S-98930A144 M8 x 90 mm ISO 8678 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance due to the integrated square neck design, preventing loosening under vibration and dynamic loads
• Exceptional corrosion resistance provided by the zinc yellow-chromate plating, ensuring longevity in harsh or outdoor environments
• High tensile strength of 110,000 psi and Class 8.8 rating for reliable performance in heavy-duty and structural applications
• Optimized thread engagement with M8 coarse threading (1.25mm pitch) and Class 6g fit for faster assembly and secure fastening
• Enhanced durability from Rockwell C22 hardness, resisting wear and deformation under high stress
• Wide, rounded carriage head distributes clamping force effectively and provides a finished appearance while reducing surface damage
• Compliance with ISO 8678 ensures consistent quality, dimensional accuracy, and international interoperability

Professional Applications & Engineering Value

This M8 carriage bolt is engineered to address critical challenges in industrial assembly, where vibration resistance, corrosion protection, and structural integrity are paramount. The zinc yellow-chromate plated steel construction offers a robust barrier against rust and chemical exposure, making it ideal for outdoor machinery, agricultural equipment, and construction frameworks. The square neck securely locks into materials, eliminating spin-out during installation and maintaining clamp load in high-vibration environments like automotive chassis or conveyor systems. With its partially threaded design and coarse metric thread, it ensures rapid installation and reliable holding power in wood, metal, and composite assemblies, reducing maintenance cycles and improving operational safety.

Specification Summary & Compliance

This carriage bolt conforms to ISO 8678 specifications, ensuring precise dimensional control and performance reliability. Threading adheres to Metric M8 x 1.25mm with Class 6g tolerance for consistent fit. The Class 8.8 strength grade and 110,000 psi tensile strength validate its use in demanding applications. Manufacturing complies with relevant industry standards for material and plating quality, supporting RoHS and REACH environmental directives where applicable.