Transcription of TTap Drill Sizes for Forming Tapsap Drill Sizes for ...
1 Tap Drill Sizes for Forming Taps TAP Drill Sizes . FOR Forming TAPS. inch METRIC. Tap Drill Decimal Percentage Size Size Equivalent of Thread Tap Drill Decimal Percentage 0-80 mm 75 Size Size Equivalent of Thread 1-64 mm 75 M3 x 7/64 65. 1-72 mm 75 x 75. 1-72 mm 65 M4 x 27 70. 1-72 51 60 x 80. 2-56 mm 75 M5 x 75. 2-56 5/64 65 M6 x 1 75. 2-56 47 60. M7 x 1 75. 2-64 5/64 75. M8 x L 75. 2-64 47 70. 2-64 mm 65 M8 x 1 75. 3-48 mm 75 M10 x 75. 3-48 43 70 M10 x U 75. 3-48 mm 60 M12 x 7/16 75. 3-56 43 75 M12 x 75. 3-56 mm 65 M14 x 2 75. 4-40 mm 75. M14 x 75. 4-40 39 70. M16 x 2 75. 4-40 38 60. 4-48 38 70 M16 x 75. 4-48 mm 65 M18 x 75. 5-40 34 75 M18 x 75. 5-40 33 70 M20 x 47/64 80.
2 5-40 mm 60 M20 x 75. 5-44 33 75. 5-44 mm 70 Non-standard Drill Sizes - reaming of the hole may 6-32 mm 75 be necessary. 6-32 1/8 60. 6-40 1/8 75. 6-40 mm 70. 8-32 25 75. 8-32 mm 70. 8-32 mm 65 PRACTICAL FORMULA - inch Sizes . 8-36 25 75. 8-36 mm 70 TO ESTABLISH TAP Drill Sizes FOR inch SIZE ROLL Forming TAPS. 8-36 24 60. 10-24 mm 75 (.0068 x % of Thread Desired). TAP Drill SIZE = Basic Tap . 10-24 18 70 Threads Per inch 10-24 11/64 65. 10-32 17 75 (.0068 x 65). 10-32 16 60 (EXAMPLE 1/4-20 Tap with 65% Thread) = .250 20 = .228 Dia. 12-24 10 75. 12-24 9 70. 12-24 mm 65. 12-24 8 60. 12-28 mm 75. 12-28 8 70. 12-28. 1/4-20. 7. mm 60. 75. PRACTICAL FORMULA - METRIC Sizes .
3 1/4-20 1 65 TO ESTABLISH TAP Drill Sizes FOR METRIC SIZE ROLL Forming TAPS. 1/4-28 mm 75. 1/4-28 A 65 (% of Thread Desired x mm Pitch). 1/4-28 15/64 60 TAP Drill SIZE = Basic Tap (mm) 5/16-18 mm 75. 5/16-18 mm 70 (65 x ). 5/16-18 mm 65 (EXAMPLE M8 x Tap with 65% Thread) = 8 . 5/16-18 L 60. = mm Dia. REFERENCE. 5/16-24 mm 75. 5/16-24 mm 60. 3/8-16 mm 70. 3/8-16 mm 65. 3/8-24 mm 70. 3/8-24 T 60 APPLICATION. 7/16-14 Y 65. 7/16-20 mm 70. Forming Taps cold form threads in ductile materials such as brass, copper, 1/2-13 mm 65. 1/2-20 mm 75 aluminum and leaded steels as well as series 301 to 347 stainless steels. Thread 9/16-12 mm 75 size can be maintained closely since taps have no cutting edges.
4 Unusually smooth 9/16-18 mm 75 threads can be formed throughout the full depth of the holes. 5/8-11 37/64 75. 5/8-11 mm 70. 5/8-18 19/32 75. 5/8-18 mm 65. 3/4-10 45/64 65. 3/4-16 23/32 70. H4.
