S-91257A986 1"-8 x 11" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With a 150,000 psi rating, this screw provides reliable holding power for the most demanding heavy-duty applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance – The zinc yellow-chromate plating offers enhanced protection against rust and environmental degradation, extending service life in harsh conditions.
• High Hardness & Durability – Rockwell C33 hardness ensures the screw maintains its shape and thread integrity under high stress and repeated use.
• Optimized Thread Design – The 1"-8 UNC coarse thread and Class 2A fit enable quicker installation and better grip in a variety of materials, improving assembly efficiency.
• Secure External Hex Drive – The hex head allows for high torque application with standard tools, ensuring tight, secure fastening without slippage.
• Partial Threading for Versatility – Designed with a minimum 2 1/2" thread length, it provides flexibility for applications where unthreaded shank strength is critical.
• Compliance with Industry Standards – Meets ASME B18.2.1 and SAE J429 specifications, ensuring consistent quality and performance for industrial use.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and structural assemblies where high tensile strength and corrosion resistance are paramount. The steel material and zinc yellow-chromate plating work together to withstand extreme loads and harsh environments, minimizing maintenance needs. Its 1"-8 UNC coarse thread and external hex drive facilitate rapid installation in thick materials, reducing labor time while ensuring a secure fit. Ideal for use in industrial fastening systems, this screw helps prevent joint failure and enhances the longevity of equipment, supporting efficient and safe operations in sectors like manufacturing, automotive, and infrastructure.

Specification Summary & Compliance

This screw features a Class 2A thread fit for consistent engagement and inch system dimensions, including an 11" length and 1"-8 UNC coarse thread. It complies with ASME B18.2.1 and SAE J429 standards, ensuring precise manufacturing and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.