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Help CenterGB21 Small Hexagon Head Bolt ANSI DIN ISO Fasteners, Professional Supplier
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GB21 small hexagon head bolts are standard fasteners used in automobile manufacturing, mechanical equipment, building structures and other fields. The bolts comply with the GB21 national standard and have excellent mechanical properties and reliable connection strength. Its small hexagon head design can provide higher torque transmission in a limited space while optimizing installation efficiency.
GB21 small hexagon head bolts are made of high-strength alloy steel and undergo a heat treatment process to improve wear resistance and tensile strength to meet the high requirements of the automotive industry for fasteners. The surface treatment of the bolts can be galvanized, electrophoresed or other anti-corrosion processes as required to enhance rust resistance and improve durability. In the automotive field, GB21 small hexagon head bolts are often used in key parts such as engine components, chassis connections, suspension systems, etc., providing vehicles with safe and reliable fastening solutions
Key Advantages for Your Applications:
Standardized Reliability: Complies with the GB21 national standard, ensuring consistent performance.
High Mechanical Strength: Manufactured from high-strength alloy steel and heat-treated for exceptional durability.
Efficient Torque Transmission: Small hexagon head allows for high torque in limited spaces.
Optimized Installation Efficiency: Streamlined head design facilitates faster assembly.
Enhanced Wear Resistance: Heat treatment improves the bolt's ability to withstand friction and wear.
Customizable Corrosion Protection: Galvanizing, electrophoresis, and other options available.
Secure and Reliable Connections: Ensures the integrity and safety of critical assemblies.
Ideal for:
Engine Components: Securing cylinder heads, manifolds, brackets, and other critical engine parts.
Chassis Connections: Joining frame members, crossmembers, and other structural elements.
Suspension Systems: Fastening control arms, struts, linkages, and other suspension components.
Transmission Assemblies: Securing internal components and housings.
Braking Systems: Attaching calipers, rotors, and other braking components.
Automotive Interior and Exterior: Securing panels, trim, and other non-structural elements where space is a concern.
Mechanical Equipment: General fastening in machinery where space efficiency is required.
Building Structures: Certain light-duty structural applications where a smaller head profile is beneficial.
| Product Name | Standard | Material | Diameter (Thread Size) | Length |
| Hexagon Head Bolt | GB/T 5782-2016 | Carbon Steel, Grade 8.8 | M5 | 16 mm |
| Hexagon Head Bolt | GB/T 5782-2016 | Carbon Steel, Galvanized | M6 | 20 mm |
| Hexagon Head Bolt | GB/T 5782-2016 | Stainless Steel A2-70 | M8 | 25 mm |
| Hexagon Head Bolt | GB/T 5782-2016 | Alloy Steel, Grade 10.9 | M10 | 30-100 mm |
| Hexagon Head Bolt | GB/T 5782-2016 | Carbon Steel, Black Oxide | M12 | 40-120 mm |
| Hexagon Head Bolt | ASME B18.2.1 | ASTM A307, Grade B | 1/4" | 1" (25.4 mm) |
| Hexagon Head Bolt | ASME B18.2.1 | ASTM A325, Type 1 | 5/16" | 1.5" (38 mm) |
| Hexagon Head Bolt | ASME B18.2.1 | ASTM A193 B7 | 3/8" | 2" (50.8 mm) |
| Hexagon Head Bolt | ASME B18.2.1 | Stainless Steel 316 | 1/2" | 3" (76.2 mm) |
| Hexagon Head Bolt | DIN 931 | C45 Steel, Galvanized | M6 | 20-200 mm |
| Hexagon Head Bolt | DIN 933 | 8.8 Steel, Plain | M8 | 25-200 mm |
| Hexagon Head Bolt | ISO 4014 | Steel, Grade 8.8 | M10 | 30-300 mm |
| Hexagon Head Bolt | ISO 4017 | Stainless Steel A4-80 | M12 | 40-300 mm |
| Hexagon Head Bolt | JIS B 1180 | SCM435 Alloy Steel | M6 | 20-150 mm |
| Hexagon Head Bolt | JIS B 1180 | SUS304 Stainless Steel | M8 | 25-150 mm |
| Hexagon Head Bolt | ANSI B18.2.3.6M | ASTM A490, Galvanized | M16 | 50-300 mm |
| Hexagon Head Bolt | BS 3692 | EN 14399-4 Grade 10.9 | M20 | 60-300 mm |
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