S-91257A167 1/2"-13 x 12" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with Grade 8 classification, providing a tensile strength of 150,000 psi and Rockwell C33 hardness for reliable performance in high-stress applications.
• Superior corrosion resistance due to the zinc yellow-chromate plating, extending service life in harsh industrial environments.
• Easy installation and removal with an external hex drive and 3/4" head width, allowing for standard wrench use and reducing assembly time.
• Optimized load distribution from the 1/2"-13 UNC coarse thread design, ensuring secure fastening in materials like steel and heavy machinery.
• Reduced weight and material use with partial threading, making it ideal for applications where full threading isn't necessary without compromising grip strength.
• Precise thread fit with Class 2A tolerance, minimizing the risk of cross-threading and ensuring consistent, reliable connections.
• Compliance with industry standards including ASME B18.2.1 and SAE J429, guaranteeing quality and interoperability in professional settings.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial applications, such as construction, machinery assembly, and automotive frameworks. Its steel material and zinc yellow-chromate plating provide robust corrosion resistance, reducing maintenance costs in corrosive environments. The 1/2"-13 UNC coarse thread and partial threading enhance grip and ease of installation in thick materials, while the external hex drive ensures quick, tool-friendly fastening. Ideal for securing structural components, it delivers reliable performance under high vibration and load, supported by its high tensile strength and hardness. This screw is a go-to solution for engineers seeking durability and compliance in demanding industrial hex screw applications.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including Class 2A thread fit for consistent accuracy and UNC coarse threads with a size of 1/2"-13. It meets ASME B18.2.1 and SAE J429 specifications, ensuring reliable manufacturing quality. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental safety and industrial reliability.