ISO dimension series 08 · deep groove ball bearing
608
A 608 bearing measures 8 mm bore × 22 mm outside diameter × 7 mm width.
The basic number fixes the nominal boundary dimensions. It does not specify the seals, shields, internal clearance, cage, lubricant or precision class.
- 8mm
- 22mm
- 7mm
What does 608 mean?
6
Single row deep groove ball bearing.
0
Series digit used in the basic designation. The formal ISO classification is width series 0 plus diameter series 8: dimension series 08.
8
For this miniature designation, the final digit gives the 8 mm bore directly.
Miniature metric designations below a 10 mm bore use the bore diameter directly. For the larger bearings in this reference, codes 04 and above are multiplied by five; 00, 01, 02 and 03 mean 10, 12, 15 and 17 mm.
How does 608 compare with the same-bore series?
Every row below fits the same 8 mm shaft, but requires a different housing diameter and axial width. They are not drop-in alternatives unless all three dimensions match the assembly.
| Designation | Bore | Outside | Width | Envelope difference |
|---|---|---|---|---|
| 608 | 8 mm | 22 mm | 7 mm | Reference |
Can another maker's 608 replace it?
The nominal mounting envelope is standardised, so another maker's basic 608 has the same 8 × 22 × 7 mm boundary dimensions. That does not make every variant functionally interchangeable. Match the complete marking, especially its closure and clearance suffixes, and check the manufacturer's current datasheet for a critical application.
Read the complete marking
- 1. Basic designation: confirms the bearing type and boundary dimensions.
- 2. Closure suffix: identifies open, shielded or sealed construction; codes vary by manufacturer.
- 3. Clearance suffix: identifies radial internal clearance, such as C3 where specified.
- 4. Other suffixes: can identify cage, lubricant, tolerance, temperature or special construction.
Identify the complete 608 specification
Where these dimensions come from
The 8 × 22 × 7 mm figures were checked against NSK's published bearing data on 20 August 2026. ISO 15 is listed as the standards context; Axial Supply has not reproduced the standard itself.
- ISO 15:2017 — Rolling bearings — Radial bearings — Boundary dimensions, general planThe standards-level context for nominal radial-bearing boundary dimensions; the numerical values here were read from NSK's published tables.
- NSK Bearing Calculation Tool — 608NSK's current product calculation record gives the 608 boundary dimensions as 8 × 22 × 7 mm.