Metric Thread Gage Pitch Diameters

(Tolerance Class 6 - Sizes M15 Through M39)

Thread Size
Plug Gage
Ring Gage
GO

Class 6H

NO GO

Class 6H

GO

Class 6g

NO GO

Class 6g

M15.0x1.00
14.350mm
14.510mm
14.324mm
14.206mm
M15.0x1.50
14.026mm
14.216mm
13.994mm
13.854mm
M16.0x1.00
15.350mm
15.510mm
15.324mm
15.206mm
M16.0x1.50
15.026mm
15.216mm
14.994mm
14.854mm
M16.0x2.00
14.701mm
14.913mm
14.663mm
14.503mm
M17.0x1.00
16.350mm
16.510mm
16.324mm
16.206mm
M17.0x1.50
16.026mm
16.216mm
15.994mm
15.854mm
M18.0x1.00
17.350mm
17.510mm
17.324mm
17.206mm
M18.0x1.50
17.026mm
17.216mm
16.994mm
16.854mm
M18.0x2.00
16.701mm
16.913mm
16.663mm
16.503mm
M18.0x2.50
16.376mm
16.600mm
16.334mm
16.164mm
M20.0x1.00
19.350mm
19.510mm
19.324mm
19.206mm
M20.0x1.50
19.026mm
19.216mm
18.994mm
18.854mm
M20.0x2.00
18.701mm
18.913mm
18.663mm
18.503mm
M20.0x2.50
18.376mm
18.600mm
18.334mm
18.264mm
M22.0x1.00
21.350mm
21.510mm
21.324mm
21.206mm
M22.0x1.50
21.026mm
21.216mm
20.994mm
20.854mm
M22.0x2.00
20.701mm
20.913mm
20.663mm
20.503mm
M22.0x2.50
20.376mm
20.600mm
20.334mm
20.164mm
M24.0x1.00
23.350mm
23.510mm
23.324mm
23.206mm
M24.0x1.50
23.026mm
23.226mm
22.994mm
22.854mm
M24.0x2.00
22.701mm
22.925mm
22.663mm
22.493mm
M24.0x3.00
22.051mm
22.316mm
22.003mm
21.803mm
M25.0x1.00
24.350mm
24.520mm
24.324mm
24.199mm
M25.0x1.50
24.026mm
24.226mm
23.994mm
23.844mm
M25.0x2.00
23.701mm
23.925mm
23.663mm
23.493mm
M26.0x1.00
25.350mm
25.520mm
25.324mm
25.199mm
M26.0x1.50
25.026mm
25.226mm
24.994mm
24.844mm
M27.0x1.00
26.350mm
26.520mm
26.324mm
26.199mm
M27.0x1.50
26.026mm
26.226mm
25.994mm
25.844mm
M27.0x2.00
25.701mm
25.925mm
25.663mm
25.493mm
M27.0x3.00
25.051mm
25.316mm
25.003mm
24.803mm
M28.0x1.00
27.350mm
27.520mm
27.324mm
27.199mm
M28.0x1.50
27.026mm
27.226mm
26.994mm
26.844mm
M28.0x2.00
26.701mm
26.925mm
26.663mm
26.493mm
M30.0x1.00
29.350mm
29.520mm
29.324mm
29.199mm
M30.0x1.50
29.026mm
29.226mm
28.994mm
28.844mm
M30.0x2.00
28.701mm
28.925mm
28.663mm
28.493mm
M30.0x3.50
27.727mm
28.007mm
27.674mm
27.462mm
M32.0x1.50
31.026mm
31.226mm
30.994mm
30.844mm
M32.0x2.00
30.701mm
30.925mm
30.663mm
30.493mm
M33.0x1.50
32.026mm
32.226mm
31.994mm
31.844mm
M33.0x2.00
31.701mm
31.925mm
31.663mm
31.493mm
M33.0x3.50
30.727mm
31.007mm
30.674mm
30.462mm
M35.0x1.50
34.026mm
34.226mm
33.994mm
33.844mm
M36.0x1.50
35.026mm
35.226mm
34.994mm
34.844mm
M36.0x2.00
34.701mm
34.925mm
34.663mm
34.493mm
M36.0x3.00
34.051mm
34.316mm
34.003mm
33.803mm
M36.0x4.00
33.402mm
33.702mm
33.342mm
33.118mm
M38.0x1.50
37.026mm
37.226mm
36.994mm
36.844mm
M39.0x1.50
38.026mm
38.226mm
37.994mm
37.844mm
M39.0x2.00
37.701mm
37.925mm
37.663mm
37.493mm
M39.0x3.00
37.051mm
37.316mm
37.003mm
36.803mm
M39.0x4.00
36.402mm
36.702mm
36.342mm
36.118mm
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