S-90185A542 1/4"-20 x 1" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior Anti-Rotation Performance - Square neck design securely locks into materials, preventing bolt spin during installation and vibration
• Heavy-Duty Strength Rating - Grade 5 classification with 120,000 psi tensile strength ensures reliable performance in demanding applications
• Enhanced Corrosion Resistance - Zinc-plated steel construction provides durable protection against rust and environmental degradation
• Optimized Installation Efficiency - Wide rounded head design offers better bearing surface while UNC coarse threads enable faster assembly
• Precision Thread Compatibility - Class 2A thread fit ensures smooth engagement with standard nuts and threaded components
• Vibration-Resistant Design - Fully threaded shank with Rockwell C25 hardness maintains integrity under dynamic loading conditions
• Regulatory Compliance Assurance - Meets industry standards for safety and environmental requirements in professional applications

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers exceptional engineering value through its zinc-plated steel construction and specialized square neck design, specifically engineered to solve common industrial fastening challenges. The wide rounded head distributes clamping force evenly across surfaces, while the square neck prevents rotation during torque application - a critical feature in wood-to-metal connections and structural assemblies where access is limited to one side. The UNC coarse threading with Class 2A fit ensures reliable engagement in various materials, from structural steel to heavy timber. With 120,000 psi tensile strength and Rockwell C25 hardness, this fully threaded carriage bolt maintains integrity in construction equipment, agricultural machinery, and transportation applications where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

This 1/4"-20 carriage bolt features precision UNC coarse threading with Class 2A fit tolerance for optimal thread engagement. Manufactured to ASME B18.5 dimensional specifications and SAE J429 Grade 5 mechanical requirements, ensuring consistent performance across industrial applications. The product is fully compliant with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations, meeting the latest standards for hazardous substance restrictions and chemical safety in professional and industrial environments.