S-91793A105 4-40 x 3/16" ASME B18.6.3 Stainless Steel Binding 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 industrial environments.
• Exceptional mechanical strength offering 100,000 psi tensile strength and Rockwell B100 hardness for secure, vibration-resistant fastening in demanding applications.
• Easy installation and removal thanks to the slotted drive style and fully threaded UNC coarse thread design, reducing assembly time and labor costs.
• Wide, rounded binding head provides a larger bearing surface to prevent damage to soft materials and improve component stability.
• Precise thread fit (Class 2A) ensures consistent engagement and reliable performance in right-hand threaded assemblies.
• Compliance with industry standards including ASME B18.6.3, guaranteeing dimensional accuracy and interchangeability across industrial systems.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for sustainable procurement.

Professional Applications & Engineering Value

These 4-40 UNC binding head screws are engineered to address common industrial fastening challenges, such as material degradation and assembly inefficiency. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to oxidation and chemical exposure, making them ideal for electronics, machinery, and outdoor equipment where moisture or contaminants are present. The rounded head design and coarse thread facilitate quick installation with standard slotted drivers, reducing the risk of stripping and ensuring a tight fit in plastics, sheet metal, and composite materials. By offering 100,000 psi tensile strength and full threading, these screws deliver uniform clamping force and vibration resistance, minimizing maintenance needs in automated systems and precision instruments.

Specification Summary & Compliance

This product features a 4-40 UNC coarse thread with Class 2A fit for precise dimensional tolerance, ensuring reliable thread engagement. Manufacturing adheres to ASME B18.6.3 specifications, and the screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable and safe industrial use.