S-91251A364 10-32 x 4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in critical assemblies.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic or high-vibration industrial environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish suitable for various operational conditions.
• Partially threaded design with fine UNF spacing allows for precise clamping control and secure fastening in applications requiring specific thread engagement lengths.
• Hex socket drive (5/32") enables high-torque installation with standard tools, facilitating efficient assembly and disassembly in confined spaces.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and adherence to international regulatory standards.
• Rockwell C37 hardness provides excellent wear resistance and durability, extending service life in demanding mechanical applications.

Professional Applications & Engineering Value

These 10-32 UNF socket head cap screws are engineered to address common industrial challenges such as vibration-induced loosening and material fatigue. The black-oxide alloy steel construction, combined with a Class 3A thread fit, ensures secure fastening in precision machinery, automotive assemblies, and aerospace components where tolerance integrity is critical. The fine thread spacing and partial threading allow for adjustable clamp load distribution, making them ideal for applications requiring repeated adjustments or access to internal components. Their high tensile strength and compliance with ASTM A574 provide reliability in heavy-duty environments, reducing maintenance needs and downtime.

Specification Summary & Compliance

This product adheres to Class 3A thread tolerances for precise fit, manufactured in accordance with ASTM A574 specifications. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring safety and sustainability. The UNF fine thread system and right-hand thread direction are standardized for compatibility with industrial equipment, supporting consistent performance across applications.