NK19-16-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 NK19-16-XL model number is decoded

envelope 19×27×16 mm: 19 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 14.7 kN and C0 17.4 kN at the 19 mm seat; the C/C0 ratio of 0.84 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 27 mm outside diameter the fatigue load limit Cur is 3.25 kN, the limiting speed 21,600 r/min and the thermal reference speed 13,700 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 0.77 kN/mm and per millimetre of width 0.92 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 26.1 g, just 0.06 g per mm² of projected 27×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 19 mm bore the 16 mm width and 14.7 kN C rating suit high-cycle industrial machinery rather than instrument duty Omitting the inner ring frees radial space — at a 19 mm shaft the outer diameter is only 27 mm and the width 16 mm, yet C is 14.7 kN 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 -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 14.7 kN C rating and longer nominal life come without an envelope change. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 27 mm outside diameter and 14.7 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 19 mm seat, and in gearbox selector and change linkages the 26.1 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 16 mm width and the published 17.4 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. 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

• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• 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.