S-91266A242 10-24 x 1/2" ASTM F835 Alloy Steel Thread-Locking Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with nylon patch thread locker maintains secure fastening in high-stress environments from -65° to 250°F
• Superior corrosion protection through black-oxide coating on alloy steel extends service life in demanding industrial conditions
• Exceptional mechanical strength with 130,000 psi tensile strength and Rockwell C39 hardness withstands heavy loads and impacts
• Precision thread engagement with Class 3A fit and UNC coarse threads ensures reliable installation and reduced cross-threading risk
• Optimized flush mounting with standard 82° countersink angle and flat head design provides smooth surface finish
• Efficient installation using 1/8" hex drive allows for high-torque application without cam-out issues
• Full regulatory compliance meeting ASTM F835, RoHS 3, and REACH standards ensures environmental and safety requirements

Professional Applications & Engineering Value

These 10-24 UNC flat head screws deliver critical performance advantages for industrial assembly applications where vibration resistance and corrosion protection are paramount. The black-oxide alloy steel construction combined with nylon patch thread locking technology addresses common failure points in machinery, automotive, and electrical enclosures subjected to thermal cycling and dynamic loads. The Class 3A thread fit provides superior engagement precision, reducing installation time while minimizing the risk of stripped threads. With fully threaded design and coarse threading, these fasteners offer rapid assembly in various materials while maintaining the high tensile strength required for structural applications. The combination of hex drive configuration and flat head profile ensures both installation efficiency and flush surface requirements are met in confined spaces.

Specification Summary & Compliance

This fastener features precision 10-24 UNC coarse threads with Class 3A fit for optimal engagement and meets ASTM F835 manufacturing specifications. The black-oxide alloy steel construction delivers consistent performance with Rockwell C39 hardness and 130,000 psi tensile strength. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring suitability for global industrial applications requiring restricted substance compliance.