General transition fit on the shaft-basis system, equivalent to H7/k6. K7 is common for the housing bore of rolling-bearing outer rings.
Deviations of hole K7 and shaft h6, and the resulting maximum / minimum clearance (negative values mean interference). Nominal sizes 0–500 mm, values in mm.
| Nominal size (mm) | Hole K7 (upper / lower) | Shaft h6 (upper / lower) | Max. clearance | Min. clearance | Fit type |
|---|---|---|---|---|---|
| 0 ~ 3 | 0 / -0.010 | 0 / -0.006 | clearance 0.006 | interference 0.010 | Transition |
| >3 ~ 6 | +0.003 / -0.009 | 0 / -0.008 | clearance 0.011 | interference 0.009 | Transition |
| >6 ~ 10 | +0.005 / -0.010 | 0 / -0.009 | clearance 0.014 | interference 0.010 | Transition |
| >10 ~ 18 | +0.006 / -0.012 | 0 / -0.011 | clearance 0.017 | interference 0.012 | Transition |
| >18 ~ 30 | +0.006 / -0.015 | 0 / -0.013 | clearance 0.019 | interference 0.015 | Transition |
| >30 ~ 50 | +0.007 / -0.018 | 0 / -0.016 | clearance 0.023 | interference 0.018 | Transition |
| >50 ~ 80 | +0.009 / -0.021 | 0 / -0.019 | clearance 0.028 | interference 0.021 | Transition |
| >80 ~ 120 | +0.010 / -0.025 | 0 / -0.022 | clearance 0.032 | interference 0.025 | Transition |
| >120 ~ 180 | +0.012 / -0.028 | 0 / -0.025 | clearance 0.037 | interference 0.028 | Transition |
| >180 ~ 250 | +0.013 / -0.033 | 0 / -0.029 | clearance 0.042 | interference 0.033 | Transition |
| >250 ~ 315 | +0.016 / -0.036 | 0 / -0.032 | clearance 0.048 | interference 0.036 | Transition |
| >315 ~ 400 | +0.017 / -0.040 | 0 / -0.036 | clearance 0.053 | interference 0.040 | Transition |
| >400 ~ 500 | +0.018 / -0.045 | 0 / -0.040 | clearance 0.058 | interference 0.045 | Transition |
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 transition fit (shaft-basis system). General transition fit on the shaft-basis system, equivalent to H7/k6. K7 is common for the housing bore of rolling-bearing outer rings.
The K7 hole is made to 10(+0.005/-0.010) and the h6 shaft to 10(0/-0.009). At the loosest that gives clearance 0.014, at the tightest interference 0.010 (mm).
Stock dowel pins come in h6, h7, m6 (plus tolerance) and minus tolerance (0/-0.02). Put the hole tolerance (K7) 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 →