RNA49-28-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 RNA49-28-XL model number is decoded

envelope 32×45×17 mm: 32 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 27.5 kN and C0 33.5 kN at the 32 mm seat; the C/C0 ratio of 0.82 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 13,600 r/min and the thermal reference speed 7,600 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 0.86 kN/mm and per millimetre of width 1.62 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 73.2 g, just 0.10 g per mm² of projected 45×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 32 mm bore marks the medium range: mounting forces and fits become critical, and the 73.2 g mass calls for proper induction or press tooling rather than hand fitting Reading the RNA49 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The thin 6.5 mm section makes the 73.2 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting X-life status (-XL) indicates the current Schaeffler premium execution at 32 mm bore; the 33.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 45 mm outside diameter and 27.5 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 32 mm seat, and in motorcycle and light-vehicle transmissions the 73.2 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 17 mm width and the published 33.5 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

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