Product Overview
Our Grade 5 Zinc-Plated US Standard Hex Nuts are high-strength fasteners manufactured strictly according to ASME B18.2.2 standards, specifically designed for heavy-duty applications requiring reliable connections. These medium carbon steel nuts undergo professional zinc plating treatment, providing excellent corrosion resistance while maintaining high hardness grade of HRC25-34, ensuring long-term stability in various harsh environments.
Technical Specifications
| Material Grade | SAE1035/1040 or SAE4037 |
| Tensile Strength | ≥120,000 psi (827 MPa) |
| Yield Strength | ≥92,000 psi (634 MPa) |
| Hardness Range | HRC25-34 |
| Surface Treatment Thickness | Zinc Plating: 5-8μm; Hot-Dip Galvanizing: 45-55μm |
| Salt Spray Test | Zinc Plating: 72h+; Hot-Dip Galvanizing: 500h+ |
| Available Sizes | 1/4″, 5/16″, 3/8″, 7/16″, 1/2″, 5/8″, 3/4″, 7/8″, 1″ |
Application Scenarios
These Grade 5 Zinc-Plated Hex Nuts are widely used in industries that require secure, vibration-resistant fastening with moderate to high tensile strength:
Construction & Steel Structures
Used with Grade 5 bolts in steel frames, bridges, metal panels, and scaffolding
Automotive Industry
Ideal for vehicle frames, suspension systems, and engine components
Machinery Manufacturing
Applied in mechanical equipment and industrial machinery assembly
Telecommunications & Electrical
Suitable for securing base plates, towers, and support systems
Solar Mounting Systems
Used with galvanized bolts to fasten brackets and modules in solar energy systems
Frequently Asked Questions
How do your Grade 5 nuts differ from ASTM A563 standard?
Our products comply with ASME B18.2.2 standard, equivalent to ASTM A563 Grade DH nuts in performance, but with different chemical composition and heat treatment processes.
Which is better for outdoor use – hot-dip galvanizing or zinc plating?
Hot-dip galvanizing has thicker coating (~50μm) with superior corrosion resistance, ideal for long-term outdoor exposure; zinc plating (5-8μm) is suitable for indoor or short-term protection needs.
Can you provide Dacromet coated nuts?
Yes, we offer Dacromet coating treatment. This chrome-free coating provides excellent corrosion resistance, particularly suitable for automotive and high-corrosion environment applications.
What is the minimum order quantity?
Standard sizes have MOQ of 1,000 pieces, special sizes are negotiable. We also provide samples for testing and verification.
Our Manufacturing Facility and Products
Direct Supply from Chinese Factory
Welcome to Handan Quanfan Metal Products Co., Ltd., a leading China manufacturer specializing in fasteners including self drilling screws, drywall screws, stainless steel bolts, self tapping screws, and grade 5 nuts.
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