S-98930A317 M8 x 25 mm ASME B18.5, ISO 8678 Carriage Bolts

Key Features & Benefits at a Glance

• Superior Anti-Rotation Performance: Square neck design securely locks into materials, preventing bolt spin during installation and under vibration.
• High Tensile Strength for Demanding Applications: Class 8.8 grade steel provides a robust 110,000 psi tensile strength, ensuring reliability in heavy-duty assemblies.
• Optimized for Quick Assembly: Coarse 1.25mm thread pitch and fully threaded shank enable faster driving and easier alignment in various materials.
• Enhanced Durability and Corrosion Resistance: Steel construction with Rockwell C22 hardness offers excellent wear resistance and long-term structural integrity.
• Wide-Ranging Compatibility: Rounded carriage head with wide profile distributes load effectively and is suitable for use with standard washers and pre-drilled holes.
• Precision Thread Fit for Secure Fastening: Class 6g thread tolerance ensures consistent, reliable engagement with nuts and tapped holes, reducing the risk of cross-threading.
• Compliance with Global Standards: Meets ASME B18.5 and ISO 8678 specifications, guaranteeing interchangeability and performance consistency in industrial settings.

Professional Applications & Engineering Value

This M8 carriage bolt is engineered to address critical challenges in heavy-duty fastening applications, such as structural steel connections, machinery assembly, and wood-to-metal fixtures. The square neck is a key feature that bites into the mounting surface, providing exceptional anti-rotation stability—this eliminates the need for additional locking mechanisms and reduces maintenance in high-vibration environments like agricultural equipment or conveyor systems. Made from Class 8.8 steel, it delivers a high tensile strength of 110,000 psi and Rockwell C22 hardness, ensuring it can withstand significant shear and tensile loads without failing. The fully threaded design with a coarse 1.25mm pitch allows for rapid installation and strong holding power in softer materials like wood or composite panels, making it a versatile and reliable choice for engineers and procurement specialists seeking durable, compliant fasteners.

Specification Summary & Compliance

This carriage bolt adheres to precise dimensional and performance standards, including Class 6g thread fit for consistent engagement and ASME B18.5 and ISO 8678 specifications for interchangeability. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in environmentally conscious industries. The bolt's construction meets the mechanical properties defined for Class 8.8 strength grade, confirming its reliability in critical applications.