S-91251A953 3-48 x 1" 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 demanding applications.
• Superior corrosion resistance from the black-oxide finish prolongs service life in harsh industrial environments, minimizing maintenance and replacement costs.
• Precision Class 3A thread fit guarantees tight, secure fastening with minimal backlash, ideal for assemblies requiring exact alignment and vibration resistance.
• High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining thread integrity and drive engagement through repeated use.
• Hex socket drive design allows for high-torque installation in confined spaces, speeding up assembly while reducing tool slippage and damage.
• Compliance with ASTM A574 and RoHS 3 ensures material consistency and environmental safety, meeting rigorous industry standards for quality and sustainability.
• Partially threaded shank offers flexibility for applications requiring both clamped and unthreaded sections, enhancing versatility in mechanical designs.

Professional Applications & Engineering Value

These 3-48 UNC Socket Head Cap Screws are engineered to address common industrial challenges, such as vibration-induced loosening and environmental degradation. The black-oxide alloy steel construction provides a durable, corrosion-resistant barrier, essential for machinery exposed to moisture or chemicals. With a coarse thread spacing and Class 3A thread fit, they deliver superior clamping force and ease of assembly in high-vibration settings like automotive, aerospace, and heavy equipment. The hex drive and standardized socket head profile enable efficient installation with common tools, reducing labor time while ensuring consistent torque application. Ideal for precision components, these screws help maintain structural integrity and extend the lifecycle of critical assemblies.

Specification Summary & Compliance

This product adheres to UNC thread standards with a Class 3A thread fit for precise dimensional accuracy. Manufacturing follows ASTM A574 specifications, ensuring material and performance reliability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for industrial use.