NK9-16-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 NK9-16-TV-XL model number is decoded

envelope 9×16×16 mm: 9 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 6.6 kN and C0 7.1 kN at the 9 mm seat; the C/C0 ratio of 0.93 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 16 mm outside diameter the fatigue load limit Cur is 1.21 kN, the limiting speed 31,000 r/min and the thermal reference speed 32,000 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 0.73 kN/mm and per millimetre of width 0.41 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 12.8 g, just 0.05 g per mm² of projected 16×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 9 mm bore sits in the miniature band; at 16 mm wide the NK9/16-TV-XL is built into compact cam drives, indexing pawls and light linkages 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 The thin 3.5 mm section makes the 12.8 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 1.21 kN Cur value. 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 31,000 r/min. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 16 mm outside diameter and 6.6 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 9 mm seat, and in connecting-rod small ends the 12.8 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 16 mm width and the published 7.1 kN static rating. 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. 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

• 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.
• 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.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.