S-97000A521 3/8"-16 x 1" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional strength for heavy loads with Grade 8 classification and 150,000 PSI tensile strength, ensuring reliable performance in demanding applications.
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial environments.
• Secure, non-rotating installation due to the square neck design, which prevents spinning during tightening for efficient assembly.
• Maximum holding power from fully threaded 3/8"-16 UNC coarse threads, offering excellent grip and vibration resistance.
• High durability and hardness with Rockwell C33 rating, reducing wear and deformation under stress.
• Wide, rounded carriage head for easy installation and a finished appearance, distributing load effectively.
• Compliance with industry standards including ASME B18.5 and SAE J429, ensuring consistent quality and interchangeability.

Professional Applications & Engineering Value

This Grade 8 carriage bolt is engineered to address critical challenges in heavy machinery, construction, and automotive sectors, where vibration and high stress are common. The zinc yellow-chromate plating provides robust protection against rust and corrosion, making it ideal for outdoor or humid conditions. Its fully threaded 3/8"-16 UNC coarse thread pattern ensures rapid installation and superior clamping force, while the square neck design locks securely into materials to prevent rotation during use. This combination of high tensile strength and precise manufacturing reduces the risk of fastener failure, enhancing safety and longevity in structural assemblies, equipment frames, and other industrial applications that demand reliable, high-performance fastening solutions.

Specification Summary & Compliance

This carriage bolt features a Class 2A thread fit for standard tolerance and easy assembly, with UNC coarse threading (3/8"-16) and a right-hand direction. It complies with ASME B18.5 and SAE J429 specifications, ensuring dimensional accuracy and material consistency. The product meets common industry regulations for quality and is manufactured to provide reliable performance in various engineering environments.