trlvn
Ultra Member
So, I've picked up box lots including taps from 3-4 auctions and I was sorting through them. Among the oddballs[1], one is particularly odd: it is marked "1/4-32 WF ENGLAND". There is a symbol like a cloverleaf on it.
At 32 tpi, it is so small I can't really say if the threads are 55 or 60 degrees. I'm guessing the "WF" means Whitworth Form or something similar.
I have a few BSW (British Standard Whitworth) taps but, AIUI, 1/4-32 is not a standard combination. I did find one reference to 1/4-32 on this web page:
https://www.tap-die.com/contents/en-uk/d297_Tap_Die_Company_Tapping_Drill_Sizes.html
It is in the "Model Engineer" column. Not sure how the "WF" could be related, though.
Anyway, just a curiosity.
Craig
[1] I've got about a dozen "NS" (National Special) taps which I understand are basically diameter/tpi combinations that aren't in UNC or UNF. For example, I've got taps for both 1/2-12 and 1/2-27! Also have a tap marked "USS" in 5/8-27. I understand USS basically is an older name for NS.
At 32 tpi, it is so small I can't really say if the threads are 55 or 60 degrees. I'm guessing the "WF" means Whitworth Form or something similar.
I have a few BSW (British Standard Whitworth) taps but, AIUI, 1/4-32 is not a standard combination. I did find one reference to 1/4-32 on this web page:
https://www.tap-die.com/contents/en-uk/d297_Tap_Die_Company_Tapping_Drill_Sizes.html
It is in the "Model Engineer" column. Not sure how the "WF" could be related, though.
Anyway, just a curiosity.
Craig
[1] I've got about a dozen "NS" (National Special) taps which I understand are basically diameter/tpi combinations that aren't in UNC or UNF. For example, I've got taps for both 1/2-12 and 1/2-27! Also have a tap marked "USS" in 5/8-27. I understand USS basically is an older name for NS.
