NAO30X45X17-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 NAO30X45X17-XL model number is decoded

envelope 30×45×17 mm: 30 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 23.5 kN and C0 38.5 kN at the 30 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 6.2 kN, the limiting speed 13,100 r/min and the thermal reference speed 7,100 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 0.78 kN/mm and per millimetre of width 1.38 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 102 g, just 0.13 g per mm² of projected 45×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 30 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 38.5 kN and Cur 6.2 kN for the 102 g unit Because neither ring guides axially, housing and shaft shoulders position the races; uncontrolled end float lets the rollers run off the raceway edges As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 6.2 kN Cur value. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 45 mm outside diameter and 23.5 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 30 mm seat, and in small electric motor accessory drives the 102 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 17 mm width and the published 38.5 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. 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

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