Threading Thread Turning
Thread Profile Overview
Industry
General Machinery
Partial Profile 55º
Partial Profile 60°
NPT Taper Pipe Thread
ISO Metric
American UN
Whitworth
British BSPT
Thread Profile
Pitch：mm / TPI (Threads Per Inch)
48 16 44 14 40 13 36 12 32 11.5
36 14 32 12 28 11 26 10 10 9 19 8
0.50 2.0 0.75 2.5 1.00 3.0
27 18 14 11.5 8
Pitch TPI
0.50-1.5 0.50-3.0 1.75-3.0 3.50-5.0
0.50-1.5 0.50-3.0 1.75-3.0 3.50-5.0
28 19 14 11
1.25 1.50
28 11 24 10 20 9 18 8
Industry
General Machinery
Aerospace
Petroleum
BUT Buttress casing thread
ACME
Stub ACME
MJ ISO 5855
UNJ
API
API Round
Thread Profile
Pitch：mm / TPI (Threads Per Inch)
48 16 44 14 40 13 36 12 32 11 28 10
Pitch TPI
16 8 14 6 12 5 10
16 8 14 6 12 5 10 4
0.75 2.0 1.00 2.5 1.25 3.0 1.50
4 (V-0.038R) 4 (V-0.050) 5 (V-0.040) 6 (V-0.055)
10 8
5
24 9 20 8 18
* A wide range of thread types, including thread turning for general machinery, aerospace and petroleum industries * All ground inserts, better control of thread profile dimensional accuracy and consistency after insert indexing * Uniform edge honing and sharp cutting edges, more suitable for thread turning characteristics, resulting in superior thread surface quality
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