S-90185A879 3/4"-10 x 4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc-plated steel construction, extending service life in harsh environments
• Positive anti-rotation locking with integrated square neck design that prevents spinning during installation
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and secure fastening
• Enhanced durability with Rockwell C25 hardness rating that maintains structural integrity under stress
• Wide bearing surface from the rounded carriage head design that distributes load evenly and prevents pull-through
• Full-threaded versatility allowing installation at any point along the 4" length for flexible application requirements

Professional Applications & Engineering Value

These Grade 5 carriage bolts deliver critical engineering solutions where vibration resistance and structural integrity are paramount. The zinc-plated steel construction provides essential corrosion protection for outdoor structures, agricultural equipment, and construction applications exposed to environmental elements. The integrated square neck design mechanically locks into materials during installation, eliminating the need for secondary locking mechanisms and preventing rotational movement that compromises joint integrity. With UNC coarse threading and full threading along the entire 4" length, these fasteners offer superior pull-out resistance in wood, metal, and composite materials. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures these carriage bolts maintain clamping force under dynamic loads and vibration, making them ideal for structural connections in trailer manufacturing, heavy equipment, and industrial framing applications where reliability cannot be compromised.

Specification Summary & Compliance

This 3/4"-10 carriage bolt features precise Class 2A thread fit tolerances with UNC coarse threading and right-hand thread direction. Manufactured to meet ASME B18.5 dimensional specifications and SAE J429 Grade 5 mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety. The fastener demonstrates complete adherence to industry standards for dimensional accuracy, mechanical performance, and environmental responsibility.