RollwayDouble-Row Spherical Roller Bearing 85x150x36 mm Tapered Bore 1:12 Machined Brass Cage W33 Relubrication Self-Aligning

Product Description

What this part is

A double-row spherical roller bearing in the ISO 222-series, 85 mm bore x 150 mm outside diameter x 36 mm width, with a 1:12 tapered bore, a machined brass cage and a W33 relubrication groove in the outer ring. Two rows of barrel rollers share a single spherical raceway ground into the outer ring, so the inner ring and roller set can swivel inside the outer ring by a couple of degrees. That is the reason this bearing type exists: shafts deflect under load and housing bores are never perfectly coaxial, and a spherical roller follows that misalignment instead of resisting it. A cylindrical roller in the same seat would take the same misalignment as edge loading on the roller ends and spall out well before its calculated life.

Decoding the designation

222 — ISO double-row spherical roller bearing, dimension series 22.

17 — bore code, 17 x 5 = 85 mm bore.

K — tapered bore, 1:12 taper.

MB — machined brass / bronze cage, inner-ring (bore) guided. This is standard Rollway and RHP usage.

W33 — annular groove around the outer ring plus three radial lubrication holes into the raceway.

GMEX — Rollway’s related in-house code for a machined brass cage guided by the rollers between two inner-ring flanges. Rollway parts in this envelope turn up under both MB and GMEX cage designations.

Tapered bore — you will also need an adapter sleeve:
A 1:12 tapered bore will not slide onto a plain straight 85 mm shaft. You need either a shaft machined with a matching 1:12 taper seat, or an adapter sleeve. For a 22217 K the matching sleeve is an H 317, which brings the mounting diameter down to a 75 mm straight shaft; HE 317 is the variant for shaft-diameter-equal fits, and withdrawal is handled by the AH / AHX series. The taper gives a true interference fit anywhere along a plain shaft with no shoulder machining, and sleeve drive-up distance is the method of setting radial internal clearance. That is why tapered-bore spherical rollers dominate plummer-block and pillow-block practice.

Why a machined brass cage is a real selling spec:
A machined brass or bronze cage is not just a costlier version of a pressed-steel one. It is stiffer, it tolerates higher operating temperatures, and it survives shock reversal and heavy vibration that will crack or fret a pressed-steel cage. It also handles marginal or intermittent lubrication better, because brass running against steel is far more forgiving than steel on steel when the film breaks down. That combination is why brass-caged spherical rollers are the default in crushers, vibrating screens, mill drives and other high-shock duty. Substituting down to a pressed-steel cage in that kind of service is a downgrade — the cage is usually the part that fails first.

Why W33 relubrication matters

The W33 groove and its three feed holes let fresh grease reach the outer raceway directly, so the bearing can be regreased on schedule without disassembling the housing. On any sealed-for-life bearing the grease life is the bearing life. In hot, dirty, wet or continuous-duty service, sealed-for-life is simply not achievable, and the ability to purge contaminated grease and replace it is the difference between a five-minute planned relube and a bearing change. A housing with a grease fitting feeding the outer-ring seat requires the W33 feature; a non-W33 bearing in that housing will not accept the grease at all.

Mounting data

The 85 x 150 x 36 mm boundary dimensions and the 2.0 mm minimum corner radius are fixed by ISO 15 and hold for any maker’s 22217.

Quantity and configuration

Sold individually. Adapter sleeve is not included — order an H 317 separately unless your shaft already carries a 1:12 taper seat.

Interchange guidance

Rollway is now part of Regal Rexnord, which is the trail to follow for current supply of Rollway-marked parts. Same-envelope 85x150x36 tapered-bore W33 double-row spherical rollers include SKF 22217 CCK/W33 and 22217 EK/W33, NSK 22217 EAKE4 and 22217 CAMKE4, FAG 22217-E1-K, NTN 22217 EAKD1, and Timken / Torrington 22217 KEJW33. Cage material, internal design and clearance class differ across these — if the original was a machined brass cage, match it. MRC part numbers cross into SKF; Torrington crosses into Timken.