Square Head Bolt

Bolt Standards:

• Square head bolts are not defined by a specific standard, but are a specialized type of bolt.

Material and Properties:

• Carbon steel

• Plain carbon steel (e.g. C10, C15, C22)

• Alloy steel (e.g. 34CrMo4, 40CrMnMoS8-6) for higher strength

• Stainless steel

• Austenitic (e.g. A2, A4) - Excellent corrosion resistance

• Martensitic (e.g. 1.4006, 1.4021) - Good corrosion resistance and strength

Bolt Design:

• Square-shaped head

• Threaded shank

Applications:

• Heavy-duty industrial and construction applications

• Machinery and equipment mounting

• Corrosive environments (stainless steel versions)

Coatings and Finishes:

• Plain (uncoated)

• Zinc plated (for mild corrosion resistance)

• Hot-dip galvanized (for better corrosion resistance)

• Stainless steel bolts may have a passivation or polishing finish

The key features of square head bolts are the square-shaped head, which provides a larger surface area for tightening and distributing the load compared to a typical hexagonal head. This design makes square head bolts well-suited for heavy-duty industrial and construction applications where high torque and load-bearing capacity are required.

The square head also helps prevent the bolt from rotating during installation or use, which is important in applications where the bolt needs to maintain a specific orientation, such as machinery and equipment mounting.

Square head bolts can be manufactured from carbon steel, alloy steel, or stainless steel, depending on the strength and corrosion resistance requirements of the application. Coatings like zinc plating, hot-dip galvanization, or stainless steel finishes can provide additional protection against corrosion.

The selection of the appropriate square head bolt will depend on factors such as the material, size, load-bearing requirements, and the specific application where the bolt will be used. Square head bolts are commonly found in heavy-duty industrial and construction settings, as well as in machinery and equipment mounting applications.