mm 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 in 230 1 2 3 4 5 6 7 8 9 Copyright 2000-2017 Bolt Depot Inc. IMPORTANT: The size of the head varies with the size of the machine bolt . Since it is externally wrenched, sufficient space around the head must be allowed for wrench clearance. Tables 1 and 2 list head width across flats, which is wrench size , and across corners, head height and minimum threaded length. Machine bolts are available in Grade 2. Our printable 'lay-over' sizing chart for identifying US machine screw diameter and thread count. Metric Machine Screw Diameter and Thread Chart Our printable 'lay-over' sizing chart for identifying metric machine screw diameter and thread pitch.

Hex Bolts , Hex Machine Bolts , Square Head Machine Bolts at InStock Fasteners - The low-price easy-to-use source for industrial and construction fasteners. Machine Screws. 78. L. L. Axis of screw thread . Basic major diameter Minor diameter Basic pitch diameter . Thread Dimensions . a. Tensile strength values are based on 60,000 psi. and apply to carbon steel screws and SEMS only. Machine Screw Size Chart and Conversion Tables A #8 screw size is .164 fraction of an inch. The diameters listed in the chart below are in fractions of an inch, so the #12 is just shy of 1/4 inch.