Desired thread size and of full thread are input. * Values are calculated for Length of engagement of 5xPitch. Calculations are done according to roll form tap drill charts which are given in the Machinerys Handbook. Reaming helps control hole size but is not required. A slimmer hood shape works more comfortably with a wider range of hand sizes, while unidirectional carbon brake levers offer a stiffer feel. Tap Chart Helicoil Threads - provides tap sizes and drill sizes for Helicoil threads. * Permisable values for thread Class 3B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.8209 - 0.8287 20.851 - 21.049 D 2 Pitch Diameter 0.8425 - 0.8466 21.4 - 21.504 D Major Diameter 0.8750 (Min) 22.225 (Min) α Varation of 30° anngle (+/-) 1.1667 (Ref) 29.634 (Ref) P Varation of Pitch (+/-) 0.0012 (Ref) 0.03 (Ref) Straight pipe threads can be form tapped using only a high quality drilled hole. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.8669 - 0.875 22.019 - 22.225 d 2 Pitch Diameter 0.8393 - 0.8425 21.318 - 21.4 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator * Values are calculated for Length of engagement of 5xPitch. Heli-Coil drilling data - inch INCH - DRILLED HOLE DIMENSIONS Nominal Suggested Drill Size Thread size Aluminum Steel,Magnesium,Plastic UNIFIED COARSE 1 (.073)-64 47 (.0785) 46 (. Drill HT 800 WP Grooving Gun Drill EB80 Gun Drill EB100 Gun Drill EB800 Gun Drill ZB80 End Mill Tap Reamer Stepped Reamer View all. * Permisable values for thread Class 2A # Description Value (Inch) Value (mm) es Allowance 0.0013 (Ref) 0.033 (Ref) d Major Diameter 0.8656 - 0.8737 21.986 - 22.192 d 2 Pitch Diameter 0.837 - 0.8412 21.26 - 21.366 d 3 Minor Diameter Get high-quality STI taps for precise and efficient threading.
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