S-91251A096 3-48 x 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With 170,000 psi tensile strength, these screws provide reliable holding power in high-stress assemblies, reducing the risk of fastener failure.
• Superior Corrosion Resistance – The black-oxide coating on alloy steel offers enhanced protection against rust and environmental degradation, extending service life in harsh conditions.
• Precise Thread Fit – Class 3A thread fit ensures tight, secure fastening with minimal play, improving assembly accuracy and vibration resistance.
• High Durability & Hardness – Rockwell C37 hardness maintains screw integrity under repeated loads, preventing stripping and wear in demanding applications.
• Easy Installation with Hex Drive – The 5/64" hex drive allows for straightforward installation in confined spaces using standard tools, speeding up assembly processes.
• Compliance with Industry Standards – Meets ASTM A574 specifications and is RoHS 3/REACH compliant, ensuring material consistency and environmental safety for global supply chains.
• Versatile Coarse Thread Design – UNC coarse threads enable quick engagement and are ideal for materials where fine threads might be prone to cross-threading or damage.

Professional Applications & Engineering Value

Engineered for precision and reliability, these socket head cap screws are crafted from black-oxide alloy steel to address common industrial challenges such as corrosion, high tensile stress, and assembly efficiency. The Class 3A thread fit and coarse UNC threads ensure secure fastening in materials like metals and composites, reducing the risk of loosening under vibration. With a fully threaded design and 5/64" hex drive, they facilitate easy installation in tight spaces, making them ideal for machinery, automotive components, and electronic enclosures where durability and precise torque application are critical. The combination of high hardness and tensile strength supports long-term performance in demanding applications, minimizing maintenance needs and downtime.

Specification Summary & Compliance

This product adheres to Class 3A thread fit for precise dimensional accuracy and UNC coarse thread standards. It is manufactured in compliance with ASTM A574 specifications, ensuring consistent quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its environmental safety and suitability for international markets.