Size of threads on milling arbor

[Jens Eirik Skogstad 1Participant @jenseirikskogstad1]

Hi folks, i has bought milling arbor with 3/8 treads for drawbar. I has tried with 3/8 tap, do not fit in the 3/8 treads. Which size is treads on 3/8 drawbar? I must create a new drawbar for milling arbor with 3/8 size.

[Jens Eirik Skogstad 1Participant @jenseirikskogstad1]

[JasonBModerator @jasonb]

Try 3/8" whitworth

[Jens Eirik Skogstad 1Participant @jenseirikskogstad1]

Also it’s 16 treads on 3/8?

[JasonBModerator @jasonb]

Yes 16tpi on 3/8" Whit

[Michael GilliganParticipant @michaelgilligan61133]

This nicely summarises UNC / Whitworth compatibilty: **LINK**

https://rycote.zendesk.com/hc/en-us/articles/204439391-3-8-Thread-Standards

MichaelG.

[Jens Eirik Skogstad 1Participant @jenseirikskogstad1]

Thanks a lot! Now i can create a new drawbar with 3/8-16 and i has already 2 drawbar with 12mm and 1/2″.

[Martin ConnellyParticipant @martinconnelly55370]

m10 x 1.5 is very close to3/8" x 16tpi. I would check if it is M10 as well as 3/8" x 16.

Martin C

[SillyOldDufferModerator @sillyoldduffer]

Posted by Martin Connelly on 30/07/2018 08:23:40:

m10 x 1.5 is very close to3/8" x 16tpi. I would check if it is M10 as well as 3/8" x 16.

Martin C

+1 for that possibility.

They're so close you can convert one into the other by gently running a tap into the female thread. I wouldn't recommend it for everything, but it's an OK bodge on a drawbar.

Dave

Edited By SillyOldDuffer on 30/07/2018 09:11:39

[Jens Eirik Skogstad 1Participant @jenseirikskogstad1]

I has tried with M10, will not distort the treads.. best to use correct size.

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