S-92356A538 1/4"-20 x 5/8" ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation security with a square neck design that locks into materials during tightening, preventing spin-out and ensuring reliable fastening in wood and metal assemblies.
• Excellent corrosion resistance provided by 18-8 stainless steel construction, making it ideal for outdoor, marine, and high-moisture environments without compromising integrity.
• High tensile strength of 70,000 psi and Rockwell B55 hardness for dependable load-bearing capacity and resistance to deformation under stress in heavy-duty applications.
• Easy, quick installation with a coarse 1/4"-20 UNC thread and fully threaded shank, allowing for faster driving and secure engagement in various materials.
• Wide, rounded head profile distributes clamping force evenly, reducing surface damage and providing a finished appearance while enhancing grip.
• Precision threading with Class 2A fit ensures consistent, reliable performance and compatibility with standard nuts and components, minimizing assembly issues.
• Compliance with industry standards including ASME B18.5, RoHS 3, and REACH, guaranteeing safety, environmental responsibility, and interoperability in regulated sectors.

Professional Applications & Engineering Value

This carriage bolt is engineered to address common challenges in industrial and construction settings, such as vibration-induced loosening and corrosion-related failures. The 18-8 stainless steel material offers robust resistance to rust and chemicals, extending service life in harsh conditions like outdoor structures or marine equipment. Its square neck design embeds securely into pre-drilled holes, providing anti-rotation stability that prevents the bolt from turning during torque application—this is critical for maintaining joint integrity in wood-to-metal fastening, trailer assemblies, and machinery frames. The coarse UNC thread and fully threaded shank enable rapid installation and strong holding power, reducing labor time while ensuring dependable performance under heavy loads. Ideal for applications in construction, agriculture, and transportation, this bolt delivers long-term reliability and compliance with global standards.

Specification Summary & Compliance

This carriage bolt features precise dimensions including a 1/4"-20 UNC coarse thread with a Class 2A thread fit for consistent tolerance and easy assembly. It adheres to ASME B18.5 manufacturing specifications, ensuring dimensional accuracy and performance reliability. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally sensitive and regulated industrial uses.