S-90276A113 4-40 x 3/4" ASME B18.6.3 Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in harsh environments
• High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
• Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
• Class 2A thread fit with UNC coarse threading enables quick assembly and secure fastening in various materials
• Fully threaded design offers maximum grip and holding power along the entire 3/4" length
• Slotted rounded head allows for easy installation with standard screwdrivers while providing a low-profile finish
• Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH ensures quality and environmental responsibility

Professional Applications & Engineering Value

These 4-40 UNC zinc-plated steel rounded head slotted screws deliver exceptional engineering value across industrial applications where reliability and corrosion resistance are paramount. The combination of 60,000 psi tensile strength and Rockwell B69 hardness makes them ideal for demanding environments including machinery assembly, electronic enclosures, and automotive components. The zinc plating provides critical protection against oxidation and chemical exposure, while the coarse UNC threading ensures secure fastening in both metal and plastic substrates. The slotted drive rounded head design facilitates quick installation and removal while maintaining a clean, professional appearance. These fully threaded screws are engineered to withstand vibration and mechanical stress, making them perfect for applications requiring repeated maintenance access without compromising fastener integrity.

Specification Summary & Compliance

These industrial-grade rounded head screws feature precise Class 2A thread fit with 4-40 UNC coarse threading and right-hand thread direction, manufactured to exacting dimensional standards. The 3/4" length and fully threaded construction ensure consistent performance across applications. Compliance includes ASME B18.6.3 specifications for dimensional accuracy and mechanical properties, along with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming they are free from restricted hazardous substances and suitable for global industrial use.