NKS75-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 NKS75-XL model number is decoded

envelope 75×95×28 mm: 75 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 81 kN and C0 123 kN at the 75 mm seat; the C/C0 ratio of 0.66 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 95 mm outside diameter the fatigue load limit Cur is 22.2 kN, the limiting speed 6,000 r/min and the thermal reference speed 3,950 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 1.08 kN/mm and per millimetre of width 2.89 kN/mm — the reason 28 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 402 g, just 0.15 g per mm² of projected 95×28 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 75 mm bore the 95 mm outside diameter and 28 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 6,000 r/min The hardness requirement is unforgiving: below about 58 HRC the 75 mm journal brinels under the 123 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 6,000 r/min limit. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 95 mm outside diameter and 81 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 75 mm seat, and in hydraulic and pneumatic pump eccentrics the 402 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 28 mm width and the published 123 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. 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

• Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.