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NTN 6308ZN: bore d 40.000 mm, outside diameter D 90.000 mm, width B 23.000 mm, drawn to scaled 40.000 mmD 90.000 mmB 23.000 mmSingle Shielded
Drawing: BearingLookup, to the printed bore d, outside diameter D and width B cited in the specifications below; internal detail is illustrative.

NTN 6308ZN deep groove ball bearing

NTN 6308ZN deep groove ball bearing Single Shielded CN (NTN Bearing Finder: Item # 6308ZN): bore d 40.000 mm (1.5748 in), outside diameter D 90.000 mm (3.5433 in), width 23.000 mm (0.9055 in).

Deep groove ball bearings · All NTN part numbers

Open deep groove ball bearing with its steel balls visible
A typical deep groove ball bearing — not necessarily this part. Photo: “1984 deep groove ball bearing UR 6304 made in Czechoslovakia by ZKL” by R. Henrik Nilsson, CC BY 4.0, via Wikimedia Commons (resized).

Specifications

Bore d40.000 mm (1.5748 in)
Outside diameter D90.000 mm (3.5433 in)
Width23.000 mm (0.9055 in)
Basic dynamic load rating Cr45.00 kN
Basic static load rating C0r24.00 kN
Limiting speed, grease lubrication7800.0 RPM
Limiting speed, oil lubrication9200 RPM
EnclosureSingle Shielded
Radial internal clearanceCN
Cage typePressed
Cage materialSteel
Bore typeRound
PrecisionClass 0
MaterialHigh Carbon Chrome Steel
TypeBall Bearing

All specifications: Verified printed in NTN’s own product listing

Same size, other makers and types (40 × 90 × 23 mm)

PartManufacturerType
7308Koyoangular contact ball bearing
7308BKoyoangular contact ball bearing
7308CKoyoangular contact ball bearing
N308Koyocylindrical roller bearing
NF308Koyocylindrical roller bearing
NJ308RKoyocylindrical roller bearing
NU308RKoyocylindrical roller bearing
NUP308RKoyocylindrical roller bearing
6308 2RDKoyodeep groove ball bearing
6308 2RSKoyodeep groove ball bearing
6308 2RUKoyodeep groove ball bearing
6308 ZZKoyodeep groove ball bearing

These match this part on the dimensions each maker prints. A size match is not a stated interchange: check the other specifications before substituting. 7 more share this size.

Related parts

Sources