GB55 Hexagonal Thick Nut is a rugged, high-performance fastener designed to address the most demanding challenges in automotive engineering, offering superior strength and stability for critical vehicle systems. Its reinforced "thick" design provides an extended thread engagement length, significantly enhancing tensile strength and resistance to loosening under extreme vibration—a vital feature for high-stress applications such as wheel hub assemblies, driveline components, and engine mounts. Crafted from high-grade carbon or alloy steel, this nut delivers exceptional load-bearing capacity, making it ideal for heavy-duty use in truck chassis, off-road vehicle suspensions, and hydraulic brake systems. The hexagonal head ensures compatibility with standard tools, streamlining assembly and maintenance while maintaining precise torque control. Treated with corrosion-resistant coatings like zinc plating or Dacromet, it withstands harsh automotive environments, including exposure to road salts, moisture, and temperature fluctuations. Engineers trust GB55 for applications requiring fail-safe clamping force, such as axle shafts, transmission housings, and towing attachments, where even micrometer-level slippage could compromise safety. By adhering to China’s GB standards, it guarantees seamless integration with domestic and global automotive designs, reducing compliance complexities. For manufacturers prioritizing durability without sacrificing ease of use, the GB55 Hexagonal Thick Nut stands as a cornerstone of automotive reliability—bridging robust mechanical performance with cost-effective scalability in modern vehicle production. Key Advantages for Your Applications: Unrivaled Strength & Stability: The reinforced "thick" design provides extended thread engagement, dramatically increasing tensile strength and resistance to loosening, even under extreme and prolonged vibration. Exceptional Load-Bearing Capacity: Manufactured from premium-grade carbon or alloy steel, ensuring reliable performance in heavy-duty applications. Superior Vibration Resistance: Specifically engineered to maintain clamping force in high-vibration environments, crucial for safety-critical components. Enhanced Corrosion Protection: Treated with high-performance corrosion-resistant coatings like zinc plating or Dacromet, safeguarding against rust, road salts, moisture, and temperature extremes. Standard Tool Compatibility: The hexagonal head design allows for easy and efficient installation and removal using standard automotive tools, streamlining assembly and maintenance. Precise Torque Control: Facilitates accurate torque application during assembly, ensuring optimal clamping force and joint integrity. Guaranteed Compatibility: Adherence to China's GB standards ensures seamless integration with both domestic and global automotive designs, simplifying compliance. Enhanced Durability: Built to withstand the rigors of demanding automotive applications, contributing to the overall longevity and reliability of the vehicle. Fail-Safe Clamping Force: Provides the secure clamping force required for critical joints where even minimal slippage can have significant safety implications. Cost-Effective Scalability: Delivers robust mechanical performance without sacrificing the potential for cost-effective implementation in large-scale vehicle production. Ideal for: Wheel Hub Assemblies: Providing the critical, long-lasting clamping force required for wheel security and stability under extreme loads and vibrations. Driveline Components: Ensuring the integrity and secure connection of shafts, yokes, and other vital parts of the vehicle's power transmission system. Engine Mounts: Withstanding significant engine vibrations and loads, maintaining engine stability and reducing noise and harshness. Truck Chassis: Delivering the robust fastening required for the heavy loads and demanding conditions experienced by commercial vehicles. Off-Road Vehicle Suspensions: Providing the strength and resistance to loosening necessary for the extreme stresses encountered in off-road driving. Hydraulic Brake Systems: Ensuring the secure and leak-proof connection of critical brake lines and components under high pressure. Axle Shafts: Providing the fail-safe clamping force needed for secure wheel and brake rotor attachment. Transmission Housings: Maintaining the structural integrity and preventing leaks in the vehicle's transmission system. Towing Attachments: Ensuring a secure and reliable connection for towing, a critical safety feature for vehicles equipped with towing capabilities. Heavy Equipment: Extending its application beyond standard automobiles to robust fastening needs in construction, agricultural, and other heavy-duty machinery. Product NameStandardMaterialDiameterThickness/HeightHexagonal Thick NutGB/T 6175-201645 Carbon Steel, ZincM10 (10 mm)8 mmHexagonal Thick NutGB/T 6175-201645 Carbon Steel, ZincM12 (12 mm)10 mmHexagonal Thick NutGB/T 6175-201645 Carbon Steel, ZincM16 (16 mm)13 mmHexagonal Thick NutGB/T 6175-201645 Carbon Steel, ZincM20 (20 mm)16 mmHexagonal Thick NutGB/T 6175-201645 Carbon Steel, ZincM24 (24 mm)19 mmHexagonal Thick NutGB/T 6175-201645 Carbon Steel, ZincM30 (30 mm)24 mmHexagonal Thick NutASME B18.2.2ASTM A563 Grade A, Zinc1/2" (12.7 mm)0.45" (11.43 mm)Hexagonal Thick NutASME B18.2.2ASTM A563 Grade A, Zinc3/4" (19.05 mm)0.65" (16.51 mm)Hexagonal Thick NutASME B18.2.2ASTM A563 Grade A, Zinc1" (25.4 mm)0.8" (20.32 mm)Hexagonal Thick NutASME B18.2.2ASTM A563 Grade A, Zinc1-1/2" (38.1 mm)1.2" (30.48 mm)Hexagonal Thick NutDIN 6914C45E Steel, Black OxideM12 (12 mm)10 mmHexagonal Thick NutDIN 6914C45E Steel, Black OxideM16 (16 mm)13 mmHexagonal Thick NutDIN 6914C45E Steel, Black OxideM20 (20 mm)16 mmHexagonal Thick NutDIN 6914C45E Steel, Black OxideM24 (24 mm)19 mmHexagonal Thick NutDIN 6914C45E Steel, Black OxideM30 (30 mm)24 mmHexagonal Thick NutISO 4034AISI 304 Stainless SteelM8 (8 mm)6.5 mmHexagonal Thick NutISO 4034AISI 304 Stainless SteelM10 (10 mm)8 mmHexagonal Thick NutISO 4034AISI 304 Stainless SteelM12 (12 mm)10 mmHexagonal Thick NutISO 4034AISI 304 Stainless SteelM16 (16 mm)13 mmHexagonal Thick NutJIS B1186S45C Carbon Steel, Zinc10 mm8 mmHexagonal Thick NutJIS B1186S45C Carbon Steel, Zinc16 mm13 mmHexagonal Thick NutJIS B1186S45C Carbon Steel, Zinc20 mm16 mmHexagonal Thick NutJIS B1186S45C Carbon Steel, Zinc24 mm19 mmHexagonal Thick NutANSI B18.2.2SAE J995 Grade 5, Cadmium3/8" (9.53 mm)0.35" (8.89 mm)Hexagonal Thick NutANSI B18.2.2SAE J995 Grade 5, Cadmium7/16" (11.11 mm)0.4" (10.16 mm)Hexagonal Thick NutANSI B18.2.2SAE J995 Grade 5, Cadmium1" (25.4 mm)0.8" (20.32 mm)