p7 tolerance (shaft, IT7)
Shaft tolerance class p7 per ISO 286-1:2010: fundamental deviation ei +6 … +68, grade IT7 (10 µm at ≤ 3 mm to 63 µm at 400–500 mm). For an exact size, open the calculator with p7 selected.
- Type
- Shaft
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- ei +6 … +68 µm
p7 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +16 | +6 | 3.016 | 3.006 | +0.016 | +0.006 | +0.00063 / +0.00024 |
| 3 – 6 | +24 | +12 | 6.024 | 6.012 | +0.024 | +0.012 | +0.00094 / +0.00047 |
| 6 – 10 | +30 | +15 | 10.030 | 10.015 | +0.030 | +0.015 | +0.00118 / +0.00059 |
| 10 – 14 | +36 | +18 | 14.036 | 14.018 | +0.036 | +0.018 | +0.00142 / +0.00071 |
| 14 – 18 | +36 | +18 | 18.036 | 18.018 | +0.036 | +0.018 | +0.00142 / +0.00071 |
| 18 – 24 | +43 | +22 | 24.043 | 24.022 | +0.043 | +0.022 | +0.00169 / +0.00087 |
| 24 – 30 | +43 | +22 | 30.043 | 30.022 | +0.043 | +0.022 | +0.00169 / +0.00087 |
| 30 – 40 | +51 | +26 | 40.051 | 40.026 | +0.051 | +0.026 | +0.00201 / +0.00102 |
| 40 – 50 | +51 | +26 | 50.051 | 50.026 | +0.051 | +0.026 | +0.00201 / +0.00102 |
| 50 – 65 | +62 | +32 | 65.062 | 65.032 | +0.062 | +0.032 | +0.00244 / +0.00126 |
| 65 – 80 | +62 | +32 | 80.062 | 80.032 | +0.062 | +0.032 | +0.00244 / +0.00126 |
| 80 – 100 | +72 | +37 | 100.072 | 100.037 | +0.072 | +0.037 | +0.00283 / +0.00146 |
| 100 – 120 | +72 | +37 | 120.072 | 120.037 | +0.072 | +0.037 | +0.00283 / +0.00146 |
| 120 – 140 | +83 | +43 | 140.083 | 140.043 | +0.083 | +0.043 | +0.00327 / +0.00169 |
| 140 – 160 | +83 | +43 | 160.083 | 160.043 | +0.083 | +0.043 | +0.00327 / +0.00169 |
| 160 – 180 | +83 | +43 | 180.083 | 180.043 | +0.083 | +0.043 | +0.00327 / +0.00169 |
| 180 – 200 | +96 | +50 | 200.096 | 200.050 | +0.096 | +0.050 | +0.00378 / +0.00197 |
| 200 – 225 | +96 | +50 | 225.096 | 225.050 | +0.096 | +0.050 | +0.00378 / +0.00197 |
| 225 – 250 | +96 | +50 | 250.096 | 250.050 | +0.096 | +0.050 | +0.00378 / +0.00197 |
| 250 – 280 | +108 | +56 | 280.108 | 280.056 | +0.108 | +0.056 | +0.00425 / +0.00220 |
| 280 – 315 | +108 | +56 | 315.108 | 315.056 | +0.108 | +0.056 | +0.00425 / +0.00220 |
| 315 – 355 | +119 | +62 | 355.119 | 355.062 | +0.119 | +0.062 | +0.00469 / +0.00244 |
| 355 – 400 | +119 | +62 | 400.119 | 400.062 | +0.119 | +0.062 | +0.00469 / +0.00244 |
| 400 – 450 | +131 | +68 | 450.131 | 450.068 | +0.131 | +0.068 | +0.00516 / +0.00268 |
| 450 – 500 | +131 | +68 | 500.131 | 500.068 | +0.131 | +0.068 | +0.00516 / +0.00268 |
Deviations at the upper end of each range (Ø columns use that size); use the calculator for the exact size. — : not defined by ISO 286 for that size. Upper/Lower (mm) and inch columns are shown on wider screens.
About p7
p7 denotes a shaft tolerance zone with press deviation in the ISO 286 system. It is used in H7/p7 (Coarser than H7/p6 for interference fits that lock parts against movement and light torque without a key: bushings pressed into castings, locating pins in fixtures.) and H8/p7 (Coarser than H7/p7, on an IT8 hole; lands as a light interference or a very tight clearance, used where full H7/p6-class precision isn't justified but the joint must not move in service.).
At Ø25 mm p7 is +0.043 / +0.022 mm, i.e. 25.022 to 25.043 mm.
How the limits are calculated
p7 uses grade IT7 (a standard tolerance of 21 µm at 18–30 mm). Fundamental deviation: ei is tabulated directly by ISO 286-1 Table 2; es = ei + IT7. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.