S-91251A295 1/4"-28 x 1 3/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions
• Precise Class 3A thread fit guarantees secure, vibration-resistant fastening in critical assemblies
• Partially threaded design provides optimal grip and alignment for varied material thicknesses
• Hex socket drive enables easy installation in confined spaces with standard tools
• Fine thread spacing (UNF) delivers enhanced clamping force and reduced loosening risks
• Compliance with ASTM A574 ensures consistent quality and material integrity

Professional Applications & Engineering Value

These 1/4"-28 UNF socket head cap screws are engineered to address common industrial challenges like vibration-induced loosening and corrosion in demanding applications. Constructed from black-oxide alloy steel, they offer enhanced durability and resistance to environmental factors, making them suitable for machinery, automotive, and aerospace assemblies. The Class 3A thread fit and fine thread spacing provide superior clamping force and stability, reducing maintenance needs. With a Rockwell C37 hardness and partially threaded rod design, they ensure reliable performance in high-stress environments while facilitating precise alignment in complex engineering projects.

Specification Summary & Compliance

This product features a Class 3A thread fit with UNF fine thread spacing, ensuring tight tolerances per industry standards. Manufactured to meet ASTM A574 specifications, it includes compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally conscious procurement. The inch-based dimensions, including a minimum thread length of 1", provide consistent performance for industrial fastener requirements.