RNAO25X37X16-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 RNAO25X37X16-XL model number is decoded

envelope 25×37×16 mm: 25 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 23.5 kN and C0 27.5 kN at the 25 mm seat; the C/C0 ratio of 0.85 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 4.65 kN, the limiting speed 17,200 r/min and the thermal reference speed 10,000 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 0.94 kN/mm and per millimetre of width 1.47 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 60 g, just 0.10 g per mm² of projected 37×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 25 mm bore this size balances the 37 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range With no ribs the rollers can be arranged very freely in the 16 mm width, giving C 23.5 kN at only 37 mm outside diameter — the most compact radial unit in the HR1 needle section At 60 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts X-life status (-XL) indicates the current Schaeffler premium execution at 25 mm bore; the 27.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 37 mm outside diameter and 23.5 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 25 mm seat, and in small electric motor accessory drives the 60 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 16 mm width and the published 27.5 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. 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

• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• 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.