S-90185A546 1/4"-20 x 1 1/2" 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 ensuring stable, reliable fastening in high-vibration environments.
• Exceptional Tensile Strength: Grade 5 classification with 120,000 psi tensile strength provides robust load-bearing capacity for demanding structural and heavy-duty applications.
• Enhanced Corrosion Resistance: Zinc-plated steel construction offers reliable protection against rust and environmental degradation, extending service life in outdoor or humid conditions.
• Optimized Thread Engagement: Coarse UNC 1/4"-20 threads with Class 2A fit ensure quick assembly, superior grip in wood and soft materials, and reduced cross-threading risks.
• Consistent Hardness & Durability: Rockwell C25 hardness maintains structural integrity under stress, resisting wear and deformation in repetitive load scenarios.
• Wide Application Compatibility: Rounded carriage head with wide profile distributes clamping force evenly, minimizing surface damage while accommodating various material thicknesses.
• Regulatory Compliance Assurance: Meets ASME B18.5 and SAE J429 standards, with RoHS 3 and REACH compliance ensuring environmental safety and global market acceptance.

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers critical engineering solutions where vibration resistance and structural integrity are paramount. The zinc-plated steel construction combats corrosion in outdoor construction, agricultural equipment, and infrastructure projects, while the square neck mechanically locks into assemblies to prevent rotational failure—eliminating the need for additional locking components. With coarse UNC threads and Class 2A fit, it ensures rapid installation in wood, metal framing, and composite materials, reducing labor time. The 120,000 psi tensile strength and Rockwell C25 hardness provide reliable performance in heavy machinery, trailer manufacturing, and structural connections, where dynamic loads and stress cycles demand fatigue-resistant fasteners.

Specification Summary & Compliance

This 1/4"-20 carriage bolt features precise UNC coarse threading with Class 2A tolerance for consistent fit. Manufactured to ASME B18.5 and SAE J429 Grade 5 specifications, it guarantees dimensional accuracy and mechanical performance. The bolt is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial and international use.