* Values are calculated for Length of engagement of 5xPitch. Thread Depth Tap Drill Size (Inch) Tap Drill Size (mm) 55: 0.824: 20.93: 60: 0. A tap drill chart is key in matching pairs of female and male thread that tightly secure together. To get the tap drill size in other depths, use our Tap Drill Size Calculator. Tap Drill Charts 23 Printable Tap Drill Charts PDF A drill and tap chart is what specifies the right size of drill bit that one can use to create the correct sized opening that would complement tap dimensions. Machining Calculators Raw Materials Carbide Grades Machining Charts Glossary G Code Home Login / Register Search for. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 1.9886 - 2 50.51 - 50.8 d 2 Pitch Diameter 1.9416 - 1.9459 49.317 - 49.426 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator
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