S-93310A583 5/16"-18 x 1" 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 from -70° to 250°F
- Superior corrosion resistance thanks to 18-8 stainless steel construction for long-term reliability in harsh environments
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Secure installation through hex drive design that prevents cam-out and ensures precise torque application
- Precision threading with Class 3A UNC coarse threads providing excellent engagement and load distribution
- Regulatory compliance meeting ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications for quality assurance
- Environmental safety with RoHS 3 and REACH compliance for responsible manufacturing standards
Professional Applications & Engineering Value
This nylon patch locking rounded head screw delivers exceptional engineering value in applications where vibration resistance and corrosion protection are critical. The 18-8 stainless steel construction provides inherent resistance to rust and chemical exposure, making it ideal for marine, automotive, and industrial equipment subjected to harsh operating conditions. The permanent nylon patch locking technology eliminates the need for additional locking hardware while maintaining secure fastening across a wide temperature range (-70° to 250°F). The hex drive design ensures reliable installation without stripping, while the Class 3A UNC coarse threads offer superior engagement in various materials. These fully threaded screws with button head profile provide both functional security and aesthetic appeal in visible applications.
Specification Summary & Compliance
This fastener features precision 5/16"-18 UNC coarse threads with Class 3A thread fit for optimal engagement and load distribution. Manufacturing complies with ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, ensuring consistent quality and performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental and safety regulations for industrial components.
