S-91773A291 12-24 x 1/2" ASME B18.6.3 Stainless Steel Round Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for demanding industrial applications
• Reliable fastening performance through Class 2A thread fit and UNC coarse threads that resist loosening under vibration
• Optimized drive engagement with Phillips No. 3 drive design for secure tool mating and reduced cam-out risk
• Full-length threading providing maximum grip and load distribution across the entire fastener length
• Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and performance
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

These 12-24 UNC coarse thread rounded head screws deliver critical performance advantages for industrial assembly applications where vibration resistance and corrosion protection are paramount. The combination of 18-8 stainless steel material and passivated surface treatment creates a barrier against chemical exposure and atmospheric corrosion, significantly extending service life in manufacturing equipment, electrical enclosures, and outdoor installations. The fully threaded design ensures maximum engagement in tapped holes or nuts, while the Phillips drive system provides efficient installation with standard tools. Engineered to ASME B18.6.3 standards, these fasteners maintain precise dimensional tolerances for consistent performance in high-volume production environments where reliability cannot be compromised.

Specification Summary & Compliance

This rounded head screw features precision 12-24 UNC coarse threads with Class 2A thread fit for reliable assembly tolerance. Manufacturing complies with ASME B18.6.3 dimensional specifications, ensuring interchangeability and proper function. The fastener meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) regulations for chemical safety. With 100,000 psi tensile strength and Rockwell B100 hardness, the mechanical properties exceed requirements for most industrial fastening applications.