NTN22218BD1Double-Row Spherical Roller Bearing 90x160x40 mm, Straight Cylindrical Bore, Outer Ring Oil Groove and Inlet Holes for Relubrication

Product Description

What this part is

An NTN double-row spherical roller bearing, 90 mm bore × 160 mm outside diameter × 40 mm width, with a straight cylindrical bore and an outer ring drilled and grooved for lubrication. Spherical roller bearings take very heavy radial load while tolerating shaft misalignment and deflection, which is why they are the default choice for conveyor pulleys, fans, crushers, screens, mill shafts and gearbox output positions.

Decoding the designation

222 — double-row spherical roller bearing, 22-dimension series.
18 — bore code, 90 mm.
B — NTN’s internal design code for this bearing, from the generation preceding NTN’s current ULTAGE EA and EM designs.
D1 — outer ring with oil inlet holes and an annular oil groove. NTN’s own literature defines this code specifically, and it is standard on the ULTAGE range while being an add-on code on earlier designs.
No K — the bore is cylindrical, not tapered. The bearing mounts directly onto a plain interference-fit shaft seat, with no adapter sleeve required. Its tapered-bore sibling would carry a K, and the two are not interchangeable.

D1 and W33 are not the same code

The original listing carried both D1 and W33 as though they were interchangeable ways of saying the same thing. NTN itself distinguishes them, and the distinction is worth knowing when cross-shopping. Both describe an outer ring with a lubrication groove and inlet holes, but NTN specifies W33 as the three-inlet form manufactured in Europe, while D1 is its own designation with a different inlet count. In practice either will relubricate a bearing through the housing feed, but they are not the same part number and a purchasing system that treats them as identical will occasionally deliver a surprise.

Whichever form you have, the practical point is the same: align the groove and holes with the housing lubrication port on assembly. A grooved outer ring rotated so the port sits against a housing land is no better than an ungrooved bearing, and this is a common assembly error. Where it is aligned correctly, fresh grease or oil reaches the rollers directly rather than having to migrate in from the ring faces, which is a real advantage in dirty or high-duty service.

Published ratings and mounting data

Load ratings and limiting speeds are not published on this listing, and the reason is specific rather than a shrug. NTN’s current spherical roller catalogue covers only the ULTAGE EA and EM designs, so it contains no row for the older B-type internal design. Figures for a 22218B appear only in NTN’s legacy US catalogue, whose surviving copies are hosted by third parties with ambiguous row alignment — and a mis-aligned table is exactly how wrong ratings get into circulation.

What must not happen, and has not happened here, is substituting the current 22218EAD1 figures. NTN publishes that bearing at Cr 384 kN and Cor 398 kN with speeds of 3,200 and 4,000 rpm, but EA is a different, higher-capacity internal design. Applying those numbers to a B-type would overstate its capacity and any life calculation built on them would be wrong. If certified ratings are needed for this designation, request the legacy NTN data sheet.

Confirmed geometry: 90 mm bore, 160 mm outside diameter, 40 mm width, straight bore, double row.

Fitting notes

A 90 mm straight-bore bearing on an interference fit should be mounted with an induction heater or an oil bath rather than driven on. Impact loads passed through the rollers from one ring to the other cause brinelling that stays invisible until the bearing is running and then shortens its life dramatically. Do not heat a bearing above roughly 120 °C. Check the shaft seat and housing bore for size and burrs before assembly, and align the oil groove with the housing feed port.

Interchange guidance

The 22218 base number and the 90 × 160 × 40 envelope are ISO standard, so the envelope is served by every major maker: SKF 22218 E, FAG 22218-E1-XL, NSK 22218EAE4 and Timken 22218 among them. The designation 22218CJ also appears against this part as a cross-reference. Two cautions when cross-shopping. First, internal design codes are not equivalent to each other — NTN B, NTN EA, SKF E, FAG E1-XL and NSK EA each denote that maker’s own design, with different roller complements, cage materials and therefore different ratings. Second, decide whether you need the lubrication groove before substituting, since the plain version of any of these is a different part number. NTN remains the current source, and its modern equivalent in this size is the ULTAGE 22218EAD1.

Central Surplus also holds a FAG bearing in this identical 90 × 160 × 40 envelope, which is worth comparing if the NTN design code is not critical to your application.