NK6-10-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 NK6-10-TV-XL model number is decoded

envelope 6×12×10 mm: 6 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.0 mm radial section packed with small-diameter needle rollers C is 2.95 kN and C0 2.28 kN at the 6 mm seat; the C/C0 ratio of 1.29 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 12 mm outside diameter the fatigue load limit Cur is 0.36 kN, the limiting speed 36,500 r/min and the thermal reference speed 48,500 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 0.49 kN/mm and per millimetre of width 0.30 kN/mm — the reason 10 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 4.7 g, just 0.04 g per mm² of projected 12×10 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 6 mm bore and only 4.7 g: the smallest sizes demand accurate shaft geometry, because the 3.0 mm section leaves no tolerance for a soft or tapered seat The hardness requirement is unforgiving: below about 58 HRC the 6 mm journal brinels under the 2.28 kN static rating, and roughness above raceway finish accelerates roller wear Omitting the inner ring frees radial space — at a 6 mm shaft the outer diameter is only 12 mm and the width 10 mm, yet C is 2.95 kN -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 2.95 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 36,500 r/min limiting speed without roller-to-roller sliding. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 12 mm outside diameter and 2.95 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 6 mm seat, and in motorcycle and light-vehicle transmissions the 4.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 10 mm width and the published 2.28 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.