S-90185A103 1/4"-20 x 1 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 locks securely into materials, preventing spinning during installation and use.
• High tensile strength of 120,000 PSI ensures reliable load-bearing capacity and structural integrity in demanding applications.
• Durable black-oxide steel construction provides excellent corrosion resistance, extending service life in various industrial environments.
• Fully threaded UNC coarse spacing allows for faster assembly and secure fastening in wood, metal, and other materials.
• Wide rounded head profile distributes clamping force evenly, reducing surface damage and improving finished appearance.
• Rockwell C25 hardness offers excellent wear resistance, maintaining thread integrity through repeated use.
• Right-hand threading with Class 2A fit ensures smooth installation and consistent performance with standard tools.

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers exceptional engineering value through its black-oxide steel composition and specialized design features. The square neck effectively prevents rotation during torque application, solving common installation challenges in wood-to-metal connections and structural frameworks. The fully threaded UNC coarse spacing provides superior grip in softer materials while allowing for quick assembly in high-volume production environments. With its 120,000 PSI tensile strength and Rockwell C25 hardness, this fastener maintains integrity under vibration and heavy loads, making it ideal for construction equipment, agricultural machinery, trailer assemblies, and industrial furniture where reliability is paramount. The combination of anti-rotation features and corrosion-resistant coating ensures long-term performance in demanding industrial applications.

Specification Summary & Compliance

This carriage bolt features precision 1/4"-20 UNC coarse thread spacing with Class 2A thread fit for consistent engagement and reliable performance. Manufactured to meet ASME B18.5 specifications and SAE J429 Grade 5 requirements, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict regulatory adherence.