S-92620A245 1/2"-20 x 1 3/8" 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 classification, supporting heavy-duty applications and reducing failure risks
• Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh industrial environments
• Precise thread engagement with Class 2A fit and UNF fine threads, ensuring reliable fastening and vibration resistance
• High tensile strength of 150,000 PSI and Rockwell C33 hardness, providing robust performance under extreme loads
• Optimized partial threading design for better grip and stress distribution in critical assemblies
• Easy installation and removal with external hex drive and standard 3/4" head width, compatible with common tools
• Compliance with industry standards including ASME B18.2.1 and SAE J429, guaranteeing quality and interchangeability

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for demanding industrial settings where reliability is non-negotiable. The steel construction combined with zinc yellow-chromate plating offers excellent protection against corrosion, making it ideal for outdoor machinery, automotive assemblies, and structural frameworks exposed to moisture or chemicals. Its 1/2"-20 UNF fine thread and Class 2A thread fit ensure tight, secure connections that resist loosening under vibration, common in heavy equipment and aerospace components. The partial threading design enhances clamping force distribution, reducing stress concentration and preventing joint failure. By meeting ASME B18.2.1 and SAE J429 specifications, this fastener delivers consistent performance, minimizing downtime and maintenance costs in industrial applications.

Specification Summary & Compliance

This product adheres to precise dimensional standards with Class 2A thread fit and UNF fine thread spacing, ensuring accurate engagement and interchangeability. It conforms to ASME B18.2.1 and SAE J429 manufacturing specifications for hex head screws. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial and international markets without hazardous substances.