* Values are calculated for Length of engagement of 5xPitch. * Permisable values for thread Class 3B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.1959 - 0.2067 4.976 - 5.25 D 2 Pitch Diameter 0.2175 - 0.2211 5.525 - 5.616 D Major Diameter 0.2500 (Min) 6.35 (Min) α Varation of 30° anngle (+/-) 1.1667 (Ref) 29.634 (Ref) P Varation of Pitch (+/-) 0.0011 (Ref) 0.028 (Ref) Find threading formulas and definitions to calculate cutting speed, feed rate or any other lathe machining parameters for your thread turning, thread milling or tapping operations. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.2419 - 0.25 6.144 - 6.35 d 2 Pitch Diameter 0.2147 - 0.2175 5.453 - 5.525 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator For processing of grey and nodular cast iron.
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