H means (high) above basic pitch diameter and L (low) below basic pitch diameter. Numeral Equivalent Charts Tool Applications with Steve Specials About Us Contact Us Menu Abrasion Products. FORMING TAPS SPIRAL FLUTE TAPS SCREW THREAD INSERT TAPS SPIRAL POINT TAPS PIPE TAPS STRAIGHT FLUTE TAPS TECHNICAL DATA 9 STI STRAIGHT TAP DIMENSION Nominal Size (STI) Threads per Inch Overall Length Thread Length Shank Diameter Square Length Square Size Blank Design No. This is the matter of the H and L pitch diameter tap limits. H is equal to insert nominal length +1 Pitch. Special Taps Contact H-Limits In addition to the nominal size and pitch of tap, there is another important dimensional factor to be considered in selecting a ground thread tap for a given job. Formulas produce threads depending on the workpiece material. Tap Drill Sizes for Forming Taps REFERENCE Inch Tap Size Drill Size Decimal Equivalent Percentage of Thread 0 80 1.35mm 0.0531 75 1 64 1.65mm 0.0650 75. Formulas produce threads depending on the workpiece material. Tap Drill Size Tap Basic Major Diameter - (Pitch ÷ 2) Drill Size Major Diameter - (0.0068 x desired of thread) ÷Threads per Inch Drill Size (mm) Major Diameter - 0.0068 x desired of thread x pitch (mm) ÷ 147.06. Tap Drill Size Tap Basic Major Diameter - (Pitch 2) Drill Size Major Diameter - (0.0068 x desired of thread) Threads per Inch Drill Size (mm) Major Diameter - 0.0068 x desired of thread x pitch (mm) 147.06. Calculating Tap Drill Sizes for Forming Taps. Features Available In Sizes Up To 39Mm Used For General Hand And Machine Tapping Operations. Calculating Tap Drill Sizes for Forming Taps. Shown below (Dimension H) are the MINIMUM for countersunk holes and insert set-down of 1-1/2 HELI-COIL Screw Thread Insert STI Tap: M4x0.7 Thread Size.
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