S-91266A652 3/8"-24 x 1" ASTM F835 Alloy Steel Thread-Locking Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch thread locker prevents loosening in high-stress environments
• Exceptional tensile strength of 130,000 PSI ensures reliable performance under heavy loads and extreme conditions
• Precision Class 3A fine threading provides superior fit and engagement for critical assembly applications
• Temperature-resistant construction maintains locking integrity across a wide range from -65° to 250°F
• Corrosion-resistant black-oxide finish on alloy steel extends service life in demanding industrial environments
• 82° countersink angle design allows for flush mounting and clean aesthetic finish in precision applications
• Hex drive compatibility with 7/32" drive size enables secure installation and high torque application

Professional Applications & Engineering Value

These 3/8"-24 UNF flat head screws with nylon patch locking technology solve critical vibration-induced loosening problems in industrial machinery, automotive assemblies, and heavy equipment. The black-oxide alloy steel construction combined with Class 3A fine threading ensures precise fitment and reliable performance in applications requiring repeated disassembly and reassembly. The 82° countersink angle provides optimal flush mounting for aerodynamic surfaces and precision enclosures, while the temperature-resistant thread locker maintains secure fastening across extreme thermal cycling conditions common in manufacturing and transportation equipment.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit standards with UNF fine threading (3/8"-24) and fully threaded design. Complies with ASTM F835 specifications for mechanical properties and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features Rockwell C39 hardness and maintains dimensional accuracy per industrial fastening requirements.