WF thread..

[MWParticipant @mw27036]

I found an old tap and die with just "WF" written on it, along side the TPi and dia.

What does it mean?

Thanks

Michael W

[MWParticipant @mw27036]

[EmgeeParticipant @emgee]

Firm or owner's initials ?

Emgee

[John Stevenson 1Participant @johnstevenson1]

Whitworth Form

[HacksawParticipant @hacksaw]

   whitworth fred       if it come from London !

 

I've got a 2" square die with R stamped on it … A 99 year old guy , who if still alive would be 110 gave it to me

Said it was his fathers who worked on the railways… Railway thread ?

Edited By Hacksaw on 07/01/2017 14:40:31

[Brian HParticipant @brianh50089]

I have a number of taps and dies with WF on them and it stands for Whitworth Fine.

Brian

[MWParticipant @mw27036]

Thanks, I tried searching for it but nothing came up.

Hopefully my forum thread title will  come up as a close result on a search engine to help others as well.

Michael W

Edited By Michael-w on 07/01/2017 15:52:14

[John Stevenson 1Participant @johnstevenson1]

It's definitely Whitworth Form.

I have some taps here 2" x 4.5 tpi, clearly marked WF and no way is 4.5 tpi classed as fine thread.

[Ian S CParticipant @iansc]

2" x 4.5 is BSW, 2 x 7 is BSF, so WF Whiworth Form is my vote.

Ian S C

[not done it yetParticipant @notdoneityet]

Perhaps the OP might have listed the diameter and pitch at the beginning? Much less obscure discussion and more sensible outcome in fewer guesses (or without any) from the members. I expect JS is correct.

[MWParticipant @mw27036]

It's 1/8 x 32tpi I think.. I was satisfied with JS's answer from the start. Whitworth form, makes complete sense. Thanks for the help.

[JAParticipant @ja]

The term Whitworth form suggests that there was another thread form in general use at the time or earlier.

JA

[JasonBModerator @jasonb]

1/8" whit is usually 40tpi, so may not be a Whit thread but a 55degree thread so could be 1/8 x 32 ME.

[MWParticipant @mw27036]

Posted by JasonB on 08/01/2017 13:19:47:

1/8" whit is usually 40tpi, so may not be a Whit thread but a 55degree thread so could be 1/8 x 32 ME.

That sounds like I got a lucky find, so does ME have a common form with whitworth?

Michael W

[CirclipParticipant @circlip]

Posted by not done it yet on 08/01/2017 12:04:05:

Perhaps the OP might have listed the diameter and pitch at the beginning? Much less obscure discussion and more sensible outcome in fewer guesses (or without any) from the members. I expect JS is correct.

 

Why make life difficult when with a bit of extra effort you can make it abso bl***y lutely impossible.

 

Regards Ian.

 

 WhitworF

Edited By Circlip on 08/01/2017 14:31:36

[John Stevenson 1Participant @johnstevenson1]

Posted by JA on 08/01/2017 12:46:15:

The term Whitworth form suggests that there was another thread form in general use at the time or earlier.

JA

Oh but there was.

Every engineering concern had their own, even to the extent that one nut would only fit one bolt.

Whitworth was the first to standardise the thread system and so anything marked WF denoted it was to a standard.

[Ian S CParticipant @iansc]

The model engineers thread was BSEF/extra fine, there is a parallel to this in USA, the UNEF.

Ian S C

[Rick Kirkland 1Participant @rickkirkland1]

Thank Goodness for the wisdom and accurate knowledge of John Stevenson. As I said in another thread on here there are too many with very little true knowledgeof anything. I sometimes wonder if John gets as angry as I do reading some of the stuff that gets posted. I also know someone who maintains that AF on any spanner next to the size stamping means American Fine. I truly despair.

Edited By Rick Kirkland 1 on 09/01/2017 10:48:46

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Michael-w on 08/01/2017 14:07:18:

… so does ME have a common form with whitworth?

Michael W

.

Yes … or, to put it more correctly: the ME threads are 'Whitworth Form'

MichaelG.

[Author]

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