NKS32-XL bearing: complete specifications & equivalents

Specification table

Source: catalog reference (HR1 2026-09-25) · extracted 2026-09-30

Parameters extracted from the official FAG Rolling Bearings catalogue (HR1 2026-09-25); FAG® is a trademark of Schaeffler Technologies AG & Co. KG, used here for identification only — mpnbase is not an authorized FAG/Schaeffler distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at schaeffler.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the NKS32-XL model number is decoded

envelope 32×47×22 mm: 32 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 38 kN and C0 43.5 kN at the 32 mm seat; the C/C0 ratio of 0.87 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 7.6 kN, the limiting speed 13,200 r/min and the thermal reference speed 8,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.19 kN/mm and per millimetre of width 1.73 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 110 g, just 0.11 g per mm² of projected 47×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 32 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22 mm width as a standard mounting space The hardness requirement is unforgiving: below about 58 HRC the 32 mm journal brinels under the 43.5 kN static rating, and roughness above raceway finish accelerates roller wear Omitting the inner ring frees radial space — at a 32 mm shaft the outer diameter is only 47 mm and the width 22 mm, yet C is 38 kN X-life status (-XL) indicates the current Schaeffler premium execution at 32 mm bore; the 43.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 47 mm outside diameter and 38 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 32 mm seat, and in motorcycle and light-vehicle transmissions the 110 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 22 mm width and the published 43.5 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.