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Thread Chart


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PITCH (MM) ________THREADS PER INCH___
Size
Course
Fine
Extra Fine
UNC
UN8
UNF
BSW
BSF
M1.6
-
#0
0.35
-
-
-
-
80
-
-
M2
-
#1
0.4
-
-
-
-
72
-
-
-
-
#2
-
-
-
56
-
64
-
-
M2.5
-
#3
0.45
-
-
48
-
56
-
-
-
-
#4
-
-
-
40
-
48
-
-
M3
1/8
#5
0.5
-
-
40
-
44
40
-
M3.5
-
#6
0.6
-
-
32
-
40
-
-
M4
-
#8
0.7
-
-
32
-
36
-
-
M5
3/16
#10
0.8
-
-
24
-
32
24
32
-
-
#12
-
-
-
24
-
28
-
-
M6
1/4
-
1
-
-
20
-
28
20
26
M8
5/16
-
1.25
1
-
18
-
24
18
22
M10
3/8
-
1.5
1.25
1
16
-
24
16
20
-
7/16
-
-
-
-
14
-
20
14
18
M12
1/2
-
1.75
1.5
1.25
13
-
20
12
16
M14
9/16
-
2
1.5
-
12
-
18
12
16
M16
5/8
-
2
1.5
-
11
-
18
11
14
M18
-
-
2.5
1.5
-
-
-
-
-
-
M20
3/4
-
2.5
1.5
-
10
-
16
10
12
M22
7/8
-
2.5
1.5
-
9
-
14
9
11
M24
1
-
3
2
-
8
8
12 (14)
8
10
M27
1 1/8
-
3
2
-
7
8
12
7
9
M30
1 1/4
-
3.5
2
-
7
8
12
7
9
M33
1 3/8
-
3.5
2
-
6
8
12
6
8
M36
1 1/2
-
4
3
-
6
8
12
6
8
M39
1 5/8
-
4
3
-
-
8
-
5
8
M42
-
-
4.5
-
-
-
-
-
-
-
M45
1 3/4
-
4.5
-
-
5
8
-
5
7
M48
1 7/8
-
5
-
-
-
8
-
-
-
M52
2
-
5
-
-
4.5
8
-
4.5
7
M56
2 1/4
-
5.5
-
-
4.5
8
-
4
6
M60
-
-
5.5
-
-
-
-
-
-
-
M64
2 1/2
-
6
-
-
4
8
-
4
6
M72
2 3/4
-
6
-
-
4
8
-
3.5
6
M80
3
-
6
-
-
4
8
-
3.5
5
-
3 1/4
-
-
-
-
4
8
-
3.25
5
M90
3 1/2
-
6
-
-
4
8
-
3.25
4.5
-
3 3/4
-
-
-
-
4
8
-
3
4.5
M100
4
-
6
-
-
4
8
-
3
4.5

Hobson Engineering
Information provided as a guide by Hobson Engineering

 
 

 
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