Stainless Steel Hex Bolts (SS304 / SS316) | A4-80 Heavy Duty Hexagon Head Fasteners

Product Highlights

• Hex Head Design: Optimized for high-torque installation, enabling firm fastening and effortless assembly with standard industrial wrenches.
• Premium Rust Resistance: Available in genuine SS304 and SS316 grades, specifically engineered to combat high humidity and coastal rust in Southeast Asian environments.
• Customizable Dimensions: Tailored to specific customer requirements, supporting multiple length options (20–85mm+) and thread specifications for flexible project matching.
• Bright Passivated Finish: Advanced surface polishing and passivation ensure smooth thread alignment, preventing seizing and stripping during installation.
• Global Standard Compliance: Manufactured in strict accordance with international standards (DIN933 full thread / DIN931 half thread), ensuring seamless compatibility and reducing procurement costs.

Product Specifications

📦 Packing & Logistics Data

1. Standard Industrial Packaging: 25 kg per reinforced corrugated carton, 36–48 cartons per solid fumigation-free wooden pallet (approx. 1 ton per pallet).
2. Inner Protection: Moisture-proof plastic bags inside each carton to prevent surface friction and humidity scaling during long-distance tropical sea freight.
3. Custom Packaging Options: Supports small box packaging (e.g., 100 or 500 pcs/box) with your private brand labels and barcoding for regional distributor retail.
4. Container Loading Capacity: Approximately 20–25 tons per 20ft container (20GP), depending on destination port weight restrictions in Southeast Asia.

Manufacturing Standards & Dimension Correspondence

We strictly manufacture according to international fasteners frameworks. You can order based on your local blueprint requirements:

• Full-Thread Hex Bolts: Complies with DIN 933 / ISO 4017 / ASME B18.2.1
• Half-Thread Hex Bolts: Complies with DIN 931 / ISO 4014
• Thread Tolerance: 6g standard precision threads ensuring smooth engagement with standard hex nuts without jamming

Application Scenarios

Widely applied in municipal construction engineering, marine hardware, food processing equipment, chemical pipelines, and automated machinery manufacturing. It provides high-tensile, stable fastening for outdoor steel structures, coastal solar panel bracket installations, and industrial liquid transmission systems. Specially suited for heavy-duty projects in tropical, high-salinity, and highly humid regions, ensuring prolonged asset life and structural safety.

Why Choose Us?

1. Direct Source Factory Quality: Located in Handan, China’s fastener hub, we implement strict automated testing (tensile, hardness, and chemical spectrometry) to ensure 100% industrial-grade compliance.
2. Flexible B2B Customization: Quick response to customized logos, head stamps, non-standard thread lengths, and tailored packaging, shortening your project procurement cycle.
3. Non-Magnetic & True Stainless Properties: Every batch undergoes strict material verification to guarantee high nickel/chromium content for reliable anti-acid and anti-corrosion protection.
4. Optimized Southeast Asia Logistics: Strong ties with major ports (Tianjin/Qingdao) allow us to provide cost-effective and timely shipping to Vietnam, Thailand, Malaysia, Indonesia, the Philippines, and Singapore.

Frequently Asked Questions

Q1: Do you support small-batch custom purchases?

Yes. While our standard custom MOQ is 1,000 pieces per size, we offer flexible purchasing options and support trial batch orders for common specifications that we hold in stock.

Q2: How do I choose between Stainless Steel 304 and 316 bolts?

SS304 is perfect for general outdoor use, machinery, and daily rain exposure. If your project is located in a high-salinity coastal zone, chemical plant, or marine environment, we strongly recommend SS316 (A4-80) due to its superior resistance to pitting corrosion.

Q3: Do your bolts come with Material Test Certificates (MTC)?

Yes. We run full product testing (Tensile, Hardness, and Spectrometer analysis). We can provide certified EN 10204 3.1 Material Test Certificates alongside your shipment.

Q4: How do you prevent thread galling (locking/seizing) during the installation of stainless steel bolts?

Thread galling is a common issue with stainless steel fasteners when friction generates heat. At Hotop Fasteners, our bolts undergo an advanced precise passivation and automated thread-rolling process that significantly reduces surface roughness.

We highly recommend using a low-speed torque wrench during assembly or applying a thread lubricant to completely eliminate locking issues in high-speed installations.

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We support full product customization, sample testing, and flexible batch orders with strict quality assurance and on-time delivery.

Contact us now to get a free tailored quote and professional technical support!