S-94063A192 8-32 x 3/8" ASME B18.6.3 Tamper-Resistant Drilled Spanner Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish for extended service life in harsh environments
• High tensile strength of 70,000 psi ensures reliable fastening performance under substantial mechanical loads
• Precise Class 2A thread fit provides smooth installation and consistent clamping force in UNC coarse thread applications
• Drilled spanner drive design enables secure tool engagement and prevents stripping during high-torque assembly
• 82° countersink angle allows flush mounting for streamlined surfaces and improved aerodynamics
• Full threading along 3/8" length offers maximum grip range and adjustment flexibility in various material thicknesses
• Rockwell B70 hardness maintains thread integrity and drive features through repeated installation cycles

Professional Applications & Engineering Value

These 8-32 UNC flat head screws deliver critical engineering solutions where flush surface mounting and corrosion resistance are paramount. The combination of 18-8 stainless steel construction and passivated surface treatment creates a protective oxide layer that significantly outperforms standard finishes in moist, chemical, or outdoor environments. The drilled spanner drive addresses common installation challenges in confined spaces where socket heads are impractical, while the coarse UNC threading provides rapid assembly in softer materials and plastics. Engineers specify these fasteners for machinery panels, electronic enclosures, and transportation equipment where vibration resistance, aesthetic requirements, and regulatory compliance must be balanced without compromising structural integrity.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with Class 2A thread tolerances ensuring interchangeability and proper fit. The 82° flat head profile and 0.312" head diameter maintain standard countersink dimensions. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for hazardous substance restrictions. Threading conforms to UNC 8-32 coarse pitch standards with right-hand direction and full thread engagement across the 3/8" length.