Overall Thread Thread+Neck Shank Shank Size of Length of length length length length dia. square square L ℓ ℓn ℓs Ds K ℓk LO-SP (for blind hole) Spiral Fluted Taps Low Spiral Fluted Taps for Alloy Steels Specification (for through hole) Spiral Fluted Taps ■Low Spiral Fluted Taps suitable for Alloy Steels and High E Carbon Steels. Due to improvement of chip ejection and Oxide reduction of tapping torque, LO-SP is optimal for blind hole 1 1/8U ~ tapping of larger diameter. Recommended Tapping Speed depending on Materials (for through hole) Spiral Pointed Taps High carbon steels Alloy steels 3〜8 3〜8 For icon explanation, refer to P.50 TYPE:1 Hand Taps Carbide Taps Cemented Segment:1C Roll Taps Size Class Code Chamfer L ℓ ℓn ℓs Ds K ℓk No. of Type (inch) (inch) (inch) (inch) (inch) (inch) (inch) flutes For Unified Threads 1-8UNC 2BX SSU16XYEEXHT 2.5P 6.299 1.457 - 3.228 0.8 0.6 0.812 4 1 1 1/8-8UN 2BX SSU18XYEEXHT 2.5P 7.087 1.732 - 3.622 0.896 0.672 0.875 4 1 Simple Inspection Tools Pipe Taps 1 1/4-8UN 2BX SSU20XYEEXHT 2.5P 7.087 1.929 - 3.622 1.021 0.766 1 4 1 1 3/8-8UN 2BX SSU22XYEEXHT 2.5P 7.874 2.165 - 4.016 1.108 0.831 1.062 4 1 1 1/2-8UN 2BX SSU24XYEEXHT 2.5P 7.874 2.323 - 4.016 1.233 0.925 1.125 4 1 Thread Mills Dies Center Drills Centering Tools ANSI SP-10 197