S-91266A240 10-24 x 3/8" ASTM F835 Alloy Steel Thread-Locking Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant secure fastening with nylon patch thread locker that maintains integrity from -65° to 250°F
• Exceptional tensile strength of 130,000 psi for heavy-duty applications requiring reliable load-bearing capability
• Superior corrosion protection through black-oxide coating on alloy steel, extending service life in demanding environments
• Precise Class 3A thread fit ensuring consistent engagement and reduced risk of cross-threading during installation
• Optimized drive efficiency with 1/8" hex drive providing positive torque transmission and reduced tool slippage
• Enhanced material durability with Rockwell C39 hardness offering excellent resistance to wear and deformation
• Universal compatibility with UNC coarse threading and standard 82° countersink angle for seamless integration

Professional Applications & Engineering Value

These black-oxide alloy steel flat head screws deliver critical performance advantages in industrial settings where vibration loosening compromises assembly integrity. The nylon patch thread locking mechanism creates permanent friction resistance without requiring separate locking components, solving maintenance-intensive fastening problems in machinery, automotive, and electrical enclosures. Engineered with Class 3A UNC coarse threads, they provide rapid installation in sheet metal, plastic components, and structural frameworks while maintaining 130,000 psi tensile strength under dynamic loads. The 82° flat head profile ensures flush mounting in countersunk applications, making them ideal for aerospace fixtures, production equipment, and transportation systems where surface clearance and vibration resistance are paramount.

Specification Summary & Compliance

Manufactured to ASTM F835 specifications with precision Class 3A thread fit and UNC coarse threading (10-24). Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The black-oxide alloy steel construction delivers consistent performance across the specified temperature range of -65° to 250°F while maintaining Rockwell C39 hardness and mechanical properties.