S-90185A219 1/4"-20 x 7/8" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional tensile strength with Grade 5 rating and 120,000 psi capability for reliable performance in demanding applications
• Superior anti-rotation performance thanks to the integrated square neck design that prevents spinning during installation
• Enhanced corrosion resistance through zinc-plated steel construction for extended service life in various environments
• Precision thread engagement with Class 3A UNC coarse threads ensuring secure fastening and easy installation
• Optimized load distribution from the wide rounded head profile that minimizes surface damage
• Consistent hardness performance with Rockwell C25 rating maintaining structural integrity under stress
• Full regulatory compliance meeting ASME B18.5 standards and environmental regulations for worry-free procurement

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers critical engineering solutions where vibration resistance and structural integrity are paramount. The zinc-plated steel construction provides essential corrosion protection for outdoor equipment, agricultural machinery, and construction applications where environmental exposure is a concern. The square neck design fundamentally solves the common problem of fastener rotation during assembly, making it ideal for wood-to-metal connections, trailer manufacturing, and structural framing where access is limited to one side. The UNC coarse threading ensures rapid installation and reliable performance in softer materials, while the Class 3A thread fit guarantees precise engagement for critical joints. These carriage bolts are engineered to maintain clamping force in high-vibration environments, preventing costly maintenance and ensuring long-term reliability in industrial settings.

Specification Summary & Compliance

This heavy-duty fastener features precision 1/4"-20 UNC coarse threads with Class 3A thread fit for superior engagement and meets ASME B18.5 manufacturing specifications. The bolt maintains dimensional accuracy with a 7/8" length, 0.594" head diameter, and integrated square neck (0.26" width) for anti-rotation performance. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications while maintaining Grade 5 mechanical properties and 120,000 psi tensile strength.