NK30-20-TV-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 NK30-20-TV-XL model number is decoded

envelope 30×40×20 mm: 30 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 28 kN and C0 41 kN at the 30 mm seat; the C/C0 ratio of 0.68 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 40 mm outside diameter the fatigue load limit Cur is 7.3 kN, the limiting speed 14,800 r/min and the thermal reference speed 8,500 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 0.93 kN/mm and per millimetre of width 1.40 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 61 g, just 0.08 g per mm² of projected 40×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 30 mm bore this size balances the 40 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range With Cur 7.3 kN and a 14,800 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 28 kN C rating and longer nominal life come without an envelope change. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 14,800 r/min. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 40 mm outside diameter and 28 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 30 mm seat, and in textile machine heald and cam shafts the 61 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 20 mm width and the published 41 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. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.

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.
• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.