Austain Imperial Thread Size Guide
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1TECHNICAL INFORMATION
Imperial Thread Size Guide
Imperial Thread Sizes
Imperial TPI Table
Threads Per Inch
14 tpi
Diameter
6 tpi
In Inches
BSW
UNC
UNF
BSF
16 tpi
40
40
-
-
7 tpi
32
32
-
-
18 tpi
24
24
32
32
8 tpi
20
20
28
26
20 tpi
18
18
24
22
9 tpi
16
16
24
20
14
14
20
18
24 tpi
10 tpi
12
13
20
16
11
11
18
14
28 tpi
10
10
16
12
11 tpi
9
9
14
11
32 tpi
1
8
8
12
10
12 tpi
1
7
7
12
9
40 tpi
1
7
7
12
9
13 tpi
1
6
6
12
8
Imperial Thread Diameters
”
”
”
”
”
”
”
”
”
”
1
”
1
”
”
1”
1
”
0
1
2
3
4
5
6
in
Scale Check: After printing measure scale above with a ruler to ensure correct scale.
Note: this information is provided as a guide only and should not be used when working to high tolerences.
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