Overall lengthThread length Thread+Neck lengthShank lengthShank dia.Size of squareLength of square
O STI SpiralPointed Taps forHelicalCoil Wire Screw LThread ℓInser ℓnts ℓsDsKℓk
SizeClassCodeChamferL (inch)ℓ (inch)ℓn (inch)ℓs (inch)Ds (inch)K (inch)ℓk (inch)No. of flutesType
STI 7/16-14UNCGH3 GH4PUU07Q3NEB PUU07Q4NEB5P4.3311.024-2.2050.4290.3220.533
STI 7/16-20UNFGH3 GH4PUU07N3NEB PUU07N4NEB5P4.3311.024-2.2050.4290.3220.533
STI 1/2-13UNCGH3 GH4PUU08R3NEB PUU08R4NEB5P4.3311.024-2.2050.4800.360.56233
STI 1/2-20UNFGH3 GH4PUU08N3NEB PUU08N4NEB5P4.3311.024-2.2050.4800.360.56233