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What is this thread called these days? 3/4"-16 SAE

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Kevin Murrell22/10/2019 15:24:55
32 forum posts
2 photos

In other words, what search term ought I to use to find a suitable tap - in all the suppliers.


Stueeee22/10/2019 15:33:40
49 forum posts

If it's SAE, it would normally have a 60º thread angle, so would be 3/4" x 16 UNS (Unified Special) or possibly UNEF (Unified Extra Fine)

Clive Foster22/10/2019 15:35:25
2205 forum posts
73 photos

For all practical purposes in the UK 3/4 x 16 UNF is the same thread.

Theoretically there can be small differences in the specifications, particularly if its old, but nothing that will matter to the fit of ordinary threads.


Keith Long22/10/2019 15:35:32
833 forum posts
11 photos

You've already got the search term,"3/4" - 16 SAE" followed by "tap" works for me. You could always try 3/4" UNF.

Kevin Murrell22/10/2019 15:36:50
32 forum posts
2 photos

Thanks all. TraceyTools came up trumps.

Edited By Kevin Murrell on 22/10/2019 15:36:59

John Reese22/10/2019 16:51:22
842 forum posts

I believe the SAE callout was abandoned many years ago and replaced by UNF.

old mart22/10/2019 16:54:07
1771 forum posts
138 photos

Also threads marked NF are now UNF.

Bill Davies 222/10/2019 18:35:54
188 forum posts
11 photos

I was taught that UNC and UNF were replacing (or had replaced) BSW and BSF in the British motor industry, and would be adopted by the rest of the mechanical engineering industries. That was in 1968.

It was a common standard agreed between USA, UK and Canada after the Second World War. Wikipedia says that the system was adopted in 1948.

Wikipedia - Unified threads adopted

Nicholas Farr22/10/2019 19:21:29
2264 forum posts
1099 photos
Posted by old mart on 22/10/2019 16:54:07:

Also threads marked NF are now UNF.

Hi, but with the exception of 1"


The one on the left is 1" x 14 NF and the one on the right is 1" x 12 UNF.

Regards Nick.

old mart22/10/2019 20:27:57
1771 forum posts
138 photos

Thee were some changes made when UNF was ratified, that 12/14 tpi was exactly where the change took place. UNF threads from 1" upwards are now fixed at 12tpi, unless they are UNS, which could be anything.

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