S-93310A580 5/16"-18 x 5/8" ASME B18.3, ASTM F879, 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
- Permanent vibration resistance with Nylon Patch locking that maintains secure fastening in high-stress environments
- Superior corrosion resistance thanks to 18-8 Stainless Steel construction for long-term durability in harsh conditions
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Wide temperature tolerance from -70° to 250°F ensures reliable operation across extreme thermal cycles
- Precision thread engagement with Class 3A fit and UNC coarse threading for quick assembly and reduced cross-threading risk
- Easy installation with 3/16" hex drive providing positive torque transmission and reduced tool slippage
- Full thread coverage along the entire 5/8" length for maximum grip and load distribution
Professional Applications & Engineering Value
These 18-8 Stainless Steel rounded head screws with Nylon Patch locking technology deliver critical vibration resistance in industrial machinery, automotive assemblies, and electronic enclosures where loosening under dynamic loads poses safety risks. The coarse UNC threading and Class 3A thread fit ensure rapid installation while maintaining precision alignment, significantly reducing assembly time in high-volume production environments. The combination of 70,000 psi tensile strength and corrosion-resistant stainless steel makes these button head screws ideal for applications exposed to moisture, chemicals, or outdoor elements where both mechanical integrity and long-term reliability are paramount. The rounded head profile provides a finished appearance while eliminating sharp edges in accessible areas.
Specification Summary & Compliance
Manufactured to ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications with Class 3A thread fit for precision dimensional accuracy. Features 5/16"-18 UNC coarse threads and full threading along the 5/8" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for global manufacturing applications.
