FAG22218EASKMW33Double-Row Spherical Roller Bearing 90x160x40 mm, Tapered Bore 1:12, Machined Brass Cage, C3 Clearance, Lubrication Groove

Product Description

What this part is

FAG 22218, a double-row spherical roller bearing in the 90 x 160 x 40 mm envelope with a 1:12 tapered bore, a machined brass cage and an annular lubrication groove in the outer ring. Brand: FAG (Schaeffler). Bearing Type: Double-row spherical roller bearing. Bore: 90 mm. Outside Diameter: 160 mm. Overall Width: 40 mm. Bore Form: Tapered 1:12. Cage Material: Machined brass. Cage Type: M, machined, outer-ring centred. Internal Clearance: C3. Closure Type: Open. Series: 222, 22 dimension series. Base Number: 22218. Design Units: Metric. Rolling Elements: Spherical barrel rollers. Bearing Material: Bearing steel. Harmonization Code: 8482.30.00.80. The FAG-published designation for this execution is 22218-E1A-XL-K-M-C3.

Published ratings

Dynamic Load Rating: 345 kN. Static Load Rating: 375 kN. Fatigue Limit Load Cu: 42.5 kN. Reference Speed: 3,400 rpm. Limiting Speed: 4,800 rpm with the machined brass cage. Item Weight: 3.20 kg. Calculation Factors: e 0.23, Y1 2.9, Y2 4.31, Y0 2.83. Operating Temperature Range: -30 °C to 200 °C. A static rating above the dynamic rating is normal for roller bearings.

Decoding the designation

222 / 18: double-row spherical roller bearing, 22 dimension series, 90 mm bore. E1: FAG’s optimised high-capacity internal design. E1A: the same design executed with a machined brass cage. XL: Schaeffler X-life quality grade. K: tapered bore, 1:12. M: machined brass cage, outer-ring centred. C3: radial internal clearance greater than normal. W33: annular lubrication groove with feed holes in the outer ring. Searchable variants of the marked number: 22218EASKMW33, 22218-EAS-K-M-W33, 22218 EAS K M W33, 22218KMW33, 22218KM, 22218K, 22218.

What these specs mean in practice

A machined brass cage tolerates higher temperature than steel or polymer and resists the shock and vibration that fatigue a pressed-steel cage in crushers and vibrating screens. It is forgiving in sliding contact against steel, so it holds up under marginal or contaminated lubrication. It is heavier, costs more, and runs a slightly lower limiting speed than a steel cage.

C3 clearance pairs with a tapered bore. Driving a bearing up an adapter sleeve consumes internal clearance as the inner ring expands, and a hot inner ring in a cooler housing consumes more in service. Too little residual clearance preloads the rollers and drives temperature up; too much narrows the load zone until rollers skid instead of rolling.

Mounting and bore form

Locking Method: adapter sleeve with nut and lockwasher, or a machined tapered shaft seat. The tapered bore mounts on a matching machined taper, or on an adapter sleeve that provides the taper and clamps to a plain shaft. The drive-up distance along the taper sets the residual internal clearance, so running clearance is set during assembly rather than by shaft tolerance. The plain shaft under a sleeve is smaller than 90 mm; 90 mm is the bearing bore.

Fitting notes

Drive-up on the adapter sleeve is measured, by the reduction in bore clearance with a feeler gauge or by axial drive-up distance, following Schaeffler’s mounting procedure. The lockwasher tab bends into a nut slot. The outer-ring lubrication groove aligns with the housing feed port. Mounting force passes through the ring being fitted, never through the rollers from one ring to the other.

Interchange guidance

The 22218 base number and the 90 x 160 x 40 mm envelope are ISO standard, so tapered-bore equivalents exist across makers: SKF 22218 EK/C3, NSK 22218EAKE4C3, NTN 22218EAKD1, Timken 22218K. Internal design codes are maker-specific. FAG E1-XL and E1A-XL, SKF E, NSK EA and NTN EA each denote that maker’s own roller complement, cage material and ratings, so cage material and clearance class match alongside the envelope. The straight-bore 22218 shares the envelope and the ratings and mounts differently.