General running fit on the shaft-basis system, equivalent to H8/f7. With a standard h7 shaft or pin, make the bushing bore F8.
Deviations of hole F8 and shaft h7, and the resulting maximum / minimum clearance (negative values mean interference). Nominal sizes 0–500 mm, values in mm.
| Nominal size (mm) | Hole F8 (upper / lower) | Shaft h7 (upper / lower) | Max. clearance | Min. clearance | Fit type |
|---|---|---|---|---|---|
| 0 ~ 3 | +0.020 / +0.006 | 0 / -0.010 | clearance 0.030 | clearance 0.006 | Clearance |
| >3 ~ 6 | +0.028 / +0.010 | 0 / -0.012 | clearance 0.040 | clearance 0.010 | Clearance |
| >6 ~ 10 | +0.035 / +0.013 | 0 / -0.015 | clearance 0.050 | clearance 0.013 | Clearance |
| >10 ~ 18 | +0.043 / +0.016 | 0 / -0.018 | clearance 0.061 | clearance 0.016 | Clearance |
| >18 ~ 30 | +0.053 / +0.020 | 0 / -0.021 | clearance 0.074 | clearance 0.020 | Clearance |
| >30 ~ 50 | +0.064 / +0.025 | 0 / -0.025 | clearance 0.089 | clearance 0.025 | Clearance |
| >50 ~ 80 | +0.076 / +0.030 | 0 / -0.030 | clearance 0.106 | clearance 0.030 | Clearance |
| >80 ~ 120 | +0.090 / +0.036 | 0 / -0.035 | clearance 0.125 | clearance 0.036 | Clearance |
| >120 ~ 180 | +0.106 / +0.043 | 0 / -0.040 | clearance 0.146 | clearance 0.043 | Clearance |
| >180 ~ 250 | +0.122 / +0.050 | 0 / -0.046 | clearance 0.168 | clearance 0.050 | Clearance |
| >250 ~ 315 | +0.137 / +0.056 | 0 / -0.052 | clearance 0.189 | clearance 0.056 | Clearance |
| >315 ~ 400 | +0.151 / +0.062 | 0 / -0.057 | clearance 0.208 | clearance 0.062 | Clearance |
| >400 ~ 500 | +0.165 / +0.068 | 0 / -0.063 | clearance 0.228 | clearance 0.068 | Clearance |
Max. clearance = hole upper deviation − shaft lower deviation; min. clearance = hole lower deviation − shaft upper deviation; a negative result is an interference. Each row applies to the whole size range shown.
The shaft is the datum (h, upper deviation 0) and different fits are obtained by changing the hole tolerance. Used when the shaft is a ready-made part such as ground shafting or a dowel pin, or when several different fits are needed along one shaft.
It is a clearance fit (shaft-basis system). General running fit on the shaft-basis system, equivalent to H8/f7. With a standard h7 shaft or pin, make the bushing bore F8.
The F8 hole is made to 10(+0.035/+0.013) and the h7 shaft to 10(0/-0.015). At the loosest that gives clearance 0.050, at the tightest clearance 0.013 (mm).
Stock dowel pins come in h6, h7, m6 (plus tolerance) and minus tolerance (0/-0.02). Put the hole tolerance (F8) and the application in your enquiry and we will tell you which one fits as it is.
Values follow ISO 286-1; the table was cross-checked cell by cell against three independent sources on 2026-08-26 (6,674 cells agree, 0 errors). Coverage: shafts a–z and the corresponding uppercase holes, IT1–IT13, nominal sizes 0–500 mm. cd/ef/fg/za/zb/zc, sizes above 500 mm and grades above IT13 are not included: the tool reports "not found" and never extrapolates. Data sources and verification →