Knob: Aluminum Ferrule: Hardened carbon steel, zinc plate 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 A ±0.1 Min.Sheet Thickness Hole Size In Sheet +0.08 C Max. E ±0.25 G ±0.64 T1 ±0.2 T2 Nom. Driver Size Unified Metric Unified Metric .112-40(#4-40) M3X0.5 PF21 440 M3 0 0.97 1 5.55 5.53 10.5 4 12.3 11.5 #1 1 5.7 14 2 7.2 15.5 3 8.8 17.1 .112-40(#4-40) M3X0.5 PF22 440 M3 0 1.47 1.5 5.55 5.53 10.5 4 12.3 11.5 #1 1 5.7 14 2 7.2 15.5 3 8.8 17.1 .138-32(#6-32) M3.5X0.6 PF21 632 M3.5 0 0.97 1 6.35 6.33 11.5 5.3 16.4 15.9 #2 1 6.9 18 2 8.5 19.6 3 10.1 21.2 .138-32(#6-32) M3.5X0.6 PF22 632 M3.5 0 1.47 1.5 6.35 6.33 11.5 5.3 16.4 15.9 #2 1 6.9 18 2 8.5 19.6 3 10.1 21.2 .164-32(#8-32) M4X0.7 PF21 832 M4 0 0.97 1 7.90 7.88 13 5.6 16.9 16.2 #2 1 7.2 18.5 2 8.7 20 3 10.3 21.6 .164-32(#8-32) M4X0.7 PF22 832 M4 0 1.47 1.5 7.90 7.88 13 5.6 16.9 16.2 #2 1 7.2 18.5 2 8.7 20 3 10.3 21.6 .190-32(#10-32) M5X0.8 PF21 032 M5 0 0.97 1 7.90 7.88 13 5.6 16.9 16.2 #2 1 7.2 18.5 2 8.7 20 3 10.3 21.6 .190-32(#10-32) M5X0.8 PF22 032 M5 0 1.47 1.5 7.90 7.88 13 5.6 16.9 16.2 #2 1 7.2 18.5 2 8.7 20 3 10.3 21.6 .250-20(1/4-20) M6X1 PF21 0420 M6 0 0.97 1 9.5 9.47 14.7 7.1 20.5 20 #3 1 8.7 22.1 2 10.3 23.7 3 11.9 25.3 .250-20(1/4-20) M6X1 PF22 0420 M6 0 1.47 1.5 9.5 9.47 14.7 7.1 20.5 20 #3 1 8.7 22.1 2 10.3 23.7 3 11.9 25.3