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Standard System of Tap Marking<br />
Thread Form Symbols<br />
*UN<br />
*UNC<br />
*UNF<br />
*UNEF<br />
UNJ<br />
UNJC or<br />
UNJF<br />
UNM<br />
UNR<br />
UNRC or<br />
UNRF<br />
*UNS<br />
V<br />
WHIT<br />
Unified Constant Pitch Thread Series<br />
Unified Coarse Thread Series<br />
Unified Fine Thread Series<br />
Unified Extra Fine Thread Series<br />
Unified Thread Series with a 0.15011P to 0.18042P. Controlled Roil Radius on External<br />
Thread only.<br />
Unified Thread Coarse or Fine Series with a 0.15011P to 0.18042P Controlled Root Radius<br />
on External Thread only.<br />
Unified Miniature Thread Series<br />
Unified Constant Pitch Thread Series with a 0.108P to 0.144P Controlled Root Radius;<br />
External Thread only<br />
Unified Constant Pitch Coarse or Fine Thread Series with a 0.108P to 0.144P Controlled<br />
Root Radius; Ext. Thread only<br />
Unified Thread Special<br />
60º thread with Truncated Crest and Root. The theoretical "V" Form is usually flatted to<br />
the user's specifications.<br />
British Standard Whitworth Special Thread<br />
*Taps are not marked with "U" but with the symbol for the corresponding American Standard Thread<br />
form with which it is compatible.<br />
V 1.0 – November 2011 Page 173
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