Hex Bolt
Hex bolts are externally threaded fasteners with a six-sided (hexagonal) head, designed for use with a wrench or socket. They are widely used in structural and industrial applications where strong, secure fastening is required. Hex bolts are suitable for use with nuts or in tapped holes and are commonly applied in flanges, valves, machinery, and pressure equipment etc..
Applicable Standards
Dimensional Standards:
- ASTM A307
- ASME B18.2.1 (Hex Bolts & Screws)
- DIN 931 / DIN 933
- ISO 4014 / ISO 4017
- ASME B18.2.3.7M
- ISO 7412 / UNI 5712 / BS 1769
- DIN EN 14399-4
- ASME B18.2.3.5M: Metric hex bolts (US metric standard)
- ASME B18.2.3.6M: Metric Heavy Hex Structural Bolts
- DIN 6914: High-strength structural bolts with heavy hex head
Material Standards
- ASTM A193 (B7, B7M, B8, B8M, etc.)
- ASTM A320 (L7, L7M, etc.)
- ASTM A325 / A490 (Structural Bolting)
- SAE
Material Grades (Commonly Used):
High Tensile, Stainless Steel, Alloy Steel, Inconel, Incoloy, Hastelloy, Monel, Silicon Bronze, Phosphor Bronze, Aluminium Bronze, Nickel, Brass, Copper, Copper Nickel,Duplex, Super Duplex, Titanium Alloys, CB20, Nitronic, Nimonic, ASME, ASTM etc…
Typical Specifications
- Size Range: M3 to M160 / ¼” to 6” (or as required)
- Length As per standard or custom
- Thread Type: UNC / UNF / Metric (Coarse & Fine)
Finish/Coating
- PTFE Coated (Blue
- Yellow, Red, Green & Black)
- Hot Dip Galvanized
- Yellow Zinc Plated
- Blue Zinc Plated
- Molykote
- Aluminium Zinc Flake Coated
- Black Phosphate
- inc Plated
- Nickel Plated
Applications
Hex bolts are widely used in:
- Oil & Gas Industry
- Petrochemical Plants
- Power Generation
- Structural and Heavy Engineering
- Pressure Vessels, Valves, and Flanges