NAO50X68X20-IS1-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 NAO50X68X20-IS1-XL model number is decoded

envelope 50×68×20 mm: 50 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 9.0 mm radial section packed with small-diameter needle rollers C is 32 kN and C0 66 kN at the 50 mm seat; the C/C0 ratio of 0.48 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 10.9 kN, the limiting speed 8,500 r/min and the thermal reference speed 5,100 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 0.64 kN/mm and per millimetre of width 1.60 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 230 g, just 0.17 g per mm² of projected 68×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 50 mm bore places this bearing in the medium band, where the 68 mm envelope already carries ratings in the tens of kilonewtons The inner ring gives a 50 mm plain bore inside the 68×20 mm envelope and the flangeless pack delivers C 32 kN — a frequent choice in gear change linkages and pumps NAO marks the flangeless needle bearing with an inner ring: the separable ribless races accept pure radial load while adjacent parts handle axial location, and the shaft needs no hardening X-life status (-XL) indicates the current Schaeffler premium execution at 50 mm bore; the 66 kN C0 rating reflects the improved rolling-contact geometry. -IS1 marks the inner-ring lubrication feature: grease reaches the needle pack via the groove machined around the inner ring of the NAO50×68×20-IS1-XL. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 68 mm outside diameter and 32 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 50 mm seat, and in gearbox selector and change linkages the 230 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 20 mm width and the published 66 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. 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

• On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.