S-91286A116 1/4"-20 x 1 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Grade 8 classification and 150,000 psi tensile strength, ensuring reliable performance under high stress.
• Superior corrosion resistance provided by the zinc-flake coating, extending service life in harsh industrial environments.
• Optimized for high-torque installation thanks to the external hex head design, allowing for secure fastening with standard tools.
• Reliable thread engagement and vibration resistance from the coarse UNC thread and Class 2A fit, minimizing loosening in dynamic applications.
• Reduced weight and material usage with partial threading, ideal for applications where full threading is not necessary.
• Guaranteed dimensional consistency as it meets ASME B18.2.1 and SAE J429 standards, ensuring interchangeability and fit.
• Safe for regulated industries with compliance to RoHS 3 and REACH, supporting global supply chain requirements.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where failure is not an option. The steel material combined with a Rockwell C33 hardness provides excellent resistance to wear and deformation under load. Its 1/4"-20 coarse UNC thread and partial threading design enhance grip in softer materials and reduce stress concentration, making it ideal for structural connections and equipment that experiences vibration. The zinc-flake coated finish offers robust protection against corrosion, significantly extending maintenance intervals in outdoor or chemically aggressive settings. By adhering to ASME B18.2.1 specifications, it ensures precise fit and performance, reducing installation errors and downtime in industrial operations.

Specification Summary & Compliance

This fastener features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for consistent engagement and assembly ease. It is manufactured in compliance with ASME B18.2.1 and SAE J429 standards, ensuring dimensional accuracy and mechanical properties. The product is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for use in various global markets.