d1 d2 a G Machine nut taps Whitworth pipe thread G, DIN-ISO 228 NGRf 1 550 P HSS l1 l2 P M K Material groups N S H Hole type < 1,5d Quality of material HSS Coating Chamfer 12P Norma NGRf G Ć d1 1''/P P l1 l2 l 3 Ć d2 a Tol. INDEX F1-151001 G1/16 7,723 28 0,907 140 20 - 6,0 4,5 6,80 3121 G1/8 9,728 28 0,907 140 20 - 7,0 6,3 8,80 3123 G1/4 13,157 19 1,337 180 30 - 11,0 8,0 11,80 3127 G3/8 16,662 19 1,337 200 30 - 12,0 10,0 15,25 3129 G1/2 20,955 14 1,814 220 40 - 16,0 12,5 19,00 3131 G5/8 22,911 14 1,814 220 40 - 18,0 14,0 21,00 3133 G3/4 26,441 14 1,814 250 40 - 20,0 16,0 24,00 3135 G7/8 30,201 14 1,814 280 40 - 22,0 18,0 28,25 3137 G1 33,249 11 2,309 280 60 - 25,0 20,0 30,75 3139 G1.1/8 37,907 11 2,309 280 60 - 28,0 22,4 35,50 3141 - G1.1/4 41,910 11 2,309 280 60 - 32,0 25,0 39,50 3143 G1.3/8 44,323 11 2,309 280 60 - 32,0 25,0 42,00 3145 - G1.1/2 47,800 11 2,309 280 60 - 36,0 28,0 45,00 3147 G1.3/4 53,756 11 2,309 280 60 - 40,0 28,0 51,00 3151 - G2 59,614 11 2,309 280 60 - 45,0 31,5 57,00 3155 ISO Vc (m/min) P 5-20 M - K 6-15 N 6-15 S - Example of order Available from stock 80 F1-151001-3131 On request Tap G-1/2" NGRf HSS