NK7-12-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 NK7-12-TV-XL model number is decoded

envelope 7×14×12 mm: 7 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 4.15 kN and C0 3.6 kN at the 7 mm seat; the C/C0 ratio of 1.15 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 14 mm outside diameter the fatigue load limit Cur is 0.61 kN, the limiting speed 34,500 r/min and the thermal reference speed 42,000 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 0.59 kN/mm and per millimetre of width 0.35 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 8.2 g, just 0.05 g per mm² of projected 14×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 7 mm bore and only 8.2 g: the smallest sizes demand accurate shaft geometry, because the 3.5 mm section leaves no tolerance for a soft or tapered seat Omitting the inner ring frees radial space — at a 7 mm shaft the outer diameter is only 14 mm and the width 12 mm, yet C is 4.15 kN With Cur 0.61 kN and a 34,500 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins X-life status (-XL) indicates the current Schaeffler premium execution at 7 mm bore; the 3.6 kN C0 rating reflects the improved rolling-contact geometry. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 14 mm outside diameter and 4.15 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 7 mm seat, and in connecting-rod small ends the 8.2 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 12 mm width and the published 3.6 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

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