S-98060A270 1/4"-20 x 1 1/2" SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Enhanced Load-Bearing Capacity: Grade 5 classification and 120,000 psi tensile strength ensure reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Protection: Zinc-plated steel construction provides excellent resistance to rust and environmental degradation, extending service life in demanding conditions.
• Secure Anti-Rotation Design: Knurled neck beneath the rounded head grips firmly into materials, preventing spinning during installation and maintaining joint integrity.
• Optimized Thread Engagement: UNC coarse threading and Class 2A fit enable quicker assembly and better performance in softer materials or where vibration is a concern.
• Versatile Head Profile: Wide, rounded carriage head distributes clamping force evenly and sits flush, minimizing surface damage and improving aesthetic finish.
• Regulatory Compliance Assurance: Meets SAE J429, RoHS 3, and REACH standards, ensuring suitability for regulated industries and international supply chains.
• Durable Material Hardness: Rockwell C25 hardness provides a balance of strength and ductility, resisting wear and deformation under repeated loads.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to address common challenges in heavy-duty automotive, construction, and industrial assembly. The partially threaded UNC coarse thread design allows for efficient installation in wood, metal, and composite materials, reducing assembly time while maintaining high tensile strength. The knurled neck provides critical anti-rotation security, preventing loosening in vibrating environments—a common failure point in machinery and structural applications. With a zinc-plated finish, it offers enhanced corrosion resistance, making it suitable for outdoor or humid conditions without sacrificing mechanical performance. This combination of features ensures long-term reliability, reduces maintenance frequency, and supports compliance with rigorous industry specifications.

Specification Summary & Compliance

This carriage bolt features a 1/4"-20 UNC coarse thread with Class 2A tolerance for consistent fit and ease of assembly. Manufactured to SAE J429 specifications, it guarantees dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, adhering to environmental and safety regulations for hazardous substances. Key dimensions include a 1 1/2" length with a minimum thread length of 3/4", ensuring sufficient engagement for secure fastening in various material thicknesses.