S-91792A108 4-40 x 3/8" ASME B18.6.3 Stainless Steel Pan Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength offering 100,000 psi tensile strength and Rockwell B100 hardness for demanding applications
• Precision thread engagement with Class 2A UNC coarse threads providing reliable fastening and easy installation
• Optimized drive performance through slotted drive design and rounded pan head profile for secure tool engagement
• Full-threaded design maximizing grip strength and load distribution across the entire 3/8" length
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

These 4-40 UNC rounded pan head slotted screws deliver critical performance advantages in precision assembly applications where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 Stainless Steel material with passivated finish provides exceptional protection against oxidation and chemical exposure, making them ideal for electronics enclosures, medical devices, and marine equipment. The coarse thread design ensures rapid installation and secure fastening in various materials, while the slotted drive system offers compatibility with standard tools for maintenance and field service. With full threading along the entire 3/8" length, these fasteners distribute clamping forces evenly, preventing stress concentration and maintaining joint integrity in vibration-prone environments.

Specification Summary & Compliance

This precision fastener features Class 2A thread fit tolerances per UNC standards, ensuring consistent engagement and reliable performance. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming the absence of restricted substances. The right-hand thread direction and coarse thread spacing provide optimal fastening characteristics for industrial applications requiring repeated assembly and disassembly.