S-93604A633 1/4"-20 x 5" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with hot-dipped galvanized steel coating, ideal for outdoor and harsh industrial environments.
• Secure anti-rotation locking thanks to the square neck design, preventing bolt spin during installation and ensuring stable fastening.
• High tensile strength of 60,000 psi (Grade 2) provides reliable load-bearing capacity for demanding structural applications.
• Excellent thread engagement with fully threaded UNC coarse spacing and Class 2A fit, enabling quick assembly and vibration resistance.
• Wide rounded head profile distributes clamping force evenly, reducing surface damage and improving joint integrity.
• Compliance with ASTM A307 and ASME B18.5 standards ensures consistent quality, dimensional accuracy, and interchangeability.
• Environmental and safety adherence with RoHS 3 and REACH compliance, making it suitable for regulated industries.

Professional Applications & Engineering Value

This hot-dipped galvanized steel carriage bolt is engineered to address common industrial challenges such as corrosion, loosening under vibration, and installation efficiency. The square neck design locks securely into materials, eliminating the need for extra tools to prevent rotation during tightening—saving time and reducing labor costs. With a Rockwell B70 hardness and Grade 2 strength, it withstands heavy loads and mechanical stress in applications like construction framing, machinery assembly, and agricultural equipment. The fully threaded UNC coarse thread ensures rapid installation and reliable performance in wood, metal, and composite materials, while the zinc coating provides long-term durability against moisture and chemicals. Ideal for industrial carriage bolts used in structural supports, trailers, and outdoor fixtures, this fastener delivers consistent, compliant performance that minimizes maintenance and downtime.

Specification Summary & Compliance

This carriage bolt features precise Class 2A thread fit and UNC coarse threading (1/4"-20) for reliable engagement and interchangeability. It meets ASTM A307 and ASME B18.5 specifications, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable use in various industrial sectors.