![]() ![]() * Values are calculated for Length of engagement of 5xPitch. * Permisable values for thread Class 2B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.508 - 0.519 12.903 - 13.183 D 2 Pitch Diameter 0.5295 - 0.5347 13.449 - 13.581 D Major Diameter 0.5620 (Min) 14.275 (Min) α Varation of 30° anngle (+/-) 1.1667 (Ref) 29.634 (Ref) P Varation of Pitch (+/-) 0.0015 (Ref) 0.038 (Ref) Drill the hole to the specified embedment depth plus minimum hole depth overdrill (see table below) to allow the thread tapping dust to settle, and blow it. To get the tap drill size in other depths, use our Tap Drill Size Calculator. You can learn more about thread depth in tapping here. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.5539 - 0.562 14.069 - 14.275 d 2 Pitch Diameter 0.5265 - 0.5295 13.373 - 13.449 d 3 Minor Diameter ![]() For calculations of different engagement length use the Thread Calculator ![]() Energy news covering oil, petroleum, natural gas and investment. * Values are calculated for Length of engagement of 5xPitch. Oil price charts for Brent Crude, WTI & oil futures. ![]()
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