Product Overview
Zinc plated Grade 5 hex bolts manufactured in China are a popular choice for structural, automotive, and machinery fastening. Our factory produces zinc plated fasteners with a blue-white zinc finish for enhanced corrosion resistance, compliant with ASME B18.2.1 and SAE J429 Grade 5 standards. These UNC hex head bolts are made from high-quality medium carbon steel, offering high strength and reliability. We supply both full thread and partial thread zinc-plated bolts in common sizes like 1/4-20×1/2, 5/16-18×5/8, and 3/8-16×5/8. As a professional hex bolts manufacturer in China, we export worldwide to Egypt, Saudi Arabia, UAE, Vietnam, Indonesia, and Kenya.
Technical Specifications
| Execution Standard | ASME B18.2.1 / SAE J429 |
| Material | Medium Carbon Steel (C 0.25-0.55%) |
| Surface Treatment | Blue-White Zinc Electroplating (5-8μm) |
| Strength Grade | Grade 5 (Tensile Strength ≥120ksi/827MPa) |
| Thread Specification | Unified Thread Standard (UNC/UNF) |
| Head Type | Hex Head (1/4″-1″ Specifications) |
| Corrosion Resistance | 72-hour Neutral Salt Spray Test |
| Mechanical Properties | Rockwell Hardness HRC25-34 |
| Available Sizes | 1/4″-20: 1/2″ to 6″, Full & Partial Thread 5/16″-18: 5/8″ to 7-1/2″, Full & Partial Thread 3/8″-16: 5/8″, 3/4″, 7/8″, Full Threadhread |
Application Scenarios
Conforming to ANSI/ASME B18.2.1 standards, the Grade 5 Zinc-Plated Hex Head Bolts offer reliable corrosion resistance and robust fastening, making them a staple in diverse industrial and mechanical applications. Their durability, backed by the Grade 5 strength rating, ensures secure performance in machinery assembly, automotive manufacturing, and construction projects. Whether in indoor workshops or outdoor installations, these Zinc-Plated Hex Bolts deliver long-lasting stability, adapting seamlessly to various environments while meeting strict industry specifications.:
Construction Projects
Secure structural steel frameworks and wood structures in building construction and infrastructure projects
Automotive Repair
Commonly used in vehicle assembly and maintenance for engine components, chassis, and body panels
Machinery Manufacturing
Fastening parts in industrial equipment, production machinery, and manufacturing assembly lines
Electrical Installations
Fixing components in electrical panels, control boxes, and power distribution assemblies
Furniture Production
Durable fastening for metal and wood furniture manufacturing, providing reliable joint connections
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
What makes your zinc plated hex bolts factory different from other suppliers?
As a real zinc plated hex bolts factory in China, we control every step from raw material sourcing to zinc plating and packaging. Our bolts comply with ASME B18.2.1 and SAE J429 Grade 5 standards, ensuring quality and consistency for global buyers.
What does Grade 5 mean?
Grade 5 indicates a medium-strength bolt with tensile strength of 120,000 psi (827 MPa). It’s suitable for most general applications requiring good tensile strength, making it the most commonly used grade for automotive and construction applications.
Can I choose between full thread and partial thread?
Yes, both full-thread and partial-thread options are available in various lengths to fit different assembly needs. Full-thread bolts provide maximum holding power, while partial-thread bolts offer better shear strength for specific applications.
Are these bolts compatible with US standard nuts?
Yes, they fully comply with US standards (ASME B18.2.1) and are compatible with standard Grade 5 nuts and washers. This ensures proper fit and optimal performance in all standard applications.
What’s the difference between UNC and UNF threads?
UNC (Unified National Coarse) threads are standard coarse threads for general applications, while UNF (Unified National Fine) threads provide finer pitch for applications requiring higher tensile strength and better vibration resistance.
Contact Us
Need more information about our Zinc-Plated Grade 5 US Standard Bolts or have special requirements? Our technical sales team is ready to serve customers across Southeast Asia with comprehensive fastener solutions.
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