S-93310A722 4-40 x 3/4" MIL-DTL-18240 Thread-Locking Stainless Steel Button Head Hex-Drive Screws
Thread-Locking Stainless Steel Button Head Hex-Drive Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Vibration-resistant locking with permanent nylon patch thread locker that maintains secure fastening in temperatures from -70° to 250°F
- Superior corrosion resistance through 18-8 stainless steel construction for extended service life in harsh environments
- Precise thread engagement with Class 3A thread fit ensuring reliable assembly and reduced cross-threading risks
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Easy installation and removal with hex drive design providing positive tool engagement and torque transmission
- Optimized thread design with coarse UNC spacing offering faster assembly and improved resistance to loosening
- Regulatory compliance meeting MIL-DTL-18240 specifications and RoHS 3 requirements for quality assurance
Professional Applications & Engineering Value
These 4-40 UNC thread rounded head screws with nylon patch thread locker provide critical vibration resistance in industrial assemblies where loosening under dynamic loads is a common failure point. The 18-8 stainless steel construction offers excellent corrosion resistance for harsh environments including marine, chemical processing, and outdoor equipment. With Class 3A thread fit precision and coarse thread spacing, these fasteners enable rapid assembly while maintaining secure connections in high-vibration applications such as machinery, electronic enclosures, and automotive components. The combination of 70,000 psi tensile strength and temperature-stable locking from -70° to 250°F ensures reliable performance across diverse operating conditions.
Specification Summary & Compliance
This rounded head screw features precise Class 3A thread fit with 4-40 UNC coarse thread spacing and right-hand threading. Manufacturing complies with MIL-DTL-18240 specifications, ensuring consistent quality and performance. The product is fully RoHS 3 (2015/863/EU) compliant and meets REACH (EC 1907/2006) requirements for environmental safety standards.
