practice

The 1:12 tapered bore is a clearance-setting device. As the bearing is driven up the taper the inner ring expands and the internal radial clearance closes by a known amount, so clearance is set by measured drive-up. That is why tapered-bore spherical rollers are standard on long plain shafts and on shafts carrying several bearings. The W33 groove and its three holes take lubricant into the bearing at the centre of the outer ring, between the two roller rows, so fresh grease or oil moves outward through both rows. Harmonization Code: 8482.30.0000. Main dimensions follow DIN 635-2 / ISO 15.

Quantity and configuration

Unit Quantity: 1 Pc. The complete bearing: inner ring, both roller rows, both cages, guide ring and outer ring. Locking Method: mounts on an H318 adapter sleeve on a plain shaft, or an AHX318 withdrawal sleeve on a stepped seat.

Interchange guidance

Direct tapered-bore interchanges on this envelope: SKF 22218 EK and 22218 CCK/W33, FAG 22218-E1-XL-K, Timken 22218KEJW33, NSK 22218EAKE4, Koyo 22218RHRK. ISO base number: 22218K. The 22218CJ and 22218C/W33 numbers carried in this listing are the plain-bore counterparts on the same 90 x 160 x 40 envelope — a related size with a cylindrical bore. The 23218 is a related size as well: same 90 mm bore and 160 mm outside diameter in a 52.4 mm wide, higher-capacity bearing. Manufacturer status: the NTN B internal design is superseded by the NTN ULTAGE EA/EM series.