S-91205A053 2-56 x 3/16" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch thread locker, preventing loosening in high-stress applications
• Exceptional tensile strength of 170,000 psi for reliable performance in demanding industrial environments
• Corrosion-resistant black-oxide finish on alloy steel for enhanced durability and longevity
• Precise Class 3A thread fit ensuring smooth installation and secure fastening in UNC coarse threads
• Wide temperature tolerance from -70° to 250°F, maintaining integrity in extreme conditions
• Hex socket drive design with 5/64" drive size for easy installation in confined spaces
• Full compliance with industry standards including ASME B18.3 and ASTM A574 for guaranteed quality

Professional Applications & Engineering Value

These 2-56 UNC socket head cap screws with nylon patch thread locker provide critical vibration resistance in precision assemblies where reliability is paramount. The black-oxide alloy steel construction offers superior corrosion protection while maintaining the 170,000 psi tensile strength required for heavy-duty applications. The Class 3A thread fit ensures precise engagement in UNC coarse threads, reducing cross-threading risks during installation. Ideal for machinery, automotive, and electronic enclosures, these socket head cap screws deliver consistent performance in temperature-sensitive environments from -70° to 250°F, making them essential for industrial equipment subject to thermal cycling and mechanical stress.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with ASTM A574 material standards, featuring Class 3A thread fit for precision tolerance in UNC coarse threads. The 2-56 thread size with 3/16" length provides optimal fastening dimensions. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.