Structural bolts are specifically designed for use with heavy hex nuts in the connection of structural members (as opposed to tapped holes). The nuts for structural connections shall conform to ASTM A563 or ASTM A194. The following …
This hexagonal headed fastener is designed to be screwed into a tapped (pre-threaded) hole or secured with a nut. The underside of these heads are washer faces and the point ends are chamfered. These are used in more specialized situations than hex bolts.
This is a high pressure and temperature grade nut made of medium carbon steel that has been quenched and tempered. This grade meets ASTM specification A 194. These nuts are also used in flanges and fittings as well as in heavy construction of buildings and bridges.
Galvanized nuts are intended for use with externally threaded fasteners that are hot-dip or mechanically galvanized or have a coating of sufficient thickness to require over-tapping of the nut to provide assembly.
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In developing this information, Fastenal has made a determined effort to present its contents accurately. Extreme caution should be used when using a formula for torque/tension relationships.