Grade 5 Hex Bolt: The hex head bolt has the six sided hexagonal shaped head. This is a machine threaded bolt typically used with a nut or in a pre-threaded hole. The Grade 5 bolt can be distinguished by the 3 dashes (l) on top of the head of the bolt, please see photo below. Grade 5 hex bolts shall be heat treated, at the option of the manufacturer and tempered to a minimum tempering temperature of 800 degrees Fahrenheit. A Grade 5 hex bolt has greater tensile strength than a Grade 2 hex bolt, and its yield to tensile ratio is the lowest of all heat treated steels. The length of a hex bolt is determined by measuring from under the head of the bolt to the base of the threads.
Description for: 3/8"-16 Hex Bolt
|Head Style:||Hex||Socket Size:||9/16|
|Proof Load, Lb.:||6,600||Tensile Strength, Lb.:||9,300|
SAE J429 Proof Load and Tensile Strength Requirements Above
Length is Measured from Under the Head to the Bottom of the Bolt