NA6919-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 NA6919-ZW-XL model number is decoded

envelope 95×130×63 mm: 95 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 197 kN and C0 440 kN at the 95 mm seat; the C/C0 ratio of 0.45 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 130 mm outside diameter the fatigue load limit Cur is 77 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,440 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 2.07 kN/mm and per millimetre of width 3.13 kN/mm — the reason 63 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.5 kg (2500 g), just 0.31 g per mm² of projected 130×63 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 95 mm bore this is a heavy-industrial bearing: 2.5 kg of stiff ring and roller set, specified where rigidity matters more than speed The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 440 kN C0 rating still assumes full rigid support under both rings Cur 77 kN, limiting speed 4,200 r/min, reference speed 2,440 r/min — the inner ring adds a few grams (total 2500 g) but removes the hardening requirement As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 77 kN Cur value. -ZW is the double-row needle-cage code; the two rows run on the same races and keep the unit separable and interchangeable with the single-row mounting space. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 130 mm outside diameter and 197 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 95 mm seat, and in rocker arms and valve trains the 2.5 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearings, relying on the 63 mm width and the published 440 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. 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

• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• 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.