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View Full Version : 5/16- 18 thread compared to 8mm 1.25mm pitch



Black Forest
12-13-2014, 04:41 PM
How different are they? How can I get a crest to crest comparison?

Yow Ling
12-13-2014, 04:46 PM
http://scienceshareware.com/articles/threads/machine-threads-and-standard-thread.htm

brian Rupnow
12-13-2014, 04:52 PM
5/16-18 is 18 threads per inch so 1 divided by 18=.05555" crest to crest x 25.4=1.4111 MM--So---crest to crest is different by 1.4111-1.25=.16 mm .

Black Forest
12-13-2014, 05:04 PM
5/16-18 is 18 threads per inch so 1 divided by 18=.05555" crest to crest x 25.4=1.4111 MM--So---crest to crest is different by 1.4111-1.25=.16 mm .

Thank you Brian!!!