UNEF nuts

[stuhaynes]

Fellow boater with a seventies type broads cruiser had a prop shaft emergency. Everything fixed but... need a nut to fasten a flange back on. The old nut was so bad that it had to be cut off, so need a new one. It's 1" with 20tpi UNEF. So far not been able to find either a stockist or a manufacturer tooled up to make one. Anyone got any ideas?

BTW. Typical boatie thing. To take the shaft out (to replace with something more common) would involve destroying 2/3 of the boat. Not an option.

Thanks.

 

[VicS]

Any small machine shop should be able to make you one.

Sort of thing my Dad loved to do when he was alive.

Ive still got his lathe but sadly not the skill to offer to do it.

 

[crisjones]

Not a common thread at all, in fact mainly a US one.

Even so a small precision engineering company should have no problem making a one off, consult your local yellow pages to see who is local.

 

[maxi77]

A very quick google gives,

http://www.eastmidlandfastenercompany.co.uk/page6.html

I did assume you meant UNF though

 

[Nicholas123]

I think you've measured it incorrectly.Unless I am very much mistaken 1" UNF has 12 tpi.

 

[VicS]

1" UNF is 12 TPI

1" UNEF is 20 tpi

 

[Nicholas123]

1" UNF is 12 TPI

1" UNEF is 20 tpi

That's a new one on me.Where's UNEF come from then?

 

[colhel]

PM me and I'll make you one, I'll assume it's 60deg thread form I'll have to work out thread depth etc,not difficult (screw cutting) unless you have a male thread something I can try for size.

 

[theoldsalt]

OP and Vics are quite correct see thread chart.

http://www.ring-plug-thread-gages.com/PDChart/UNEF-thread-data.html


colhel,

Above info may be helpful to you if you are making one.

 

[Nicholas123]

Correction just seen someone says it comes from the US.

 

[colhel]

I think the E stands for extra

 

[halcyon]

Fellow boater with a seventies type broads cruiser had a prop shaft emergency. Everything fixed but... need a nut to fasten a flange back on. The old nut was so bad that it had to be cut off, so need a new one. It's 1" with 20tpi UNEF. So far not been able to find either a stockist or a manufacturer tooled up to make one. Anyone got any ideas?

This link gives spec of thread, so you should be able to get one machined

http://www.efunda.com/designstandards/screws/screwunef.cfm

There are some links to stockists that may also help.


Brian

 

[VicS]

That's a new one on me.Where's UNEF come from then?

First time I have actually heard of it too but its in my thread tables.
Smaller sizes appear to be used on ( some) track-rod ends

 

[colhel]

OP and Vics are quite correct see thread chart.

http://www.ring-plug-thread-gages.com/PDChart/UNEF-thread-data.html


colhel,

Above info may be helpful to you if you are making one.

I have ring and plug thread guages ,but doupt in this size. I think the cost would be prohibitive just for one nut. It's easy to work out the thread depth. A UNEF thread will be 60deg. 20 TPI would have its own depth, so this can be used whatever the diameter of the thread is.

 

[colhel]

UNEF . The E stands for Extra.

 

[pappaecho]

UNEF United Nations Extra Fine
I will phone a chandler locally, who keep wide range of threads and types, I have certainly got UNF nuts and bolts. I will ask. If they have I will PM you

 

[halcyon]

I have ring and plug thread guages ,but doupt in this size. I think the cost would be prohibitive just for one nut. It's easy to work out the thread depth. A UNEF thread will be 60deg. 20 TPI would have its own depth, so this can be used whatever the diameter of the thread is.

Thread spec is on link below.

Brian

 

[RobbieW]

UNEF United Nations Extra Fine

Unified EF surely ??

 

[maxi77]

1" UNF is 12 TPI

1" UNEF is 20 tpi

You learn something new every day, UNEF is a completely new one on me

 

[rob2]

Oh for goodness sake! Unified National Extra Fine. Strange to say, I believe that a 1" x 20 thread is used for antenna mounts, but I don't know whether it's this thread pattern. I would imagine that a suitable tap could be found in the States.

Rob.