S-94066A846 4-40 x 3/16" Tamper-Resistant Drilled Spanner Stainless Steel Pan Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• High tensile strength of 80,000 psi ensures reliable fastening performance under demanding mechanical loads
• Rockwell B96 hardness provides superior durability and resistance to wear during installation and service life
• Precise Class 2A thread fit guarantees smooth assembly and consistent clamping force in UNC coarse thread applications
• Drilled spanner drive with No. 4 drive size enables secure tool engagement and tamper-resistant installation
• Fully threaded design maximizes grip length and load distribution across the entire 3/16" fastener
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and global market acceptance

Professional Applications & Engineering Value

These 4-40 UNC rounded head pan screws deliver critical performance advantages in precision assembly applications where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel material combined with passivated finish provides exceptional protection against chemical exposure and atmospheric corrosion, making these fasteners ideal for electronic enclosures, medical devices, and marine equipment. The drilled spanner drive offers both tamper-resistant security and positive torque transmission, while the coarse thread spacing ensures rapid installation in various materials. With fully threaded construction and Class 2A thread fit, these screws maintain consistent clamping force in vibration-prone environments, solving common loosening issues in industrial machinery and instrumentation.

Specification Summary & Compliance

This rounded head pan screw features precise UNC thread form with Class 2A thread fit tolerance, ensuring interchangeability and reliable performance. Manufacturing complies with industry standards for dimensional accuracy, including 4-40 thread size, 3/16" length, and coarse thread spacing. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, confirming adherence to environmental regulations for hazardous substances. Mechanical properties include 80,000 psi tensile strength and Rockwell B96 hardness, validating the fastener's suitability for demanding industrial applications.