Technical Description of productsInformation 14. Tap, Thread Limits ■ for Unified Threads Unit:mm MajorDiameterPitch Diameter MinorDiameter MajorDiameterPitch Diameter MinorDiameter Size Class Basic Upper LowerBasicTolerance ToleranceBasicSize Class Basic Upper LowerBasicToleranceToleranceBasic Size Size ( μ m) ( μ m) Size Size Size ( μ m) ( μ m) Size + + + + P2 40 20 P3 60 40 G5 64 51 5/16 - 18 UNC 2B 7.938 7.021 49 23 6.411 No. 6 - 32 UNC 3.505 2.990 2.647 2B 38 18 GH1 12.7 0 GH1 12.7 0 P2 40 20 P2 40 25 5/16 - 24 UNF 2B 7.938 7.249 46 20 6.792 G5 64 51 GH1 12.7 0 No. 6 - 40 UNF 3.505 3.094 2.817 2B 36 16 P2 40 20 5/16 - 32 UNEF 7.938 7.422 7.079 GH1 12.7 0 2B 44 18 P2 40 20 P3 60 40 G6 76 64 3/8 - 16 UNC 2B 9.525 8.494 53 25 7.805 No. 8 - 32 UNC 4.166 3.650 3.307 2B 39 18 GH1 12.7 0 GH1 12.7 0 P3 60 40 P2 40 20 3/8 - 24 UNF 2B 9.525 8.837 48 20 8.379 G5 64 51 GH2 25.4 12.7 No. 8 - 36 UNF 4.166 3.708 3.401 2B 38 17 P2 40 20 3/8 - 32 UNEF 9.525 9.009 8.666 GH1 12.7 0 2B 46 18 P2 40 20 P3 60 40 G6 76 64 7/16 - 14 UNC 2B 11.112 9.934 56 27 9.149 No. 10 - 24 UNC 4.826 4.138 3.680 2B 42 20 GH1 12.7 0 GH1 12.7 0 P3 60 40 P2 40 20 7/16 - 20 UNF 2B 11.112 10.287 51 22 9.738 G5 64 51 GH1 12.7 0 No. 10 - 32 UNF 4.826 4.310 3.967 2B 40 18 7/16 - 28 UNEF P2 11.112 10.523 40 20 10.130 GH1 12.7 0 P3 60 40 P2 40 20 1/2 - 13 UNC 2B 12.700 11.430 58 28 10.584 No. 12 - 24 UNC 2B 5.486 4.798 43 20 4.341 GH1 12.7 0 GH1 12.7 0 P3 60 40 P2 40 20 1/2 - 20 UNF 2B 12.700 11.874 52 23 11.326 No. 12 - 28 UNF 2B 5.486 4.897 42 19 4.503 GH1 12.7 0 GH1 12.7 0 1/2 - 28 UNEF P2 12.700 12.111 40 20 11.717 No. 12 - 32 UNEF P2 5.486 4.971 40 20 4.627 P3 60 40 P2 40 20 9/16 - 12 UNC 2B 14.288 12.913 60 29 11.996 G7 89 76 GH3 38.1 25.4 1/4 - 20 UNC 6.350 5.524 4.976 2B 46 22 P3 60 40 GH1 12.7 0 9/16 - 18 UNF 2B 14.288 13.371 54 23 12.761 P2 40 20 GH2 25.4 12.7 G6 76 64 9/16 - 24 UNEF P2 14.288 13.599 40 20 13.142 1/4 - 28 UNF 6.350 5.761 5.367 2B 43 19 GH1 12.7 0 P2 40 20 1/4 - 32 UNEF 6.350 5.834 5.491 2B 42 18 Technical-29