S-91700A254 4-40 x 3/8" ASME B18.6.3 Brass Slotted Oval Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from high-quality brass construction, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength with 50,000 psi tensile strength and Rockwell B50 hardness for demanding applications
• Precision thread engagement with Class 2A UNC coarse threads providing secure, vibration-resistant fastening
• Optimal countersinking performance featuring 82° countersink angle for flush mounting and clean aesthetic finish
• Full threading capability along the entire 3/8" length for maximum grip and load distribution
• Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and performance
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe, sustainable usage

Professional Applications & Engineering Value

These 4-40 UNC brass oval head slotted screws deliver exceptional engineering value across multiple industrial sectors. The brass material provides inherent corrosion resistance, making these fasteners ideal for electrical components, marine equipment, and plumbing systems where moisture exposure is common. The oval head design with standard profile combines aesthetic appeal with functional performance, while the slotted drive style offers compatibility with standard installation tools. The coarse thread configuration ensures quick assembly and disassembly in applications requiring frequent maintenance. With fully threaded construction and Class 2A thread fit, these screws maintain consistent clamping force in vibration-prone environments, preventing loosening in automotive, aerospace, and precision instrument assemblies. The combination of 50,000 psi tensile strength and Rockwell B50 hardness ensures reliable performance in mechanical fastening applications where both strength and corrosion resistance are critical requirements.

Specification Summary & Compliance

This 4-40 UNC brass oval head slotted screw maintains precise dimensional accuracy with Class 2A thread fit per UNC standards and 82° countersink angle for proper seating. Manufacturing strictly adheres to ASME B18.6.3 specifications for dimensional consistency and performance reliability. Regulatory 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, ensuring environmental safety and material traceability. The inch system measurement guarantees compatibility with North American industrial standards and replacement part requirements.