Thread classification and thread processing(一)
I. Classification of threads
1. Fastening connection thread
1). Metric common thread M
2). Uniform thread of US system UN
3). English Whitworth thread B.S.W,B.S.F,Whit.
4). Metric small thread S
5). Metric aerospace thread MJ
6). US aerospace thread UNJ
2. Drive connection thread
1). Trapezoidal thread
2). Serrated thread
3.Pipe thread
1). Inch pipe thread (55o)
a). General seal pipe thread R
b). Non-sealed pipe thread G
2). US pipe thread (60o)
a). General Sealed Pipe Thread NPT,NPSC
b). Dry seal pipe thread NPTF,NPSM,NPSI
c). Non-sealed pipe thread NPSM,NPSL,NPTR
3). Metric pipe thread (60o)
a). General Sealed Metric Pipe Threads ZM,M
b). Non-sealed metric pipe thread M
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