Knob: Aluminum Ferrule: Aluminum Screw: 300 Series Stainless Steel Spring: 300 Series Stainless Steel All dimensions are in millimeters (Size Unit: mm) METRIC Thread Size Type Thread Code Shank Code L Nom. Sheet Thickness A Min-Max C ±0.06 E ±0.25 G ±0.4 T1 ±0.2 T2 Nom. B Nin. D +0.08 N ±0.25 M Nin. Driver Size Unified Metric Unified Metric .112-40(#4-40) M3X0.5 PF51 PF16 440 M3 0 3.4 0-1.6 4.9 10.5 5.1 13.8 11.9 2.8 6.4 7.8 9.4 #1 1 6.6 15.3 2 8.2 16.9 .112-40(#4-40) M3X0.5 PF52 PF26 440 M3 0 4.2 1.6-2.5 4.9 10.5 6.6 15.3 11.9 3.6 6.4 7.8 9.4 #1 1 8.2 16.9 .138-32(#6-32) M3.5X0.6 PF51 PF16 632 M3.5 0 3.7 0-1.6 5.7 11.5 7.2 17.8 15.4 2.9 7.2 8.6 10.3 #2 1 8.8 19.4 2 10.4 21 .138-32(#6-32) M3.5X0.6 PF52 PF26 632 M3.5 0 4.5 1.6-2.5 5.7 11.5 8.8 19.4 15.4 3.7 7.2 8.6 10.3 #2 1 10.4 21 .164-32(#8-32) M4X0.7 PF51 PF16 832 M4 0 4 0-1.6 7.3 13 7.3 18.5 16.2 3.1 8.8 10.2 12 #2 1 8.8 20 2 10.4 21.8 .164-32(#8-32) M4X0.7 PF52 PF26 832 M4 0 4.8 1.6-2.5 7.3 13 8.8 20 16.2 3.9 8.8 10.2 12 #2 1 10.4 21.6 .190-32(#10-32) M5X0.8 PF51 PF16 032 M5 0 4 0-1.6 7.3 13 7.3 18.5 16.2 3.1 8.8 10.2 12 #2 1 8.8 20 2 10.4 21.8 .190-32(#10-32) M5X0.8 PF52 PF26 032 M5 0 4.8 1.6-2.5 7.3 13 8.8 20 16.2 3.9 8.8 10.2 12 #2 1 10.4 21.6 .250-20(1/4-20) M6X1 PF51 PF16 0420 M6 0 4 0-1.6 8.9 14.7 8.8 22.1 20 3.3 10.5 11.9 13.5 #3 1 10.4 23.7 2 12 25.3 .250-20(1/4-20) M6X1 PF52 PF26 0420 M6 0 4.8 1.6-2.5 8.9 14.7 10.4 23.7 20 4.1 10.5 11.9 13.5 #3 1 12 25.3