Countersunk bolt grade 8.8 is a high tensile fastener designed for applications requiring strong clamping force combined with a neat, flush finish. These grade 8.8 countersunk bolts are widely used in mechanical engineering, steel structures, construction, and heavy machinery assembly.
๐ฉ What is a Grade 8.8 Countersunk Bolt?
A countersunk bolt grade 8.8 features:
- Head Type: Flat countersunk head for flush installation
- Drive Type: Hex socket or cross drive for secure tightening
- Thread Types: Metric threads (M4, M5, M6, M8, M10, M12, M16) as standard
- Material: Medium carbon steel, heat-treated and tempered to achieve class 8.8 mechanical properties
- Standards: DIN 7991 / ISO 10642
These high tensile countersunk bolts provide superior clamping force while ensuring surfaces remain smooth and hazard-free.
โ Key Specifications
- Thread Sizes: M4 โ M16 standard, other sizes customizable
- Material Grade: Carbon steel class 8.8 with high tensile strength
- Tensile Strength: Minimum 800 MPa
- Surface Treatments: Plain, zinc plated, black oxide, hot-dip galvanized
- Length: From 10mm to 200mm, customizable based on design requirements
โ๏ธ Applications of Countersunk Bolt Grade 8.8
โ Structural steel connections โ high strength with flush surface for safety
โ Heavy machinery assembly โ ensures tight joints with no protruding bolt heads
โ Construction projects โ stair treads, platforms, and flooring installations
โ Automotive and trailer components โ robust fastening with aesthetic flush finish
โ Industrial equipment installation โ where vibration resistance and tensile strength are critical
๐ง Advantages of Choosing Our Grade 8.8 Countersunk Bolts
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High tensile strength (800 MPa minimum) for demanding mechanical loads
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Flush head design improves aesthetics and safety
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Hex socket or cross drive options for versatile assembly
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Wide size range with customizable dimensions
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OEM & ODM manufacturing for specific project requirements
๐ฆ Packaging & Supply Details
- MOQ: 1,000 pcs per size
- Packaging: Bulk cartons with pallets / small boxes with labels / OEM branded packaging
- Lead Time: 7โ15 working days depending on material and customization
- Customization: Diameter, length, head type, drive type, coating, branding
๐ก Why Choose Our High Tensile Countersunk Bolts?
As a professional countersunk bolt grade 8.8 manufacturer and supplier, we provide:
โ Strict quality control from raw material sourcing to heat treatment and final inspection
โ Competitive factory pricing with stable long-term supply
โ OEM & ODM services for construction hardware brands, machinery manufacturers, automotive suppliers, and fastener distributors
โ Export experience to Europe, North America, Southeast Asia, and the Middle East
๐ Learn More
Looking for reliable grade 8.8 countersunk bolts for strong, flush mounting in your structural and engineering projects?
๐ Visit our product page here to view detailed specifications and place your order directly with the factory.
๐ฉ Contact Us Today
Get in touch for technical drawings, CAD support, free consultation, and factory-direct quotations to support your construction, structural steel, and heavy machinery projects.