* Values are calculated for Length of engagement of 5xPitch. Closest Imperial Drill Size Closest Imperial Drill Size Closest Imperial Drill Size Closest Imperial M1.5 x 0.35 1.5 0.35 1.15 56 1.60 55 1. * Permisable values for thread Class 3B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.5169 - 0.5239 13.129 - 13.307 D 2 Pitch Diameter 0.5349 - 0.5385 13.586 - 13.678 D Major Diameter 0.5620 (Min) 14.275 (Min) α Varation of 30° anngle (+/-) 1.25 (Ref) 31.75 (Ref) P Varation of Pitch (+/-) 0.001 (Ref) 0.025 (Ref) Metric Tap Chart Tap Drill Clearance Drill Aluminum, Brass, Plastics Steel, Stainless Steel, Iron Close Fit. (UNR Only) 0.5124 (Ref) 13.015 (Ref) α Varation of 30° anngle (+/-) 1.25 (Ref) 31.75 (Ref) P Varation of pitch (+/-) 0.0008 (Ref) 0.02 (Ref) Tap size: NF/NC UNF/UNC: Threads per inch: Basic major dia (inches) Basic effective dia (inches) Basic minor dia of ext. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.5548 - 0.562 14.092 - 14.275 d 2 Pitch Diameter 0.5321 - 0.5349 13.515 - 13.586 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator
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