mm 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 in 1 2 3 4 5 6 7 8 9 Copyright © 2000-2017 Bolt Depot Inc. IMPORTANT: Make sure to print this chart to Actual Size (no scaling). After printing, measure the ruler in the margin to ensure correct scale. US Hex Bolt Sizes and Thread Pitches www.boltdepot.com/tools See boltdepot.com/tools for more details. www.boltdepot.com/tools Length 1/4” - 20 #10 - 24 #8 - 32 #6 - 32 5/16” - 18 3/8” - 16 7/16” - 14 1/2” - 13 9/16” - 12 1/4” - 28 #10 - 32 5/16” - 24 3/8” - 24 7/16” - 20 1/2” - 20 9/16” - 18 Length is measured from under the head to the end of the bolt #4 - 40 9/16” 1/2” 7/16” 3/8” 5/16” 1/4” #10 #8 #6 #4 Coarse thread Fine thread Coarse thread Fine thread Coarse thread Fine thread Coarse thread Fine thread Coarse thread Fine thread Coarse thread Fine thread Coarse thread Coarse thread Coarse thread Coarse thread Fine thread