S-92620A545 1/4"-20 x 1 1/8" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress industrial applications
• Superior corrosion resistance through zinc yellow-chromate plating that protects against rust and extends service life
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and vibration resistance
• Maximum thread coverage through full threading along the entire 1-1/8" length for enhanced grip and distribution of stress
• High-grade material integrity with Rockwell C33 hardness maintaining dimensional stability under heavy loads
• Efficient installation and removal via external hex drive design that accommodates standard tools for quick assembly
• Regulatory compliance assurance meeting ASME B18.2.1 and SAE J429 standards for quality and safety

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical reliability in demanding environments where failure is not an option. The steel construction with Rockwell C33 hardness ensures the fastener maintains its structural integrity under extreme tension and shear forces, making it ideal for heavy machinery, construction equipment, and automotive assemblies. The UNC coarse thread design provides superior resistance to loosening from vibrations, while the zinc yellow-chromate plating creates a protective barrier against moisture, chemicals, and environmental factors that cause corrosion. With full threading along the entire 1-1/8" length, these screws distribute clamping force evenly across joined materials, preventing stress concentration points that lead to material fatigue. The external hex drive allows for high-torque installation with common industrial tools, streamlining assembly processes in manufacturing and maintenance operations.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances ensuring consistent performance and interchangeability. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, confirming absence of restricted hazardous substances. The 1/4"-20 UNC coarse thread with right-hand direction follows standardized inch system measurements for compatibility with existing industrial components and equipment.