NK110-40-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 NK110-40-XL model number is decoded

envelope 110×130×40 mm: 110 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 143 kN and C0 290 kN at the 110 mm seat; the C/C0 ratio of 0.49 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 130 mm outside diameter the fatigue load limit Cur is 51 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,750 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 1.30 kN/mm and per millimetre of width 3.58 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 830 g, just 0.16 g per mm² of projected 130×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 110 mm bore the 130 mm outside diameter and 40 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,200 r/min With Cur 51 kN and a 4,200 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The thin 10.0 mm section makes the 830 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 51 kN Cur value. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 130 mm outside diameter and 143 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 110 mm seat, and in textile machine heald and cam shafts the 830 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 40 mm width and the published 290 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. 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.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• 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.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.