S-90185A148 1/2"-13 x 7" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Enhanced anti-rotation security with integrated square neck design that prevents spinning during installation and under vibration
• Superior corrosion resistance through black-oxide steel finish, extending service life in demanding industrial environments
• High-strength performance with Grade 5 classification and 120,000 psi tensile strength for reliable heavy-duty applications
• Optimized thread engagement through UNC coarse threading and Class 2A fit, ensuring faster assembly and reduced cross-threading risk
• Exceptional durability backed by Rockwell C25 hardness, maintaining structural integrity under repeated stress
• Wide compatibility with rounded carriage head profile that sits flush in pre-drilled countersunk surfaces
• Full-length threading providing maximum fastening flexibility across the entire 7" length for variable material thicknesses

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers critical engineering solutions where vibration resistance and structural integrity are paramount. The black-oxide steel construction provides essential corrosion protection for outdoor equipment, agricultural machinery, and structural steel connections exposed to environmental elements. The square neck design fundamentally solves rotation problems during nut tightening, eliminating the need for secondary locking mechanisms in wood-to-metal and structural applications. With UNC coarse threading and full-length threads, installation time is significantly reduced in heavy construction, trailer manufacturing, and industrial framing applications. The combination of 120,000 psi tensile strength and controlled hardness makes this fastener ideal for load-bearing connections where both strength and impact resistance are required.

Specification Summary & Compliance

This carriage bolt maintains Class 2A thread fit tolerance for consistent assembly performance and features 1/2"-13 UNC coarse thread specifications. Manufacturing complies with ASME B18.5 and SAE J429 Grade 5 standards for dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.