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UNS 1/4" x 32 the same as ME 1/4" x 32 ?

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Blue Heeler29/09/2020 23:45:16
274 forum posts

Forgive me is this is a stupid question but is UNS 1/4" x 32 the same as ME 1/4" x 32 ?

peak430/09/2020 00:12:44
1674 forum posts
175 photos
Posted by Blue Heeler on 29/09/2020 23:45:16:

Forgive me is this is a stupid question but is UNS 1/4" x 32 the same as ME 1/4" x 32 ?


I'll stand to be corrected, but I thought ME threads were based on BSW/BSF thread form, which would put the included angle at 55°, whereas UNS is based on Unified threads at 60°


p.s. no question is stupid, but beware of some of my answers. blush

p.p.s. Lots of useful stuff on this chap's website ; particularly the Data and Tables tab

Edited By peak4 on 30/09/2020 00:16:48

Thor 🇳🇴30/09/2020 05:24:13
1602 forum posts
45 photos

Bill is right, here or here are charts of American screw threads, and here for ME threads.


Blue Heeler30/09/2020 05:51:15
274 forum posts

Thank you for the replies, appreciated.

JasonB30/09/2020 07:04:34
22574 forum posts
2634 photos
1 articles

You want the UNEF 1/4 x 32 for glow plugs, mini sparkplugs etc.

I.M. OUTAHERE30/09/2020 08:41:45
1468 forum posts
3 photos

If you need one of these taps or dies you can try LPR toolmakers in Victoria , they are usually my first port of call for odd sizes or obsolete thread forms .
An engine i’m looking at building - The M.E. Beam engine requires a 10BA - LH thread for the throttle linkage adjuster nut and one end of the throttle rod ( creates a turnbuckle arrangement ) try getting one of those here in Australia 😫.

Blue Heeler30/09/2020 08:46:01
274 forum posts

Thanks XD, I wanted to make up some extra BIX gas burner copper lines with gas jets for some steam engines and the thread is Me 1/4" x 32" I have all the other ME taps & dies except that. I get a lot of stuff from LRP we are lucky that we have them for a lot of things. Getting them in from the UK, the postage is always rising.

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