S-90517A413 10-32 x 3/4" ASME B18.3 Tamper-Resistant Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• Enhanced security and tamper resistance with a tamper-resistant hex drive, deterring unauthorized access in public or high-security installations.
• Precise thread engagement and vibration resistance from Class 3A thread fit and fine UNF threading, reducing the risk of loosening under dynamic loads.
• High mechanical strength and durability with 70,000 psi tensile strength and Rockwell B55 hardness, suitable for demanding industrial applications.
• Flush mounting and streamlined appearance with a standard flat head profile and 82° countersink angle, ideal for surfaces requiring a smooth finish.
• Full-length threading for maximum grip across the entire 3/4" length, providing consistent holding power in various material thicknesses.
• Compliance with industry standards including ASME B18.3, ensuring consistent quality and interchangeability in professional assemblies.

Professional Applications & Engineering Value

This 10-32 UNF flat head screw is engineered to address critical challenges in industrial and security-focused environments. The 18-8 stainless steel material, combined with a passivated finish, offers exceptional resistance to corrosion and oxidation, making it ideal for outdoor equipment, marine hardware, and chemical processing facilities where moisture and corrosive agents are prevalent. The tamper-resistant hex drive adds a layer of security, preventing unauthorized removal in public infrastructure, electrical enclosures, and machinery access panels. With a Class 3A thread fit and fine thread spacing, it ensures tight, reliable fastening in applications subject to vibration, such as automotive assemblies or precision instruments. The flat head design allows for seamless integration into countersunk holes, maintaining aerodynamic or aesthetic surfaces in consumer electronics, aerospace components, and architectural fixtures.

Specification Summary & Compliance

This screw features a 10-32 UNF thread size with Class 3A thread fit for high precision and tight tolerances. It is fully threaded with a length of 3/4", head diameter of 0.411", and drive size of 5/32". Manufacturing and dimensional compliance adhere to ASME B18.3 specifications. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for hazardous substance restrictions.