S-90185A415 1/4"-20 x 4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance thanks to the integrated square neck design that securely locks into materials, preventing bolt spin during installation and under vibration.
• Exceptional strength for demanding applications with a Grade 5 classification and 120,000 psi tensile strength, ensuring reliable performance in high-stress environments.
• Enhanced corrosion resistance provided by the zinc-plated steel construction, extending the fastener's service life in various industrial conditions.
• Reliable and precise threading with a Class 3A UNC coarse thread fit, facilitating easier and faster assembly while maintaining a secure connection.
• Optimized for high-volume assembly with a fully threaded, right-hand design that speeds up installation and provides consistent clamping force along the entire bolt length.
• Wide, rounded head profile offers an increased bearing surface for better load distribution and reduces the risk of surface damage to connected materials.
• Guaranteed dimensional consistency and interchangeability, manufactured to meet ASME B18.5 standards for reliable performance and easy sourcing.

Professional Applications & Engineering Value

This Grade 5 Zinc-Plated Steel Carriage Bolt is engineered to solve critical challenges in heavy-duty industrial assembly. The square neck design is a key engineering feature that prevents rotation when tightening the nut, making it ideal for wood-to-metal connections, structural framing, and machinery where vibration resistance is paramount. The zinc plating provides a protective barrier against rust and corrosion, essential for outdoor equipment, agricultural machinery, and construction applications exposed to harsh environments. With its UNC coarse thread and Class 3A fit, it ensures quick, reliable installation in softwoods and metals, reducing assembly time while maintaining a high-strength, 120,000 psi tensile connection that withstands dynamic loads and stress.

Specification Summary & Compliance

This carriage bolt features a 1/4"-20 UNC coarse thread with a precision Class 3A thread fit for superior engagement. It is manufactured from zinc-plated steel with a hardness of Rockwell C25 and meets the dimensional requirements of ASME B18.5 and material specifications of SAE J429. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for use in various industrial and commercial applications.