S-93705A119 4-40 x 5/16" ASME B18.3 18-8 Stainless Steel Thread-Locking Socket Head Screws
18-8 Stainless Steel Thread-Locking Socket Head 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
- Permanent vibration resistance with nylon patch thread locker that maintains secure locking from -70° to 250°F
- Superior corrosion resistance through 18-8 stainless steel construction for harsh industrial environments
- High-strength performance with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Precise thread engagement with Class 3A fit UNC coarse threads ensuring reliable fastening in various materials
- Easy installation and removal using standard 3/32" hex drive for efficient maintenance operations
- Full thread coverage along the entire 5/16" length for maximum grip and load distribution
- Regulatory compliance assurance meeting ASME B18.3 standards with RoHS 3 and REACH environmental directives
Professional Applications & Engineering Value
These 4-40 UNC socket head cap screws with nylon patch thread locking technology provide critical vibration resistance in industrial machinery, electronic enclosures, and precision equipment where loosening under dynamic loads poses significant reliability concerns. The 18-8 stainless steel construction delivers exceptional corrosion resistance in challenging environments while maintaining 70,000 psi tensile strength for structural integrity. The coarse UNC threads with Class 3A fit ensure rapid installation and secure fastening in various substrate materials, reducing assembly time while preventing back-out in high-vibration applications. The temperature-resistant nylon patch maintains locking capability across extreme thermal cycles from -70° to 250°F, making these fasteners ideal for automotive, aerospace, and industrial equipment subjected to thermal expansion and contraction.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision dimensional accuracy. Features 4-40 UNC coarse threads with right-hand direction and fully threaded 5/16" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global industrial applications. The standard socket head profile with 3/32" hex drive provides consistent tool engagement across installations.
