Hex Bolts A307 and A307B

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Hex Bolts A307 & A307B Supplier

As a leading Hex Bolts A307 distributor, Bayou City Bolt keeps ASTM A307 and A307B hex bolts in stock. We also stock the ASTM A563 Hex Nuts (Heavy and Finish) to go with these bolts.

ASTM A307 Sizes & Specifications

The ASTM A307 specification covers carbon steel bolts, rods/studs, and anchor bolts ranging from 1/4″ through 4″ diameter. This is your everyday, run-of-the-mill bolt specification, often manufactured using an A36 round bar. They have low hardness and tensile requirements and are generally used in low-pressure, standard, or average-temperature applications. There are three grades: A, B, and C*, which denote tensile strength, configuration, and application.

You will often hear about A307 and Grade 2 bolts as being equivalent. While slight differences exist, they are referred to as “low carbon” fasteners. A307 is an ASTM (industrial) spec, while Grade 2 is an SAE J429 Grade 2 (automotive) spec.

We carry a full line finished in 

  • Plain
  • Zinc
  • Hot-dipped galvanized. 

A307 Grades


ASTM A307 Grade A

Headed bolts, threaded rods and bent bolts intended for general


ASTM A307 Grade B

Heavy hex bolts and studs intended for flanged joints in piping systems


ASTM A307 Grade C

Non-headed anchor bolts, either bent or straight, intended for structural anchoring purposes.   It should be noted that as of August 2007, grade C has been replaced by specification F1554 grade 36.

View more information visit our technical pages

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