NK50-35-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 NK50-35-TV-XL model number is decoded

envelope 50×62×35 mm: 50 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 67 kN and C0 132 kN at the 50 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 24.3 kN, the limiting speed 9,200 r/min and the thermal reference speed 5,200 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 1.34 kN/mm and per millimetre of width 1.91 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 207 g, just 0.10 g per mm² of projected 62×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 50 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 35 mm width as a standard mounting space This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces With Cur 24.3 kN and a 9,200 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 67 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 9,200 r/min. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 62 mm outside diameter and 67 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 50 mm seat, and in motorcycle and light-vehicle transmissions the 207 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 35 mm width and the published 132 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. 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.

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.
• 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.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.