DIN 912 8.8 zinc-nickel black Bolt with cylindrical head and internal hexagon

A cylindrical head bolt is a fastener consisting of a metal pin with incomplete metric thread and a high cylindrical head with an INBUS (hexagon) slot.

Area of application: DIN 912 bolts are used for connecting and fastening parts and structures in construction and mechanical engineering.

Material: high-strength structural alloy steel. The high strength class of 12.9 allows the bolts to be used in heavy-duty connections.

Coating: Black zinc-nickel. Zinc-nickel coating is an innovative anti-corrosion solution for fasteners, combining high protective properties, mechanical strength, and environmental safety.

The key advantages of zinc-nickel coating are:

• Excellent corrosion resistance - more than three times higher than that of conventional zinc;
• Low risk of hydrogen embrittlement;
• Compatibility with aluminum - does not form galvanic couples and does not cause corrosion in combination with aluminum parts;
• Increased heat resistance - retains its protective properties during temperature changes and during prolonged operation in high-temperature conditions;
• Mechanical strength - harder than pure zinc, has better resistance to scratches and wear;
• Environmental friendliness - less oxidation products are formed, resulting in lower zinc emissions into the environment throughout the product's life cycle.
• Aesthetics and inconspicuousness - the coating has a deep black color, which makes it inconspicuous.

Analogs: GOST 11738-84, ISO 4762, PN 82302, ISO 21269.