S-92620A752 1/2"-20 x 4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load Capacity - Grade 8 classification with 150,000 psi tensile strength ensures reliable performance in high-stress industrial applications
• Superior Corrosion Protection - Zinc yellow-chromate plating provides excellent resistance against rust and environmental degradation
• Precision Thread Engagement - Class 2A thread fit with UNF fine threading delivers secure fastening and vibration resistance
• Enhanced Durability - Rockwell C33 hardness rating maintains structural integrity under repeated stress and heavy loads
• Optimal Torque Transfer - External hex drive with 3/4" head width allows for secure tool engagement and efficient installation
• Full Thread Coverage - 4" length with complete threading provides maximum grip strength across the entire fastener
• Industry Compliance - Meets ASME B18.2.1 and SAE J429 specifications for guaranteed quality and interoperability

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value in demanding industrial environments where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness makes it ideal for heavy machinery, structural assemblies, and equipment requiring reliable high-strength fastening. The UNF fine thread design with Class 2A fit ensures precise engagement that resists loosening under vibration, while the zinc yellow-chromate plating provides critical corrosion protection in harsh operating conditions. The external hex drive configuration allows for high-torque installation, making these steel fasteners perfect for construction, manufacturing, and automotive applications where durability and performance are paramount.

Specification Summary & Compliance

This 1/2"-20 hex head screw features precision Class 2A thread fit with UNF fine threading and right-hand thread direction. The fastener maintains dimensional accuracy per ASME B18.2.1 specifications and meets SAE J429 standards for Grade 8 mechanical properties. Manufactured from high-strength steel with zinc yellow-chromate plating finish, this fully threaded 4" length screw delivers consistent performance and compliance with industrial quality requirements.