S-92620A111 1/4"-32 x 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance with zinc yellow-chromate plating extends service life in harsh industrial environments, minimizing maintenance needs.
• Precision UNEF extra fine threading provides enhanced grip and vibration resistance, ideal for fine adjustments and secure fastening in thin materials.
• Class 2A thread fit guarantees consistent, easy assembly while maintaining tight tolerances for repeatable installations.
• Grade 8 strength classification and Rockwell C33 hardness deliver durability under heavy loads, suitable for demanding mechanical and structural uses.
• Fully threaded design allows for maximum engagement along the entire length, improving load distribution and connection integrity.
• Compliance with ASME B18.2.1 and SAE J429 standards ensures interchangeability and reliability in OEM and MRO applications.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in industrial settings, such as vibration loosening and corrosion-induced degradation. The extra fine UNEF thread (1/4"-32) offers finer pitch control, making it perfect for applications requiring precise clamping force in thin-section components, like machinery housings or electronic enclosures. Made from high-strength steel and finished with zinc yellow-chromate plating, it combats rust and chemical exposure, extending lifespan in outdoor or humid conditions. Its fully threaded and external hex drive design facilitates quick installation with standard tools, reducing assembly time while ensuring consistent performance in heavy-duty equipment, automotive assemblies, and construction projects where reliability is non-negotiable.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances for smooth assembly and is manufactured in accordance with ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. It features a right-hand UNEF thread with extra fine spacing (32 TPI), a length of 3/4", and meets industry standards for high tensile strength and hardness. Compliant with common regulatory requirements, it is suitable for use in applications demanding verified performance and quality assurance.