These custom bolt solutions include Special Head Bolts, Step Bolts, Long Shank Bolts, Shoulder Bolts, and other non-standard fasteners manufactured according to customer drawings or specifications. Different head designs, shank configurations, thread lengths, and materials are selected based on the requirements of each industry.
Structural Steel Connections
Large structural steel projects often require custom bolts that cannot be replaced by standard DIN or ISO fasteners. Different connection details, oversized holes, concealed installations, and limited wrench clearance frequently require special head configurations or extended shank lengths.
Our custom bolt solutions are widely used for beam-to-column connections, splice plates, truss systems, base plate assemblies, transmission towers, stadium structures, airport terminals, industrial buildings, and bridge construction.
According to the project requirements, bolts can be manufactured as Special Head Bolts, Long Shank Bolts, or Step Bolts with customized head dimensions, partial or full threads, precision shanks, oversized bearing surfaces, and forged head profiles.
Available manufacturing options include:
- Diameter: M6–M100
- Length: Up to 3000 mm
- Materials: Carbon Steel, Alloy Steel, SS304, SS316, Duplex 2205, Super Duplex 2507
- Strength Grades: 4.8, 8.8, 10.9, 12.9, ASTM A325, ASTM A490, ASTM F593
- Surface Finish: Hot Dip Galvanized, Geomet®, Zinc Flake, Dacromet®, Black Oxide, Zinc Nickel
Typical applications include structural steel frames, bridge girders, steel columns, crane beams, offshore modules, modular buildings, and heavy fabricated steel assemblies.
Wind Energy & Renewable Energy Equipment
Wind turbines and utility-scale solar projects require fastening systems capable of maintaining preload under dynamic loads while resisting long-term outdoor corrosion.
Custom Special Head Bolts, Long Shank Bolts, and Step Bolts are extensively used in tower flange connections, nacelle structures, generator frames, blade pitch systems, yaw mechanisms, solar mounting structures, tracking systems, and maintenance access ladders.
Depending on the installation requirements, bolts can be manufactured with extra-large flange heads, reduced heads, anti-rotation features, precision shanks, long grip lengths, or customized forged head designs compatible with OEM installation tools.
Typical materials include ASTM A490 Alloy Steel, A4-80 Stainless Steel, Duplex Stainless Steel 2205, Super Duplex 2507, and Titanium Alloy.
Corrosion protection options include Hot Dip Galvanizing, Geomet®, Zinc Flake, PTFE, Xylan®, and offshore marine-grade coating systems.
Mining & Heavy Construction Equipment
Mining and construction equipment operates under continuous vibration, shock loading, and abrasive environments where conventional fasteners may not provide sufficient durability or installation efficiency.
Our custom bolts are widely supplied for excavator buckets, hydraulic breakers, crushing equipment, drilling rigs, conveyor systems, wheel loaders, bulldozers, cement plants, asphalt plants, and quarry machinery.
Special Head Bolts simplify installation in confined spaces, Long Shank Bolts provide precise alignment for heavy assemblies, while Step Bolts are commonly used on access platforms, maintenance ladders, and service structures.
Available manufacturing capabilities include induction hardening, CNC-machined shanks, rolled threads, precision tolerance control, and customized forged heads.
Surface treatments include Zinc Flake, Geomet®, Dacromet®, Black Phosphate, PTFE, and Xylan® coatings for maximum corrosion and wear resistance.
Oil & Gas, Petrochemical & Offshore Engineering
Oil refineries, offshore platforms, pressure vessels, valves, pipelines, and drilling equipment require custom fastening solutions capable of operating under high pressure, elevated temperatures, and corrosive environments.
Custom Special Head Bolts and Long Shank Bolts are frequently used in flange connections, equipment foundations, compressor assemblies, heat exchangers, pumps, subsea equipment, and offshore structural modules.
Available materials include ASTM A193 B7, B7M, B8, B8M, Duplex Stainless Steel 2205, Super Duplex 2507, Inconel®, Monel®, Titanium Alloy, and other high-performance materials.
Optional coatings include PTFE, Xylan®, Electroless Nickel, Zinc Nickel, and marine-grade corrosion protection systems designed for extended offshore service life.
Transportation & Railway Infrastructure
Railway infrastructure and transportation equipment require highly reliable custom bolts for long service life under repeated dynamic loading.
Our custom bolt solutions are widely applied in rail fastening systems, bridge expansion joints, railway maintenance platforms, signal structures, overhead line equipment, heavy truck chassis, trailer assemblies, and commercial vehicle structures.
Products can be manufactured with special anti-rotation heads, precision shanks, long grip sections, or customized thread lengths according to OEM engineering drawings.
Common materials include Alloy Steel, Stainless Steel, Duplex Stainless Steel, and weather-resistant structural steels with Hot Dip Galvanized, Zinc Flake, or Geomet® surface protection