ASTM A307 Bolts | McMaster-Carr

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About Hex Head Screws and Bolts

Low-Strength Steel Hex Head Screws

About half as strong as medium-strength steel screws, these screws can be used for light duty fastening applications, such as securing access panels.

Low-Strength Steel Square-Neck Carriage Bolts

About half the strength of medium-strength bolts, these Grade 2 bolts are for light duty fastening. Carriage bolts have a smooth, rounded head for a finished look. The square neck keeps these bolts from turning when tightening a nut.

Low-Strength Steel Knurled-Neck Carriage Bolts

About half the strength of medium-strength bolts, these bolts are for light duty fastening. Carriage bolts have a smooth, rounded head for a finished look. The knurled neck grips the inside of the hole to keep these bolts from turning when tightening a nut.

Steel Hex Head Screws for Wood

These steel screws have corrosion-resistant finishes.

Low-Strength Grade A Steel Square Head Screws

About half the strength of medium-strength screws, these screws are for light duty fastening applications, such as securing access panels. Large flat sides make these screws easy to grip with a wrench and keep them from rotating in square holes.

Machine Screw-Style Hangers

You can use these versatile hangers in a threaded hole (as you would a screw), or secure them with a nut (as you would a bolt).