S-92360A315 4-40 x 3/4" MIL-DTL-18240 Thread-Locking Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance through Nylon patch locking technology that maintains secure fastening under extreme conditions
• Exceptional durability with 120,000 PSI tensile strength and Rockwell C37 hardness for heavy-duty industrial applications
• Reliable performance across wide temperature ranges from -70°F to 250°F without compromising locking effectiveness
• Superior corrosion protection provided by black-oxide coating on alloy steel for extended service life
• Precise installation and removal with 1/16" hex drive and Class 3A thread fit ensuring accurate torque application
• Full-thread engagement capability along the entire 3/4" length for maximum holding power in various material thicknesses
• Compliance with military and environmental standards including MIL-DTL-18240, RoHS 3, and REACH for quality assurance

Professional Applications & Engineering Value

This 4-40 UNC coarse thread screw with Nylon patch locking addresses critical vibration-induced loosening in demanding industrial environments. The black-oxide alloy steel construction provides excellent corrosion resistance while maintaining high tensile strength for structural integrity. The rounded button head design offers a low-profile finish that minimizes snagging in tight spaces, while the fully threaded configuration ensures consistent clamping force across various material thicknesses. Particularly valuable in aerospace, automotive, and heavy machinery applications, this fastener maintains reliable performance through thermal cycling and mechanical stress, reducing maintenance frequency and preventing costly assembly failures. The coarse UNC threading enables quick installation in softer materials while the Class 3A thread fit guarantees precise engagement for critical alignment requirements.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit tolerances with 4-40 UNC coarse threading and right-hand thread direction. This fully threaded fastener meets MIL-DTL-18240 military specifications and demonstrates compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The black-oxide surface treatment on alloy steel provides consistent corrosion protection while maintaining the material's inherent 120,000 PSI tensile strength and Rockwell C37 hardness properties.