NK8-16-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 NK8-16-TV-XL model number is decoded

envelope 8×15×16 mm: 8 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 5.8 kN and C0 5.8 kN at the 8 mm seat; the C/C0 ratio of 1.00 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 15 mm outside diameter the fatigue load limit Cur is 0.99 kN, the limiting speed 32,500 r/min and the thermal reference speed 36,500 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 0.72 kN/mm and per millimetre of width 0.36 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 12 g, just 0.05 g per mm² of projected 15×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 8 mm bore and only 12 g: the smallest sizes demand accurate shaft geometry, because the 3.5 mm section leaves no tolerance for a soft or tapered seat 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 NK8/16-TV-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 5.8 kN C rating and longer nominal life come without an envelope change. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 32,500 r/min limiting speed without roller-to-roller sliding. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 15 mm outside diameter and 5.8 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 8 mm seat, and in small electric motor accessory drives the 12 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 16 mm width and the published 5.8 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. 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

• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.
• 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.