Example fits using ISO hole basis
loose fit
transition
fixed
H6
h5
j6, k6
n5, r5
H7
f7, g6, h6
k6, m6, n6
r6, s6
H8
d9,e8, f8, h9
s8, u8, x8
Machining process associated with ISO IT Tolerance Grade
IT Grade
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Lapping
Honing
Super finishing
Cylindrical grinding
Diamond turning
Plan grinding
Broaching
Reaming
Boring, Turning
Sawing
Milling
Planing, Shaping
Extruding
Cold Rolling, Drawing
Drilling
Die Casting
Forging
Sand Casting
Hot rolling, Flame cutting
www.tribology-abc.com