Overall length Thread lengthThread+Neck lengthShank dia.Size of squareLength of square
L ℓℓnDsKℓk

ZELX ALS SP Spiral Fluted Taps for Aluminum

SizeClassCodeChamferL (inch)ℓ (inch)ℓn (inch)Ds (inch)K (inch)ℓk (inch)No. of flutesType
5/16-18UNCGH3Y864122.5P3.5430.8661.3780.3180.2380.37532
5/16-24UNFGH3Y864142.5P3.5430.8661.3780.3180.2380.37532
3/8-16UNCGH3 GH5Y86416 Y864172.5P3.9370.9451.5350.3810.2860.43732
3/8-24UNFGH3Y864182.5P3.5430.7871.5350.3810.2860.43732
7/16-14UNCGH3Y864202.5P3.9370.945-0.3230.2420.40633
7/16-20UNFGH3Y864222.5P3.9370.945-0.3230.2420.40633
1/2-13UNCGH3Y864242.5P4.3311.142-0.3670.2750.43733
1/2-20UNFGH3Y864262.5P3.9370.866-0.3670.2750.43733