YMW 4-40 Roll Form Tap 2-2-1/2 Lead Manufacture YMW Mfg Part Number 388421 Size ( US ) Thread Limit H3 Number of Lobe Grooves 0 Chamfered Bottom Lead 2 to 2-1/2 Finish/Coating Nitride Material Vanadium High Speed Steel Oversize (Yes/No) No Length of Thread .433 Overall Length (Inch) 2.205 Thread Standard.