Heavy-Duty Galvanized Nuts for Industrial Machinery are robust fasteners designed to complement high-strength bolts in extreme load environments. Crafted from medium carbon steel (C content 0.25-0.45%), they undergo a hot-dip galvanized finish that deposits a zinc layer of 85-120μm, ensuring long-term corrosion protection in industrial settings.
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Product Description
Compliant with ASTM A563 standards, they offer consistent compatibility with structural bolts in heavy machinery, construction equipment, and power generation facilities.、、
Item | Hex Nut |
Material | Carbon steel |
Finish | zinc/black/plain/HDG |
Color | HDG |
Size | M6-M24 |
Application | Building,Machine parts,Furniture,Electric power fittings etc. |
High Load Capacity: The proof load of ASTM A563 Grade DH nuts reaches 175,000 psi (approximately 1206 MPa), with a tensile strength of 180,000-200,000 psi, suitable for high-stress mechanical connections in mining and construction equipment.
Corrosion Resistance: The galvanized coating forms a passive oxide layer that resists rust and chemical erosion, performing reliably in environments with 85%+ humidity or occasional chemical splashes.
Precision Threading: Compliant with ASME B18.2.2 standards, threads feature a 60° angle with 2-3 thread starts, ensuring uniform load distribution and preventing loosening under vibration.
Dimensional Versatility: Available in sizes from 1/4" to 4" (UNC/UNF threads) and metric equivalents (M6-M100), with hexagonal and square profiles to suit different wrench types.
Mining Equipment: Secures conveyor belt rollers, crusher jaws, and drill rig components, withstanding constant vibration and dust exposure.
Agricultural Machinery: Used in combine harvesters, tractor axles, and irrigation system pumps, resisting crop residues and outdoor moisture.
Material Handling: Applied in crane booms, forklift mast assemblies, and warehouse racking systems, maintaining clamping force under dynamic loads.
Q: What is the torque-tension relationship for these nuts?
A: For M20 size, a torque of 450-500 N·m typically achieves the recommended preload of 220 kN, but refer to specific bolt grade charts for precise values.
Q: Do they require lubrication during installation?
A: Dry installation is standard, but anti-seize compounds may be used in high-temperature applications (120-200°C) to prevent galling.
Q: How do they perform in low-temperature environments?
A: Suitable for temperatures as low as -30°C without significant loss of ductility, making them ideal for cold storage facilities and winter construction.
