S-94066A537 1/4"-20 x 1/2" ASME B18.6.3 Tamper-Resistant Drilled Spanner Stainless Steel Pan Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength delivering 80,000 PSI tensile strength and Rockwell B96 hardness for reliable performance under high stress
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent, vibration-resistant fastening in industrial assemblies
• Optimized drive efficiency featuring drilled spanner drive (No. 14) for secure tool engagement and reduced cam-out risk
• Enhanced head design with rounded pan profile and 0.492" diameter providing improved clearance and professional appearance
• Full-threaded construction maximizing grip length and load distribution across the entire 1/2" fastener length
• Regulatory compliance assurance meeting ASME B18.6.3 specifications while being RoHS 3 and REACH compliant for global applications

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 1/4"-20 UNC rounded head screws deliver critical performance advantages where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel composition, enhanced by passivated finish, provides exceptional protection against chemical exposure and atmospheric corrosion in manufacturing, marine, and food processing applications. The combination of coarse UNC threads with Class 2A fit ensures rapid installation and secure fastening in machinery, equipment frames, and structural assemblies where vibration resistance is essential. The drilled spanner drive system offers superior torque transmission compared to standard slotted designs, reducing installation time while preventing tool slippage in high-torque applications. These fully threaded pan head screws maintain consistent clamping force across their entire length, making them ideal for securing components where uniform pressure distribution is critical to assembly integrity.

Specification Summary & Compliance

This 1/4"-20 UNC rounded head screw features precision Class 2A thread fit with coarse thread spacing, manufactured to exacting dimensional standards. The fastener complies with ASME B18.6.3 specifications for mechanical and dimensional requirements, ensuring interchangeability and reliability in industrial applications. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming the absence of restricted substances for use in regulated industries worldwide. The combination of 80,000 PSI tensile strength and Rockwell B96 hardness provides verified mechanical performance for critical fastening applications.