S-90185A712 1/2"-13 x 1 1/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance with a square neck design that locks securely into materials, preventing spinning during installation and use.
• Enhanced corrosion resistance from the zinc-plated steel construction, ensuring long-term durability in various industrial environments.
• High tensile strength of 120,000 psi (Grade 5) for reliable load-bearing capacity in demanding structural and machinery applications.
• Excellent thread engagement with coarse UNC threading and Class 2A fit, facilitating faster assembly and reducing cross-threading risks.
• Wide, rounded head profile distributes clamping force evenly, minimizing surface damage and providing a secure, finished appearance.
• Full threading along the entire shank allows for versatile nut placement and consistent fastening depth across different material thicknesses.
• Compliance with major industry standards including ASME B18.5, ensuring dimensional accuracy and interchangeability in professional applications.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and corrosion. The square neck embeds firmly into wood or metal, providing exceptional anti-rotation that is vital for structural connections in trailers, agricultural equipment, and construction frameworks. Its coarse UNC thread and Class 2A fit ensure rapid, reliable installation even in rough conditions, reducing labor time. The zinc plating offers a protective barrier against moisture and chemicals, extending service life in outdoor or harsh environments. With a high tensile strength of 120,000 psi and Rockwell C25 hardness, it withstands heavy dynamic loads, making it a trusted choice for machinery, conveyor systems, and heavy-duty assembly where safety and durability are paramount.

Specification Summary & Compliance

This carriage bolt adheres to precise dimensional standards with a 1/2"-13 UNC coarse thread and Class 2A thread fit for consistent performance. It meets ASME B18.5 specifications, ensuring reliable manufacturing quality and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances for safe use in global markets.