Identify Screw Threads from Major Diameter and Thread Pitch
If you spot an error let me know or if you think I have missed a series out out.
Or any comment.
The table, on the attached link, lists most major thread series sorted in order of Major Diameter then Thread Pitch, from 3mm to 3/4"
If you are a bit lost, as I often am, and can't figure out what thread you are looking at try this look up list.
Measure the thread Major (outer) Diameter and then the Thread Pitch, and try looking it up.
This is not guaranteed to get you the answer but might help.
info is included for for:-
Metric (Coarse and Fine)
Old French Metric
System Francais (SF),
Unified (Coarse UNC, Fine UNF and Extra Fine UNEF),
British Standard Fine BSF
British Standard Cycle BSCy
British Standard Pipe Parallel BSPP
British Association BA
(Grey Cells are calculations from TPI to mm pitch or the other way round)