NF308M

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

Bore d40 mmOutside diameter D90 mmWidth B23 mmDynamic rating Cr72,000 NNSK product page ↗

Live manufacturer catalog row

Published specifications

NSK online catalog

Designation: NF308M
Bore d: 40 mm
Outside diameter D: 90 mm
Width B: 23 mm
Minimum corner radius r: 1.5 mm
Minimum corner radius r1: 1.5 mm
Fw: Not applicable / not published
Ew: 77.5 mm
Basic dynamic load rating Cr: 72,000 N
Basic static load rating C0r: 57,000 N
Thermal speed rating — oil bath: 8,500 rpm
Mechanical speed — forced oil: Not published
Limiting speed — grease: 6,700 rpm
Limiting speed — oil: 8,500 rpm
Published row text: NF308M | 40 | 90 | 23 | 1.5 | 1.5 | | 77.5 | 72000 | 57000 | 8500 | | 6700 | 8500

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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