FAGNU2310EM1Single Row Cylindrical Roller Bearing 50x110x40 mm, NU Design Non-Locating, Reinforced E, Machined Brass Cage

Product Description

What this part is

A FAG NU2310-E-M1 single-row cylindrical roller bearing, 50 mm bore x 110 mm outside diameter x 40 mm wide. This is the wide 23-series section, so it carries a great deal more radial load than a 2310-envelope ball bearing — 193 kN dynamic — and it is the standard heavy-duty floating bearing in electric motors, gearboxes, pumps and traction drives.

Decoding the designation

NU — two ribs on the outer ring, no ribs on the inner ring. The inner ring is a plain cylinder, so the roller set can slide along it.
23 — ISO dimension series 23 (wide section, extra capacity).
10 — 50 mm bore.
E — reinforced internal design: more and longer rollers, higher load rating than the standard NU2310.
M1 — solid machined brass cage, two-piece, roller-guided.
No clearance suffix — normal (CN) radial internal clearance. Running accuracy P6.

Schaeffler now sells this as NU2310-E-XL-M1 under the X-life label; NU2310-E-M1 is the superseded designation for the same bearing.

What these specs mean in practice

Because the inner ring is smooth, this is a non-locating bearing. It takes radial load only and lets the shaft move axially in both directions relative to the housing — up to about 3.2 mm of displacement. Use it at the free end of a shaft, with a locating bearing at the other end.

This is the point where substitutions go wrong. An NJ2310 has one rib on the inner ring and locates the shaft in one direction. An NUP2310 has two (one a loose flange) and locates in both. Fitting an NU where the drawing calls for an NJ or NUP removes the axial location and the shaft will walk. Fitting an NJ or NUP where the drawing calls for an NU jams a thermally growing shaft. Read the letters before you order.

The machined brass cage handles higher temperature, higher speed and shock loading than a polyamide (TVP) cage and is preferred for oil-lubricated gearboxes. The E design puts more capacity in the same envelope, which is why the ratings are high relative to older NU2310 catalogue figures.

Published ratings and mounting data

Basic dynamic load rating C: 193 kN
Basic static load rating C0: 187 kN
Fatigue limit load Cu: 35.5 kN
Limiting speed: 11 600 rpm — Reference speed: 4 900 rpm
Bore d 50 mm — OD D 110 mm — Width B 40 mm
Outer-ring raceway diameter E: 97 mm — Inner-ring raceway diameter F: 65 mm
D1: 92.48 mm — permissible axial displacement s: 3.2 mm
Chamfer r min and r1 min: 2 mm — ra max: 2 mm
Shaft abutment da max 63 mm — db min 67 mm — housing abutment Da max 99 mm
Radial internal clearance: CN (normal) — Running accuracy: P6
Operating temperature: −30 °C to +150 °C — Mass: 1.89 kg

Quantity and configuration

Sold as 1 Pc — one complete bearing: outer ring with ribs, brass cage and roller set, plus the smooth inner ring. Separable, so it arrives as two pieces that belong together.

Fitting notes

Mount the inner ring on the shaft and the ribbed outer ring in the housing independently, then bring them together axially — that separability is the whole reason this type is used where both rings need an interference fit. Respect the 2 mm chamfer clearance at the abutments; a shaft shoulder that runs past da max will foul the roller set. Do not let the outer ring rotate in a loose housing bore; with two ribs carrying all the guidance, a spinning outer ring wears the bore fast.

Interchange guidance

Dimensionally interchangeable with NU2310-series single-row cylindrical roller bearings from other makers: SKF NU 2310 ECML or NU 2310 ECP, NSK NU2310EM, NTN NU2310EG1, Koyo NU2310R, Timken NU2310EMA. Match the cage — ECML/EM/M1 are brass, ECP/ETVP2 are polyamide — and match the clearance class. These are related sizes, not substitutes: NJ2310-E-M1, NUP2310-E-M1 and N2310-E-M1 share the 50x110x40 envelope but have completely different rib arrangements and therefore different axial behaviour. Only the NU is non-locating in both directions.