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Standard thread 3/4 -16 UNF

Standard thread 3/4 -16 UNF

Standard thread 3/4 -16 UNF

(OP)
I have a drawing which says to measure 3/4-16UNC-2A . I believe we do not have such call out in unified screw threads standard, it should be 3/4-16unf or 3,4-10unc.please suggest.

RE: Standard thread 3/4 -16 UNF

I would say 3/4-16 UNF  it was probably a slip of the mouse and or keyboard.  Been there done that one before.  Do you have a cad file?  Measure the hidden line and see if the minor match more of the 3/14 16 or the 3/4-10.  Or look at the thread relief diameter.  What makes sense at that diameter under the head of the screw.

RE: Standard thread 3/4 -16 UNF

I'd ask your customer.  Never try to second guess an error.

RE: Standard thread 3/4 -16 UNF

Good One never assume anything  

RE: Standard thread 3/4 -16 UNF

Ask your customer, however if in this case you can't, historically I've found the thread dia & pitch to be specified more accurately than the thread family because, well, 1/2 the people specifying them don't know the difference between a UN, UNF, UNC, UNEF, UNS...

Posting guidelines FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm? (probably not aimed specifically at you)
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RE: Standard thread 3/4 -16 UNF

Kenat, you are being too kind with your "1/2 the people" comment. Maybe it should be 3/4 of the people.
 

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