NKXR35-Z bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.10 needle roller / cylindrical-needle thrust) · extracted 2026-09-26

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.10 needle roller / cylindrical-needle thrust); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.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 NKXR35-Z model number is decoded

The combined needle roller / full complement needle thrust bearings execution NKXR 35 Z measures 35×47×30 mm: radial dynamic 24.6 kN, axial dynamic 29 kN (Ca) — the thrust needle complement gives roughly twice the axial rating of a same-size thrust ball part. The code NKXR 35 Z identifies the construction exactly — needle radial part, needle thrust part — for a 35 mm shaft; the thrust set is one-directional and must face the working axial load. Thrust needle sets tolerate slow speeds and heavy loads: the 5,600 r/min limiting speed is far below ball-thrust equivalents, and lubricant film at the washer faces governs life. Speed ceilings differ by part: 2,800 r/min thermal reference and 5,600 r/min limiting — the thrust element governs, since its washer faces see sliding components of contact. These units run at low speed with high axial load: verify lubricant channeling at the washer faces after the first hour, as the packed thrust set pumps grease axially out of the 30 mm tall envelope.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 35 mm bore, verify shaft deflection against the needle length: these rollers tolerate little edge loading, and a simply supported span between 35 mm seats can bend past the compensation range long before the load rating is exhausted.
• Oscillating pivots fail differently: rocking through a small angle concentrates wear in the same roller positions — inspect those zones, and consider rotating the assembly's clock position at service intervals.
• Contamination, not fatigue, kills most small needle bearings: with raceways this narrow, one hard particle dents a full-width line — seal the housing even when the bearing execution itself is open.
• Do not treat the axial rating 29 kN (Ca) as independent of radial load: the combined equivalent load formulas couple them, and a unit sized on radial life alone will spall the ball raceway first under real thrust.
• The thrust part is one-direction: reverse axial events — however brief — lift the rolling elements off the raceway, and the subsequent re-entry impact dents the washer face; mount the NKXR 35 Z facing the working thrust.
• The 24.6/45 kN ratings and 170 g mass are SKF catalogue values transcribed from ch. 7.10 of PUB BU/P1 17000 (PDF table page 660); combined-type axial ratings appear in the text above because the structured record carries radial values only.