Cylindrical Roller Bearings

Cylindrical Roller Bearings — NU, NJ & NUP Series

Cylindrical roller bearings carry significantly higher radial loads than ball bearings of the same envelope size — the line contact between rollers and raceways distributes load over a larger area. AIMS Industrial stocks cylindrical roller bearings from NACHI — NU (free axial displacement), NJ (one-direction axial location), and NUP (both directions) series for industrial motors, gearboxes, and heavy machinery.

Cylindrical Roller Bearings We Stock

NU Series (Floating Bearing) — NU200 & NU300

NACHI NU cylindrical roller bearings have flanges on the outer ring only — allowing free axial displacement between inner ring and rollers. Used as the floating (non-locating) bearing in a locating/non-locating bearing pair, accommodating thermal shaft expansion without generating axial load. NACHI NU200 and NU300 series are the standard stocked range.

NJ Series (One-Direction Axial Location) — NJ200

NACHI NJ series bearings locate the shaft axially in one direction — used in conjunction with NU bearings or as a single locating bearing where axial load acts in one direction only. NACHI NJ200 series is stocked for industrial motor and gearbox applications.

NUP Series (Full Axial Location)

NACHI NUP series bearings locate the shaft axially in both directions — carrying axial load in both directions in a single bearing. Suited to applications where a single bearing must provide both radial and bidirectional axial location without a separate thrust bearing.

C3 Clearance Grade

NACHI cylindrical roller bearings are available in C3 (greater than normal) internal clearance — the correct selection for press-fitted applications and elevated operating temperatures where thermal expansion reduces internal clearance during service.

Cylindrical Roller Bearing Selection Guide

Locating vs Non-Locating

In most shaft arrangements, one bearing locates the shaft axially (NJ or NUP) and the other bearing floats (NU) to accommodate thermal expansion. Failure to include a floating bearing results in axial load induced by thermal shaft growth — significantly reducing bearing life.

Higher Radial Load Capacity

Cylindrical roller bearings provide 30–50% higher radial load capacity than the equivalent envelope size ball bearing — the correct choice when radial loads exceed ball bearing capacity or when bearing life targets require a higher dynamic load rating than an available ball bearing provides.

Cage Material

• Pressed steel cage — general-purpose applications
• Brass cage — higher temperature resistance, high-speed applications
• Polymer cage — reduced noise, ideal for motors and vibration-sensitive equipment

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As a proudly Australian business since 1988, we stock locally and work with trusted distributors to ensure fast, reliable supply.

See our full bearings range including ball bearings, angular contact bearings, and bearing housings.