S-90185A555 1/4"-20 x 3" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance with a square neck design that securely locks into materials, preventing spinning during installation and use.
• Enhanced corrosion resistance from the zinc-plated steel construction, ensuring long-term durability in harsh industrial environments.
• High tensile strength of 120,000 psi and Grade 5 classification for reliable performance in heavy-duty applications.
• Consistent and reliable fastening with fully threaded UNC coarse threads and Class 2A fit, enabling quick assembly and secure hold.
• Wide, rounded head design distributes clamping force evenly, reducing surface damage and improving load distribution.
• Rockwell C25 hardness provides excellent wear resistance, maintaining structural integrity under repetitive stress.
• Compliance with major industry standards including ASME B18.5 and SAE J429, ensuring quality and interoperability in professional settings.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to address common challenges in industrial fastening, such as vibration-induced loosening and environmental corrosion. The square neck integrates seamlessly into pre-drilled holes, providing unmatched anti-rotation that is critical for structural assemblies in machinery, construction, and transportation equipment. Its UNC coarse threading and Class 2A fit allow for rapid installation with standard tools, reducing labor time while maintaining precise alignment. The zinc plating offers a protective barrier against moisture and chemicals, extending service life in outdoor or corrosive settings. Ideal for heavy-duty applications, this bolt ensures reliable performance in frameworks, trailers, and agricultural machinery, where high tensile strength and durability are non-negotiable.

Specification Summary & Compliance

This carriage bolt features a 1/4"-20 UNC coarse thread with Class 2A tolerance for consistent fit and ease of assembly. It meets ASME B18.5 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial uses.