New Products

Dacromet Hex Bolts

Dacromet Hex Bolts are a new type of environmentally friendly, corrosion-resistant fastener made by coating high-strength hexagonal bolts with a Dacromet chromium-free zinc-aluminum coating. These Dacromet Hex Bolts are formed by dipping or spraying flake zinc powder, aluminum powder, and a special binder, followed by high-temperature sintering to create a uniform silver-gray coating. Compared to traditional hot-dip galvanizing or electro-galvanizing, Dacromet Hex Bolts offer superior resistance to hydrogen embrittlement, high temperatures, and salt spray. They are widely used in automotive engine peripheral components, wind turbine generators, rail transit braking systems, and marine engineering equipment. For high-strength bolt connections of grade 8.8 and above that require high corrosion resistance and are sensitive to hydrogen embrittlement, Dacromet Hex Bolts have become the preferred alternative to electro-galvanizing and some hot-dip galvanizing methods.

Product Description

Dacromet Hex Bolts are a new type of environmentally friendly, corrosion-resistant fastener made by coating high-strength hexagonal bolts with a Dacromet chromium-free zinc-aluminum coating. These Dacromet Hex Bolts are formed by dipping or spraying flake zinc powder, aluminum powder, and a special binder, followed by high-temperature sintering to create a uniform silver-gray coating. Compared to traditional hot-dip galvanizing or electro-galvanizing, Dacromet Hex Bolts offer superior resistance to hydrogen embrittlement, high temperatures, and salt spray. They are widely used in automotive engine peripheral components, wind turbine generators, rail transit braking systems, and marine engineering equipment. For high-strength bolt connections of grade 8.8 and above that require high corrosion resistance and are sensitive to hydrogen embrittlement, Dacromet Hex Bolts have become the preferred alternative to electro-galvanizing and some hot-dip galvanizing methods.

Product Feature

Excellent High-Temperature Resistance: The coating can withstand long-term use at 300℃ and short-term temperatures exceeding 500℃, making it suitable for high-temperature applications such as engine exhaust systems and turbochargers.

Uniform Coverage with No Dead Corners: Utilizing a dip-coating-centrifugal process, a uniform coating is achieved evenly in complex areas such as thread roots and the bottom of hexagonal heads, eliminating the tip-shielding effect of electroplating.

Self-Healing and Sealing Effect: Layers of sheet-like zinc and aluminum form a physical barrier; further enhancements in corrosion resistance and conductivity are available with the addition of sealants.