S-91286A102 1/4"-20 x 3/8" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional durability with Grade 8 strength rating, supporting heavy-duty applications and reducing failure risks
• Superior corrosion resistance from zinc-flake coating, extending service life in harsh industrial environments
• High tensile strength of 150,000 psi ensures reliable performance under extreme mechanical stress
• Precise Class 2A thread fit for smooth assembly and secure fastening in demanding conditions
• Coarse UNC threading provides quick installation and excellent grip in various materials
• Full threading design allows consistent engagement along the entire 3/8" length for uniform load distribution
• External hex drive compatibility enables easy installation with standard tools, reducing assembly time

Professional Applications & Engineering Value

Engineered for industrial applications requiring maximum reliability, this Grade 8 hex head screw delivers exceptional performance in heavy machinery, construction equipment, and automotive assemblies. The steel construction with Rockwell C33 hardness provides outstanding resistance to wear and deformation, while the zinc-flake coating offers superior protection against corrosion in challenging environments. The 1/4"-20 UNC coarse thread with Class 2A fit ensures quick, secure fastening in high-vibration applications, reducing maintenance needs and downtime. These fully threaded screws with external hex drive are ideal for applications demanding consistent clamping force and easy installation with standard tools.

Specification Summary & Compliance

This fastener features Class 2A thread fit with UNC coarse spacing and complies with ASME B18.2.1/SAE J429 specifications. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental responsibility and regulatory adherence for industrial use.