NK10-12-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 NK10-12-TV-XL model number is decoded

envelope 10×17×12 mm: 10 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 5.3 kN and C0 5.5 kN at the 10 mm seat; the C/C0 ratio of 0.96 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 17 mm outside diameter the fatigue load limit Cur is 0.94 kN, the limiting speed 29,500 r/min and the thermal reference speed 29,000 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 0.53 kN/mm and per millimetre of width 0.44 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 10.1 g, just 0.05 g per mm² of projected 17×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 10 mm bore sits in the miniature band; at 12 mm wide the NK10/12-TV-XL is built into compact cam drives, indexing pawls and light linkages Omitting the inner ring frees radial space — at a 10 mm shaft the outer diameter is only 17 mm and the width 12 mm, yet C is 5.3 kN The hardness requirement is unforgiving: below about 58 HRC the 10 mm journal brinels under the 5.5 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 29,500 r/min limit. With the -TV polyamide cage the rollers are positively separated, so the 10 mm bearing suits continuous rotation rather than the slow oscillating duty where cageless packs are chosen. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 17 mm outside diameter and 5.3 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 10 mm seat, and in hydraulic and pneumatic pump eccentrics the 10.1 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 12 mm width and the published 5.5 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. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.

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.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.