Overa lengtll h Thread lengthThread+Nec lengthk Shank dia.Size of squareLength of square
LℓnDsKℓk
ELX NI SP STI Spiral Fluted Taps for Nickel BaseAlloys, for HelicalCoilWire Screw ThreaN f d Inserts
SizeClassCodeChamferL (inch)ℓ (inch)ℓn (inch)Ds (inch)K (inch)ℓk (inch)o. o flutesType
STI 1/4-20UNCGH2 GH3Y87448 Y87458 Y870583P 1.5P2.7180.4721.1250.3180.2380.37533
STI 1/4-28UNFGH2 GH3Y87449 Y874593P2.7180.3941.1250.3180.2380.37533
STI 5/16-18UNCGH3 GH4Y87460 Y874703P2.9370.5511.250.3810.2860.43733
STI 5/16-24UNFGH2 GH3Y87451 Y87461 Y870613P 1.5P2.9370.3941.250.3810.2860.43733
STI 3/8-16UNCGH3 GH4Y87462 Y874723P3.3750.630-0.3670.2750.43734
STI 3/8-24UNFGH2 GH3Y87453 Y87063 Y874633P 1.5P 3P3.1560.472-0.3230.2420.40634
STI 7/16-14UNCGH3Y874643P3.5930.709-0.4290.3220.534
STI 7/16-20UNFGH3 GH4Y87465 Y874753P3.3750.472-0.3670.2750.43734
STI 1/2-13UNCGH3Y874663P3.8120.748-0.4800.360.56234
STI 1/2-20UNFGH3Y87467 Y870673P 1.5P3.5930.512-0.4290.3220.534