Spiral Fluted Tap Overall Thread Thread+Neck Shank Shank Size of Length of length length length length dia. square square L ℓ ℓn ℓs Ds K ℓk Spiral Fluted Taps (for blind hole) SP Spiral Fluted Taps for Alloy Steels Spiral Fluted Taps (for through hole) Specification ■Spiral Fluted Taps suitable for Alloy Steels and High E Carbon Steels. Due to improvement of chip ejection and Oxide reduction of tapping torque, SP is optimal for blind hole 1 1/8U ~ tapping of larger diameter. Spiral Pointed Taps (for through hole) Recommended Tapping Speed depending on Materials High carbon steels Alloy steels 3〜8 3〜8 For icon explanation, refer to P.50 Hand Taps TYPE:1 Cemented Carbide Taps Roll Taps Segment:1C 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 SSU16XYEEXJ 2.5P 6.299 1.457 - 3.228 0.8 0.6 0.812 4 1 Pipe Taps Simple Inspection Tools 1 1/8-8UN 2BX SSU18XYEEXJ 2.5P 7.087 1.732 - 3.622 0.896 0.672 0.875 4 1 1 1/4-8UN 2BX SSU20XYEEXJ 2.5P 7.087 1.929 - 3.622 1.021 0.766 1 4 1 1 3/8-8UN 2BX SSU22XYEEXJ 2.5P 7.874 2.165 - 4.016 1.108 0.831 1.062 4 1 1 1/2-8UN 2BX SSU24XYEEXJ 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-9 196