O lverall engthThread length Thread+Neck lengthShank lengthShank dia.Size of squareLength of square
OOXSTISpiral Pointed Tapsfor Helical Coil Wire Sc Lrew Th ℓread ℓnInserts ℓs, Oxi Dsded Kℓk
SizeClassCodeChamferL (inch)ℓ (inch)ℓn (inch)ℓs (inch)Ds (inch)K (inch)ℓk (inch)No. of flutesType
STI 7/16-14UNCGH3 GH4PUU07Q3NEX PUU07Q4NEX5P4.3311.024-2.2050.4290.3220.533
STI 7/16-20UNFGH3 GH4PUU07N3NEX PUU07N4NEX5P4.3311.024-2.2050.4290.3220.533
STI 1/2-13UNCGH3 GH4PUU08R3NEX PUU08R4NEX5P4.3311.024-2.2050.4800.360.56233
STI 1/2-20UNFGH3 GH4PUU08N3NEX PUU08N4NEX5P4.3311.024-2.2050.4800.360.56233