NA6915-ZW-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 NA6915-ZW-XL model number is decoded

envelope 75×105×54 mm: 75 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 147 kN and C0 275 kN at the 75 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 50 kN, the limiting speed 5,400 r/min and the thermal reference speed 3,150 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 1.96 kN/mm and per millimetre of width 2.72 kN/mm — the reason 54 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.45 kg (1450 g), just 0.26 g per mm² of projected 105×54 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 75 mm bore the 105 mm outside diameter and 54 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,400 r/min NA6915-ZW-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required Reading the NA69 prefix: machined-ring needle bearing with inner ring, two roller rows, capable of pure radial load at 147 kN C -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 147 kN C rating and longer nominal life come without an envelope change. The -ZW double-row pack explains the high C0 of 275 kN in this thin-section bearing — two rows support the static peak that a single row could not. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 105 mm outside diameter and 147 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 75 mm seat, and in two-stroke and compressor piston pins the 1.45 kg mass is part of the rotor inertia calculation. Designers also specify it for small electric motor accessory drives, relying on the 54 mm width and the published 275 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. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.

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.
• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.