S-90185A439 3/4"-10 x 2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior load-bearing capacity with Grade 5 classification and 120,000 PSI tensile strength for reliable performance in demanding applications.
• Enhanced corrosion resistance through zinc-plated steel construction, extending service life in harsh industrial environments.
• Secure anti-rotation installation enabled by the square neck design, preventing bolt spinning during tightening.
• Precise thread engagement with Class 3A fit and UNC coarse threading for faster assembly and reduced cross-threading risk.
• Consistent hardness and durability at Rockwell C25, ensuring dimensional stability under stress.
• Broad regulatory compliance including ASME B18.5, SAE J429, RoHS 3, and REACH for assured quality and environmental safety.
• Versatile fully-threaded design allowing flexible placement and uniform stress distribution along the entire 2" length.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt delivers critical reliability for structural connections in construction, heavy machinery, and transportation equipment. The square neck securely locks into materials, eliminating rotation during nut tightening—saving installation time and reducing assembly errors. With UNC coarse threads and Class 3A thread fit, it resists vibration loosening while enabling quick alignment in steel framing, trailer beds, and agricultural implements. The zinc plating provides a sacrificial layer against rust, making it suitable for outdoor or high-moisture environments. Engineers specify this bolt for applications where 120,000 PSI tensile strength and consistent Rockwell C25 hardness are necessary to maintain joint integrity under dynamic loads.

Specification Summary & Compliance

This carriage bolt meets ASME B18.5 and SAE J429 specifications for dimensional accuracy and mechanical properties. Threads conform to 3/4"-10 UNC coarse thread standards with Class 3A tolerance for precise fit. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no restricted substances are used. Manufactured from zinc-plated steel, it maintains consistent performance across industrial applications where verified material traceability and environmental safety are required.