RNAO7X14X8-TV-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 RNAO7X14X8-TV-XL model number is decoded

envelope 7×14×8 mm: 7 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 3.25 kN and C0 2.65 kN at the 7 mm seat; the C/C0 ratio of 1.23 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 14 mm outside diameter the fatigue load limit Cur is 0.42 kN, the limiting speed 34,500 r/min and the thermal reference speed 41,500 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 0.46 kN/mm and per millimetre of width 0.41 kN/mm — the reason 8 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 6 g, just 0.05 g per mm² of projected 14×8 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 7 mm bore and only 6 g: the smallest sizes demand accurate shaft geometry, because the 3.5 mm section leaves no tolerance for a soft or tapered seat Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore Flangeless races make this bearing purely radial — adjacent thrust washers or shoulders must locate the assembly axially and keep the rollers from walking off the journal As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 0.42 kN Cur value. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 34,500 r/min limiting speed without roller-to-roller sliding. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 14 mm outside diameter and 3.25 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 7 mm seat, and in textile machine heald and cam shafts the 6 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 8 mm width and the published 2.65 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. 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

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