S-90117A572 1/4"-20 x 3" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating that protects alloy steel in demanding industrial environments
• Exceptional mechanical strength with 170,000 psi tensile strength and Rockwell C37 hardness for heavy-duty applications
• Precise thread engagement with Class 3A thread fit ensuring reliable fastening and vibration resistance
• Optimized drive performance featuring hex socket design with 3/16" drive for secure tool engagement and high torque transmission
• Versatile partial threading allowing both threaded engagement and smooth shank functionality in assembly applications
• Industry-standard compliance meeting ASME B18.3 specifications for dimensional accuracy and performance reliability
• Enhanced safety and compatibility with RoHS 3 and REACH compliance for environmentally conscious manufacturing operations

Professional Applications & Engineering Value

These 1/4"-20 UNC socket head cap screws deliver exceptional engineering value in demanding industrial settings where vibration resistance and structural integrity are critical. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the high tensile strength required for machinery assembly, automotive components, and heavy equipment manufacturing. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of cross-threading and providing reliable fastening in high-stress applications. The partially threaded design offers flexibility in assembly, allowing the smooth shank section to function as a precision guide while the coarse UNC threads provide rapid installation and secure locking. These characteristics make them ideal for applications requiring repeated disassembly and reassembly without compromising thread integrity.

Specification Summary & Compliance

These socket head cap screws feature 1/4"-20 UNC coarse threads with Class 3A thread fit for precision engagement and dimensional accuracy. The manufacturing process adheres to ASME B18.3 standards ensuring consistent quality and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, making them suitable for global industrial applications. The partially threaded configuration provides minimum 1" thread length on the 3" overall length, while the standard socket head profile with hex drive ensures compatibility with industry-standard installation tools.