Thread size

[Andy Moltu]

Decided to replace the woodscres that were holding the door handles on.

Unfortunately the screws had damaged  the threads on 3 of the 4 caged nuts to the point that I couldn't use the correct screws.

Anyone know what thread they are so I can tap them out? Certainly smaller than any of my kit.

Plan B might be to do what I'd doing on the 6 which is to grind down some M5 caged nuts which can then be made to fit the cut outs in the doors but I'd rather save the existing ones but originals are out of supply.

[RogerH]

Hi Andy,

if you measure the outside diameter of the screw and it comes near 0.152" then it is almost certainly 8/40 UNF.

On my TR4 rebuild I used M4 rivnuts with a suitable backing plate added.

A friend of mine had his 4A rebuilt but was having problems with the door handles.

When I removed the door card I found that the cage nuts were in place and in tact. BUT !!! the rebuilder decided to use woodscrews about 1/2" away from the correct location.

 

Roger

[Andy Moltu]

At least whover put the cards on mine managed to put them in the right place!

[Andy303]

Are to referring to item #71 in the attached Moss (USA) catalog diagram?

The SPC lists this a Part #PT0504, a No. 10 UNF (10-32) screw, 1/2" long.

For for data see also: https://smithy.com/machining-reference/drilling/page/23

[RogerH]

or perhaps #146  https://www.moss-europe.co.uk/shop-by-model/triumph/tr2-4a/body-chassis/doors-fittings/doors-fittings-tr4-4a-1961-67.html

I'll go and measure it now.

Update - it is 8/32 UNF   5/32" dia          Similar to M4    

Roger

 

Edited May 19, 2020 by RogerH

[Grahamgl]

Andy,

There are a set of four currently on EBay. Sorry I do not know how to post a link.

Graham

[david ferry]

I have some spares floating around if you're interested.

David