29. Basic profile of threads
■Metric Screw Threads ■Unified Screw Threads


Production data
Internal Internal
Thread Thread


External External
Thread Thread


d1 or D1
d2 or D2


d1 or D1
d2 or D2
d or D


d or D
Threads per inch

■Whitworth Screw Threads ■Screw Threads for Sewing Machine

Internal Internal
Thread Thread


External External
Thread


d1 or D1
d2 or D2
d1 or D1

d2 or D2


Thread


d or D
d or D


D1’
D1’


Threads per inch Threads per inch

■Miniature Screw Threads ■Parallel Pipe Threads

Internal
Internal Thread
Thread


External External
Thread Thread
d1 or D1
d2 or D2
d1 or D1
d2 or D2


d or D
d or D


Note : This figure rounds off 0.320744H.
Threads per inch

■Taper Pipe Threads ■Taper Pipe Threads (Parallel)

Internal
Thread
Internal
Thread


read
External Th
Information
Technical


Central axis line of thread Central axis line of thread


Threads per inch Threads per inch


Technical-82
853