S-91700A251 4-40 x 3/16" ASME B18.6.3 Brass Slotted Oval Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from high-quality brass construction, ideal for harsh industrial environments
• Enhanced mechanical strength with 50,000 psi tensile strength and Rockwell B50 hardness for reliable load-bearing performance
• Precise thread engagement with Class 2A thread fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Flush mounting capability featuring undercut oval head with 82° countersink angle for smooth, professional surface finishes
• Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Easy installation and removal with traditional slotted drive design compatible with standard screwdrivers

Professional Applications & Engineering Value

These 4-40 UNC brass oval head slotted screws deliver exceptional value in applications requiring both aesthetic appeal and mechanical reliability. The brass material provides natural corrosion resistance, making these flat head screws ideal for electrical components, marine equipment, and plumbing systems where moisture exposure is common. The undercut oval head design with 82° countersink angle ensures flush mounting without protrusion, preventing snagging while maintaining clean lines in finished products. The Class 2A thread fit and coarse thread spacing provide excellent engagement in various materials while resisting loosening from vibration. These fully threaded industrial screws distribute clamping force evenly, reducing stress concentration points that can lead to material failure in precision assemblies and electronic enclosures.

Specification Summary & Compliance

These screws feature precise Class 2A thread fit per UNC standards with coarse thread spacing for optimal performance. Manufacturing complies with ASME B18.6.3 specifications ensuring dimensional accuracy and interchangeability. Environmental compliance includes RoHS 3 (2015/863/EU) with exemption 6(a)-I for lead as an alloying element and full REACH (EC 1907/2006) compliance as of June 14, 2023. The combination of right-hand threads, fully threaded design, and standardized dimensions guarantees reliable performance in industrial fastening applications.