S-97000A510 1/4"-20 x 3/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity - With a tensile strength of 150,000 PSI, this bolt reliably handles extreme mechanical stresses in demanding industrial environments.
• Superior Corrosion Resistance - The zinc yellow-chromate plating provides a durable protective barrier, significantly extending service life in harsh or outdoor conditions.
• Secure Anti-Rotation Locking - The integrated square neck design firmly embeds into the material, preventing the bolt from spinning during installation and under vibration.
• High-Strength Material Integrity - As a Grade 8 fastener with a Rockwell C33 hardness, it offers excellent resistance to stretching and deformation.
• Optimized for Quick Assembly - The coarse UNC thread and Class 2A fit ensure easy, fast starts and smooth installation, reducing labor time.
• Wide, Rounded Head for Enhanced Clamping - The 0.594" diameter carriage head distributes load over a larger area, protecting soft materials and providing a finished appearance.
• Guaranteed Quality and Interchangeability - Manufactured to meet ASME B18.5 and SAE J429 standards, ensuring precise dimensions and reliable performance in standardized applications.

Professional Applications & Engineering Value

This Grade 8 carriage bolt is engineered to solve critical challenges in heavy-duty industrial applications. Its 150,000 PSI tensile strength and Rockwell C33 hardness make it ideal for high-stress connections in machinery, structural steel frames, and truck assemblies, where failure is not an option. The zinc yellow-chromate plating combats rust and corrosion, a vital feature for outdoor equipment or environments exposed to moisture. The square neck is a key engineering feature that locks the bolt in place, eliminating rotation during nut tightening and under operational vibrations. This ensures a secure, permanent fastening solution in wood, metal, and other materials, providing long-term reliability and reducing maintenance needs.

Specification Summary & Compliance

This 1/4"-20 UNC carriage bolt features a Class 2A thread fit for standard clearance and easy assembly. It is fully threaded with a coarse thread spacing and right-hand direction. Key dimensions include a 3/4" length, 0.594" head diameter, and a square neck measuring 0.16" in length and 0.26" in width. The fastener is manufactured in compliance with ASME B18.5 and SAE J429 specifications, guaranteeing dimensional accuracy, material properties, and performance consistency for professional use.