Can anyone recognise this thread?

Can anyone recognise this thread?

This topic has 9 replies, 6 voices, and was last updated 15 January 2026 at 21:43 by Nicholas Farr.

Viewing 10 posts - 1 through 10 (of 10 total)

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15 January 2026 at 15:09 #832695
Greensands
Participant
@greensands
Does any recognise the thread as machined on a pair of Juliet X-Head pins which mic up as 3/16x36tpi? The drawing for the item calls for a 5/32×40 or a 3BA thread but it does not conform to either of these standard sizes.
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15 January 2026 at 15:17 #832698
JasonB
Moderator
@jasonb
How sure are you of the tpi? as 2BA is only a couple of thou less than 3/16″ at 0.185″ but coarser at 31.4tpi

There is also #10-36 UNEF which is the right tpi but 0.190″ dia
15 January 2026 at 15:51 #832704
Charles Lamont
Participant
@charleslamont71117
Pedantry corner: #10-36 seems to be UNS, S for Special, not UNEF which apparently only goes as small as #12-32.
15 January 2026 at 15:53 #832706
JasonB
Moderator
@jasonb
Quite right charles.
15 January 2026 at 16:11 #832708
Greensands
Participant
@greensands
I can’t belive that it us anything as exotic as a UN/UNF thread form but at the moment I have yet to come up with an answer. 2BA and 10-32 are close on diameter and make a partial entry into to the corresponding tapped hole but are not right on TPI which unaccountably records a pretty good fit at 36 on my thread gauge.
15 January 2026 at 16:51 #832711
Michael Gilligan
Participant
@michaelgilligan61133
A look at the thread form should readily distinguish between BA and UN

Get the Loupe out
MichaelG.
15 January 2026 at 17:16 #832713
Nicholas Farr
Participant
@nicholasfarr14254
Hi. apart from what has been said, the only thing I can find is ANF 8 36TPI, but that is just under 11/64″, Maybe someone just screw-cut the threads that you have, but of course they would have done the nuts as well.

Regards Nick.
15 January 2026 at 18:36 #832725
noel shelley
Participant
@noelshelley55608
4.5mm X .75mm ? 0.177″ X approx 34tpi . Worth a try ? Noel.
15 January 2026 at 18:39 #832727
Greensands
Participant
@greensands
I have decided to cut my losses and drill out the X-Head to receive a newly made pin threaded 3BA. Thanks for all the help offered.
15 January 2026 at 21:43 #832747
Nicholas Farr
Participant
@nicholasfarr14254
Hi Greensands, that seems like a good plan to me.

Regards Nick.
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