There is also a printable version that has both metric and inch threads. * Values are calculated for Length of engagement of 5xPitch. This tap and clearance drill chart shows tap and clearance drill sizes for standard threads. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.6776 - 0.687 17.211 - 17.45 d 2 Pitch Diameter 0.643 - 0.6464 16.332 - 16.419 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator * Values are calculated for Length of engagement of 5xPitch.
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