NAO15X32X12-IS1-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 NAO15X32X12-IS1-XL model number is decoded

envelope 15×32×12 mm: 15 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 15.1 kN and C0 16.2 kN at the 15 mm seat; the C/C0 ratio of 0.93 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 32 mm outside diameter the fatigue load limit Cur is 2.9 kN, the limiting speed 20,900 r/min and the thermal reference speed 11,400 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 1.01 kN/mm and per millimetre of width 1.26 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 50 g, just 0.13 g per mm² of projected 32×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 15 mm bore the 12 mm width and 15.1 kN C rating suit high-cycle industrial machinery rather than instrument duty With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 16.2 kN and Cur 2.9 kN for the 50 g unit As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 2.9 kN Cur value. -IS1 marks the inner-ring lubrication feature: grease reaches the needle pack via the groove machined around the inner ring of the NAO15×32×12-IS1-XL. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 32 mm outside diameter and 15.1 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 15 mm seat, and in small electric motor accessory drives the 50 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 12 mm width and the published 16.2 kN static rating. 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. 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

• 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.
• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• 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.