S-91700A252 4-40 x 1/4" 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 industrial environments
• Exceptional mechanical strength with 50,000 psi tensile strength and Rockwell B50 hardness for demanding fastening applications
• Precision thread engagement with Class 2A thread fit and UNC coarse threads providing secure, vibration-resistant connections
• Optimized countersinking performance featuring 82° countersink angle and standard oval head profile for flush, professional installations
• Full threading capability along the entire 1/4" length enables maximum grip strength and versatile positioning options
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Easy manual installation with traditional slotted drive design for straightforward assembly and maintenance operations

Professional Applications & Engineering Value

These 4-40 UNC brass oval head slotted screws deliver critical engineering advantages where corrosion resistance and precision fastening are paramount. The combination of brass material properties and Class 2A thread fit addresses common industrial challenges including galvanic corrosion in electrical components, marine environments, and plumbing systems. The fully threaded design ensures maximum engagement in thin materials and tight spaces, while the 82° countersink angle provides secure, flush mounting in precision machinery, electronic enclosures, and instrumentation panels. These flat head screws maintain structural integrity under vibration and thermal cycling, making them ideal for industrial fasteners in manufacturing equipment, automotive assemblies, and telecommunications infrastructure where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to exact ASME B18.6.3 specifications with precision Class 2A thread fit and UNC coarse thread profile (4-40 size). Features include right-hand threading, 0.112" thread diameter, and 1/4" fully threaded length. Compliant with RoHS 3 (2015/863/EU) under exemption 6(a)-I for lead as an alloying element and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance for industrial applications.