S-90185A427 3/8"-16 x 5 1/2" 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 ensuring reliable, long-term fastening.
• High tensile strength of 120,000 psi provides exceptional load-bearing capacity, making it ideal for heavy-duty structural and machinery applications.
• Durable zinc-plated steel construction offers excellent corrosion resistance, extending the bolt's service life in harsh industrial environments.
• Class 3A thread fit with UNC coarse threading ensures precise, easy engagement and high resistance to vibration loosening in demanding settings.
• Fully threaded design allows for maximum grip length and flexibility in material thickness, accommodating various assembly requirements.
• Grade 5 strength classification guarantees consistent mechanical properties and reliability for critical fastening tasks.
• Rounded head profile reduces risk of snagging and provides a smoother, safer surface in applications where protrusion is a concern.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to address common industrial challenges such as joint failure, vibration-induced loosening, and corrosion. The square neck design effectively counters rotation during torque application, which is critical in wood-to-metal and structural steel connections. Its UNC coarse thread and Class 3A fit provide superior holding power in soft materials like wood and composite, while the zinc plating protects against rust in outdoor or humid conditions. With a Rockwell C25 hardness and 120,000 psi tensile strength, it withstands heavy loads and impacts in construction, agricultural equipment, and transportation frameworks, ensuring long-term integrity and reducing maintenance frequency.

Specification Summary & Compliance

This carriage bolt features a 3/8"-16 UNC coarse thread with Class 3A thread fit for high precision and durability. It complies with ASME B18.5 and SAE J429 standards, ensuring consistent manufacturing quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its safety and sustainability for industrial use.