Product Overview
Grade 5 Zinc-Plated Nut – High-quality US standard fasteners from China suppliers. Crafted with medium carbon steel (SAE1035/1040) or alloy steel (SAE4037), these nuts offer HRC25-34 strength. Available in sizes 1/4″ to 1″, ideal for machinery, construction, and automotive applications requiring reliable clamping. Surface treatments include electroplating, hot-dip galvanizing, and more for corrosion resistance. Certified to ASME B18.2.2, ensuring precision. MOQ 50KG, EXW $0.01/pc (varies by specs). Trusted Chinese supplier with flexible packing and shipping from Qingdao/Ningbo/Shanghai ports.
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
Product Quality Certificate
Quality Certification Standards
Product quality is our priority, validated by Hebei Provincial Fastener Product Quality Supervision and Inspection Center. This authoritative provincial institution has rigorously tested our screws, nuts and bolts for material, hardness, strength, precision and corrosion resistance—all meeting or exceeding industry standards. This certification guarantees reliable performance for your projects.
Product Packaging Specifications
Comprehensive Packaging Solutions
- Inner Packaging: 25kg per woven bag or small box, PE bag lining
- Outer Packaging: 900kg wooden pallets or fumigated plywood cases
- Custom Packaging: Logo boxes, barcode stickers available on request
Manufacturing Facility Overview
Advanced Manufacturing Facility
Our 5,000㎡ workshop features clear zones for raw materials, processing, testing and finished goods. Equipped with over 50 advanced CNC machines and cold headers, we achieve ±0.01mm precision from wire to finished fasteners. 20+ skilled staff monitor production, while a dedicated lab with tensile testers and spectrometers ensures strict quality checks—rejecting all substandard products.
Customer Service Policy
Return & Exchange Policy
We stand behind our high-quality fasteners. For defective products, returns are accepted within 7 days of receipt (unused, in original packaging, with defect evidence); we refund product cost (shipping non-refundable). Exchanges for wrong specs or minor defects (unused) are allowed within 7 days, with customer covering shipping. Not accepted: customer-caused errors, used/damaged products, requests after 7 days.
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.
Contact Us
Need more information about our Grade 5 Zinc-Plated Hex Nuts or have special requirements? Our technical sales team is ready to serve you.
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