S-91251A329 5/16"-24 x 1 7/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable finish, extending service life in harsh industrial environments.
• Partially threaded design with fine UNF threads allows for precise clamping force control and improved load distribution in fine-adjustment applications.
• 1/4" hex drive socket head enables easy installation and high torque application with standard tools, minimizing assembly time and effort.
• Rockwell C37 hardness ensures excellent wear resistance and durability, maintaining integrity under repeated use and mechanical stress.
• Compliance with RoHS 3 and REACH guarantees environmental safety and regulatory adherence, making it suitable for global supply chains and sensitive industries.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in precision assembly and high-load scenarios. Its Class 3A thread fit and fine UNF threads provide exceptional accuracy, reducing the risk of cross-threading and ensuring stable connections in vibrating equipment like automotive engines, aerospace components, and heavy machinery. The partially threaded configuration allows for optimal grip and stress distribution, preventing joint loosening in dynamic applications. Made from high-strength alloy steel with a black-oxide surface treatment, it resists rust and wear in corrosive or high-temperature environments, enhancing longevity. Ideal for industrial fastening in robotics, manufacturing fixtures, and precision instruments, this screw delivers reliable performance where tensile strength and dimensional precision are paramount.

Specification Summary & Compliance

This socket head cap screw adheres to inch system measurements with a Class 3A thread fit and UNF fine thread specification (5/16"-24), ensuring high precision and interchangeability. It meets ASTM A574 manufacturing standards for quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for environmental and health standards in industrial use.