S-91266A246 10-24 x 3/4" ASTM F835 Alloy Steel Thread-Locking Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent Nylon Patch ensures secure fastening in high-stress environments, preventing loosening under dynamic loads.
• Exceptional tensile strength of 130,000 psi provides reliable performance in demanding industrial applications, reducing the risk of fastener failure.
• Corrosion-resistant black-oxide finish on alloy steel enhances durability and extends service life in various operating conditions.
• Precise Class 3A thread fit with UNC coarse threading ensures easy installation and superior engagement in tapped holes.
• Wide temperature tolerance from -65° to 250°F maintains locking integrity and mechanical properties in extreme environments.
• Flat head design with standard 82° countersink allows for flush mounting, improving aesthetics and safety in assembled products.
• 1/8" hex drive facilitates efficient installation and removal with standard tools, speeding up assembly processes.

Professional Applications & Engineering Value

These black-oxide alloy steel flat head screws are engineered to address critical challenges in industrial fastening, particularly where vibration-induced loosening compromises assembly integrity. The permanent Nylon Patch locking technology creates a reliable barrier against rotational forces, making them ideal for machinery, automotive components, and electronic enclosures subject to constant motion. The fully threaded UNC coarse design ensures maximum grip in materials prone to stripping, while the high tensile strength and Rockwell C39 hardness provide durability under heavy loads. Their flush-mounted head profile eliminates protrusions in tight spaces, enhancing both safety and design flexibility. These screws deliver consistent performance in applications ranging from manufacturing equipment to aerospace assemblies, where failure is not an option.

Specification Summary & Compliance

This product features precision UNC Class 3A threads with coarse spacing, ensuring tight tolerances for reliable fit. Manufacturing adheres to ASTM F835 specifications, guaranteeing consistent quality and performance. The screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming their suitability for environmentally conscious industrial applications. Dimensions include a 10-24 thread size, 3/4" length, and 0.411" head diameter with an 82° countersink angle for standard flush installation.