Weird thread size - help needed to identify!

[Shed]

Evening all,

I have broken a hub nut on one of my jalopies (a 1957 Bedford CA - same chassis as Vauxhall Wyvern) and trying to track down the size (and a replacement) is proving tricky...

Outside dia. of the half shaft threaded doofer is exactly 13/16" across the peak of the thread.
TPI is 16

I've tried:

7/8" BSF - it went on one turn so dia. Is about right, but wrong TPI
7/8" UNF - slightly too big and wrong TPI
3/4" UNF - too small

Any ideas before I scrap the bloody thing??

Cheers,

Steve

 

[ford34/2]

Nothing makes a lot of sense 13/16" would be .8125", but you say 7/8" will almost fit, at .875

sad news is on the few thread sizes I looked at theres nothing at 16TPI at either of the sizes. 7/8" BSF was only 11 TPI
There was an Admiralty thread at 13/16",or .813" and 14 TPI-- cant see Bedford using that.
There is a CF site: might be worth a join and post.
http://bedford-cf.co.uk/mboard/newposts.php
Sorry
Stan

 

[DuffyBB]

May be Whitworth in that sort of age range?

 

[ford34/2]

Whitworth at 7/8" was only 9TPI,
Steve thinks its 16TPI.
Realy need confirmation of an accurate OD of the shaft. and if 16TPI is def right I`m a bit stuck

Stan

 

[the snooper]

Unified Thread Series 16 TPI ANSI B1.1

chart here

 

[ford34/2]

Thats a good table, mine said 7/8" UNF was 14 TPI.
Possibly the nut you tried was 14??-- worth a check

Stan

 

[the snooper]

nothing worse then not being able to identify something you need

 

[graffian]

Sounds like 16tpi UN same as land rover track rods.
Ask someone with a lathe to make you a nut.

 

[Wallace]

Are you 100% sure on the 60° 16TPI Steve?

 

[Rocketman]

nothing worse then not being able to identify something you need

There is one thing.

Being able to identify something and finding out it's no longer available

 

[awemawson]

Taps & Dies are available:

http://www.tracytools.com/13-16-x-16-tpi

 

[Shed]

Hi all,

Thanks for all the replies, it looks like its a 16-UN thread, as the dimensions match up. I've tried a few places online - can anyone recommend a supplier?

Cheers,

Steve

 

[ford34/2]

16 TPI was a standard option on a lathe with imperial screwcutting, when you get very, very desperate, consider making one or getting one made on a lathe. Or consider the Bedford CF site again, someone must know of a supply.

Stan

 

[nickk]

+ 1 for tracy tools,great for taps & dies & even l/h drills,knowledgeable staff just for a change,