Navigation Menu New

Access My Account, Order History, Lists and more here.

Square Head Bolts

42 products

Square head bolts are used in applications where visibility is limited but durable fastening is required. These bolts have large, flat sides and are easy to tighten with a wrench. Square heads are best used in tight or dark spaces where a machinist or fabricator must tighten the bolt blind. It is simple to fit a tool over the square shape even when there are no visual markers available.

Square head bolts are used in applications where visibility is limited but durable fastening is required. These bolts have large, flat sides and are easy to tighten with a wrench. Square heads are best used in tight or dark spaces where a machinist or fabricator must tighten the bolt blind. It is simple to fit a tool over the square shape even when there are no visual markers available.

System of Measurement

Steel Grade 5 Square Head Bolts

Steel Grade 5 Square Head Bolts

Grade 5 medium-strength square head bolts are used in applications where visibility is limited but durable fastening is required. These bolts have large, flat sides and are easy to tighten machinery and equipment with a wrench. Grade 5 steel hex head screws are marked with three radial lines. Square heads are best used in tight or dark spaces where a machinist or fabricator must tighten the bolt blind. It is simple to fit a tool over the square shape even when there are no visual markers available. These bolts come in a black oxide finish, which is corrosion resistant in dry environments, or are zinc-yellow coated for corrosion resistance in wet environments.

Black Oxide

1/2"-13 Coarse

Loading...

3/4"-10 Coarse

Loading...
Loading...

7/8"-9 Coarse

Loading...

1"-8 Coarse

Loading...

Zinc Yellow

3/8"-16 Coarse

Loading...
Loading...

1/2"-13 Coarse

Loading...
Loading...
Loading...

5/8"-11 Coarse

Loading...

3/4"-10 Coarse

Loading...

1"-8 Coarse

Loading...

Steel Grade 8 Square Head Bolts

Steel Grade 8 Square Head Bolts

Grade 8 square head bolts are used in applications where visibility is limited but durable fastening is required. Square heads are best used in tight or dark spaces where a machinist or fabricator must tighten the bolt blind. It is simple to fit a tool over the square shape even when there are no visual markers available. These bolts come in a black oxide finish, which is corrosion resistant in dry environments.

Black Oxide

1/2"-13 Coarse

Loading...
Loading...
Loading...
Loading...

5/8"-11 Coarse

Loading...
Loading...
Loading...
Loading...
Loading...
Loading...

3/4"-10 Coarse

Loading...
Loading...
Loading...
Loading...

7/8"-9 Coarse

Loading...
Loading...
Loading...
Loading...
Loading...
Loading...

1"-8 Coarse

Loading...
Loading...
Loading...

1-1/8"-7 Coarse

Loading...
Loading...
Loading...
Loading...
Loading...

1-1/4"-7 Coarse

Loading...
Note: Product availability is real-time basis and adjusted continuously. The product will be reserved for you when you complete your order.