NU311EM

Manufacturer-published dimensions, load ratings, thermal speed rating, and limiting speeds.

Bore d55 mmOutside diameter D120 mmWidth B29 mmDynamic rating Cr169,000 NNSK product page ↗

Live manufacturer catalog row

Published specifications

NSK online catalog

Designation: NU311EM
Bore d: 55 mm
Outside diameter D: 120 mm
Width B: 29 mm
Minimum corner radius r: 2 mm
Minimum corner radius r1: 2 mm
Fw: 70.5 mm
Ew: Not applicable / not published
Basic dynamic load rating Cr: 169,000 N
Basic static load rating C0r: 143,000 N
Thermal speed rating — oil bath: 6,000 rpm
Mechanical speed — forced oil: 10,000 rpm
Limiting speed — grease: 4,500 rpm
Limiting speed — oil: 5,600 rpm
Published row text: NU311EM | 55 | 120 | 29 | 2 | 2 | 70.5 | | 169000 | 143000 | 6000 | 10000 | 4500 | 5600

Verification boundary

Do not infer interchange

Bearing designConfirm N/NU/NJ/NUP/NF flange arrangement and exact suffixes.

Fit and clearanceVerify shaft/housing tolerances, internal clearance, shoulders, fillets, and mounting method.

DutyCheck speed, lubrication, temperature, radial/axial load handling, contamination, and required life.

Current product dataConfirm the exact designation on the linked NSK product page before ordering.

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