RNAO16X28X12-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 RNAO16X28X12-XL model number is decoded

envelope 16×28×12 mm: 16 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 13 kN and C0 12.5 kN at the 16 mm seat; the C/C0 ratio of 1.04 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 2.25 kN, the limiting speed 22,900 r/min and the thermal reference speed 15,900 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 0.81 kN/mm and per millimetre of width 1.08 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 32 g, just 0.10 g per mm² of projected 28×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 16 mm bore this size balances the 28 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore Cur 2.25 kN and speeds up to 22,900 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter X-life status (-XL) indicates the current Schaeffler premium execution at 16 mm bore; the 12.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 28 mm outside diameter and 13 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 16 mm seat, and in textile machine heald and cam shafts the 32 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 12 mm width and the published 12.5 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. 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.

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.
• 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.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.