A4 Bolt

The A4 bolt with hex, square or countersunk head is widely used in the construction of river and sea vessels.

Structurally, the A4 bolt is a cylindrical rod, the lower part of which has a fine or coarse metric thread. The upper section is smooth and transitions into the head via a radius. The head and the cylindrical part may have technological holes.

Molybdenum in the alloy composition increases the bolts’ resistance to aggressive media. Fasteners made of A4 steel are not affected by acids, chlorine-containing compounds, or salt water.

A4 bolts are used in the manufacture of:

• equipment for the chemical and oil and gas industry;
• boiler and coke-chemical plants;
• instruments and automation equipment for various industries, including food and medical;
• hand, mechanical and power tools for use in demanding conditions.

The A4 bolt is characterized by ductility, good weldability, high manufacturability, reliable fastening, and corrosion resistance.