S-91266A198 8-32 x 3/4" ASTM F835 Alloy Steel Thread-Locking Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with integrated Nylon Patch thread locker, eliminating the need for separate locking washers or adhesives
• Superior corrosion protection from the Black-Oxide finish, extending service life in demanding industrial environments
• Exceptional mechanical strength with 130,000 psi tensile strength and Rockwell C39 hardness for high-stress applications
• Reliable performance across extreme temperatures, operating from -65° to 250°F without compromising locking integrity
• Precise, secure fastening with Class 3A thread fit and UNC coarse threads for quick assembly and reduced cross-threading risk
• Streamlined installation with standard 82° flat head and hex drive, allowing for flush mounting and easy torque application
• Full-thread engagement along the 3/4" length, maximizing grip and load distribution in assembled components

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Flat Head Screw is engineered to solve critical challenges in industrial assembly where vibration loosening and material failure are primary concerns. The permanent Nylon Patch thread locker provides consistent locking force without degrading, making it ideal for machinery, automotive subsystems, and electronic enclosures subjected to constant motion. Its high tensile strength and temperature resistance ensure reliability in environments ranging from freezing outdoor equipment to heated engine compartments. The UNC coarse thread and Class 3A fit enable rapid installation with standard hex tools, reducing assembly time while maintaining precision. The flat head design offers a clean, flush finish for applications where protruding fasteners are not feasible, enhancing both safety and aesthetics.

Specification Summary & Compliance

This screw features a Class 3A thread fit for superior dimensional accuracy and a UNC coarse thread pattern (8-32) with full threading. Manufacturing and performance comply with ASTM F835 specifications, ensuring consistent quality and mechanical properties. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for global industrial use.