Carriage Bolts : Round Head, Ribbed Neck. - Length of a carriage bolt is measured from the underhead bearing surface to the extreme end of the bolt . -Tolerance on #10 through 1/2 sizes for nominal lengths of 7/8 and shorter shall be +.031 and -.000. • Dimensions: ASME B18.5: #8 is proprietary Full Diameter Body on product over 12” in length. Full or Reduced Diameter Body 6” thru 12” lengths (Reduced body diameter having a limit equal to the minimum pitch diameter) ** Exceptions: bolts less than or equal to … Portland Bolt manufactures carriage bolts from 1/2″ diameter through 1-1/4″ diameter in most ASTM, AASHTO, and SAE specifications. Special tooling can be created to produce nonstandard head dimensions, carriage bolts larger than 1″ in diameter, or bolt heads herepany’s name and/or logo. Cutting. Heading.

15 rows Round head carriage bolts are also referred to as round head square neck carriage bolts . … The square neck is designed to keep the bolt from turning as a nut is tightened. Best for use in wood or thick gauge sheet metal. Stock up on the right carriage bolt from Grainger to build strong wooden decks and other structures the right way every time. You might also want to grab a bolt assortment for backup, as well as the ideal style of U bolt to run piping for outdoor lighting and sound systems.