While an STI tap does differ from a standard thread cutting. The STI tap is then used to create the proper threads in the piece. The recommended drill is utilized to open the hole to the correct minor diameter. * Values are calculated for Length of engagement of 5xPitch. When preparing a hole to accept a Heli-Coil ® wire screw thread insert, a Screw Thread Insert or STI tap is used to prepare the hole. * Permisable values for thread Class 2B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.0849 - 0.0948 2.156 - 2.408 D 2 Pitch Diameter 0.0958 - 0.0991 2.433 - 2.517 D Major Diameter 0.1120 (Min) 2.845 (Min) α Varation of 30° anngle (+/-) 1.75 (Ref) 44.45 (Ref) P Varation of Pitch (+/-) 0.001 (Ref) 0.025 (Ref) Numeral Equivalent Charts Tool Applications with Steve Specials About Us Contact Us Menu Abrasion Products. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.1069 - 0.112 2.715 - 2.845 d 2 Pitch Diameter 0.0939 - 0.0958 2.385 - 2.433 d 3 Minor Diameter The forming action creates heat and can work harden the material being formed. Speed Roll form taps should be run at 1-1/2 to 2 times the speed of a cut thread tap for a given material. Press down and turn the tap inside the hole and then the tap cuts the thread. 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. When preparing a hole to accept a Heli-Coil ® wire screw thread insert, a Screw Thread Insert or STI tap is used to prepare the hole. Ensure that the tap is positioned in a perpendicular direction to the hole. Now, place the tip of tap inside the hole. Next, on the top of the holder, position the square and tighten it. For calculations of different engagement length use the Thread Calculator Just as important, rolled threads are stronger than cut threads because the metal grains are deformed along the thread contours. For this, look at the tap drill chart to find the correct size and start drilling. * Values are calculated for Length of engagement of 5xPitch. H means (high) above basic pitch diameter and L (low) below basic pitch diameter. This is the matter of the H and L pitch diameter tap limits. (UNR Only) 0.0815 (Ref) 2.07 (Ref) α Varation of 30° anngle (+/-) 1.75 (Ref) 44.45 (Ref) P Varation of pitch (+/-) 0.0007 (Ref) 0.018 (Ref) 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. * Permisable values for thread Class 2A # Description Value (Inch) Value (mm) es Allowance 0.0008 (Ref) 0.02 (Ref) d Major Diameter 0.1061 - 0.1112 2.695 - 2.824 d 2 Pitch Diameter 0.0925 - 0.095 2.35 - 2.413 d 3 Minor Diameter
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