Product Overview
Our Hot-Dip Galvanized Hex Nuts are high-strength fasteners manufactured according to GB6170-86 standards, crafted from carbon steel and treated with hot-dip galvanizing process, achieving Grade 4.8 strength classification. The full-thread design provides uniform load distribution, while the hot-dip galvanized coating offers exceptional corrosion resistance, making these nuts ideal for long-term use in outdoor, humid, or corrosive environments across Southeast Asia’s diverse climate conditions.
Technical Specifications
| Execution Standard | GB6170-86(Chinese National Standard) |
| Material | Carbon Steel (C≤0.25%) |
| Surface Treatment | Hot-Dip Galvanizing (Average Film Thickness ≥50μm) |
| Strength Grade | Grade 4.8 (Tensile Strength ≥400MPa) |
| Corrosion Resistance | 1000-hour Neutral Salt Spray Test |
| Thread Specification | Metric Coarse Thread (M3-M24) |
| Hex Size | Standard Hexagon (GB/T3103.1) |
| Available Sizes | Metric Sizes: M8, M10, M12, M14, M16, M18, M20, M22 Imperial Equivalents: 5/16″, 3/8″, 1/2″, 9/16″, 5/8″, 3/4″, 3/4″, 7/8″ |
Application Scenarios
These Hot-Dip Galvanized Nuts are widely used across Southeast Asia in demanding applications requiring superior corrosion resistance and reliable fastening:
Steel Structure Fastening
Essential for bridges, buildings, and towers exposed to weather conditions and requiring long-term durability
Outdoor Equipment Assembly
Ideal for mounting solar systems, guardrails, and fences in tropical and coastal environments
Heavy Machinery
Used in equipment that operates under moisture or harsh industrial conditions requiring reliable fastening
Construction Projects
Ensures strong locking in concrete frameworks and scaffolding systems for building construction
Utility and Power Systems
Common in pole line hardware and electrical installation requiring weather-resistant fasteners
Frequently Asked Questions
What is the difference between galvanized and hot-dip galvanized coatings?
Galvanized coatings generally refer to zinc layers applied by electroplating or spraying, which are thinner and less durable. Hot-dip galvanizing involves immersing the steel in molten zinc, forming a thicker, more robust coating that offers superior rust protection — ideal for our nuts used in demanding outdoor applications.
Are these nuts suitable for high-strength bolts?
Grade 4.8 nuts are compatible with standard applications and medium-strength bolts. For high-tensile bolts (Grade 8.8 or above), we recommend using matching nut grades to ensure optimal performance and safety.
What hole size is recommended for bolts to be hot-dip galvanized properly?
For hot-dip galvanizing, bolt holes and threads should allow zinc coating thickness without interference. Generally, holes are designed slightly larger than the bolt size to accommodate the zinc layer (about 50μm). Our M8 to M22 nuts follow this guideline to ensure easy assembly and long-term performance.
Do you provide matching bolts and washers?
Yes, we offer complete fastener sets including bolts, washers, and nuts in hot-dip galvanized finish. This ensures consistent quality and appearance across your entire fastening system.
What is the expected lifespan in outdoor applications?
With proper installation, hot-dip galvanized nuts can provide 15-25 years of service life in typical outdoor environments. In severe marine conditions, regular inspection and maintenance may extend their useful life significantly.
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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Need more information about our Hot-Dip Galvanized Nuts or have special requirements? Our technical sales team is ready to serve customers across Southeast Asia with customized solutions.
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