YMW 3/8-16 Roll Form Tap 2-2-1/2 Lead Manufacture YMW Mfg Part Number 388486 Size ( US ) Thread Limit H5 Number of Lobe Grooves 1 Chamfered Bottom Lead 2 to 2-1/2 Finish/Coating Nitride Material Vanadium High Speed Steel Oversize (Yes/No) No Length of Thread .945 Overall Length (Inch) 3.937 Thread Standard.