S-91286A196 5/16"-24 x 2 1/2" 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 steel construction, providing 150,000 psi tensile strength for heavy-duty applications.
• Superior corrosion resistance from the zinc-flake coating, extending service life in harsh industrial environments.
• Reliable fastening performance with a Rockwell C33 hardness, ensuring the screw maintains integrity under high stress.
• Precise thread engagement due to the UNF fine thread and Class 2A fit, reducing the risk of stripping and ensuring secure connections.
• Easy installation and removal with the external hex drive and hex head design, allowing for high torque application with standard tools.
• Versatile partial threading that enables controlled clamping force, ideal for applications requiring precise joint security.
• Compliance with industry standards including ASME B18.2.1 and SAE J429, guaranteeing consistent quality and interoperability.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in demanding industrial settings, such as machinery assembly, automotive systems, and structural frameworks. The zinc-flake coated steel provides excellent protection against corrosion, reducing maintenance costs and downtime in environments exposed to moisture or chemicals. With a 150,000 psi tensile strength and Rockwell C33 hardness, it resists deformation and fatigue under heavy loads, ensuring long-term reliability. The UNF fine thread and partial threading design allow for precise tension control and vibration resistance, making it ideal for applications where loosening could lead to equipment failure. By meeting ASME B18.2.1 and other standards, this fastener delivers consistent performance, enhancing the safety and efficiency of your industrial assemblies.

Specification Summary & Compliance

This screw adheres to precise dimensional tolerances, including a Class 2A thread fit for reliable engagement and UNF fine thread specifications. It complies with ASME B18.2.1 and SAE J429 standards, ensuring manufacturing consistency. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental and safety regulations in global markets.