S-94779A303 4-40 x 1/4" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws
Stainless Steel Truss Head Phillips 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
- Superior corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments
- Enhanced load distribution from the wide truss head design, reducing surface damage and improving joint integrity
- High tensile strength of 70,000 psi ensures reliable performance under mechanical stress and vibration
- Precision Class 2A thread fit for smooth installation and consistent engagement in UNC coarse threaded applications
- Rockwell B70 hardness provides excellent wear resistance and maintains thread integrity through repeated use
- Full threading allows maximum adjustability and secure fastening across the entire screw length
- Phillips drive compatibility enables efficient installation with standard industrial tools
Professional Applications & Engineering Value
These 4-40 UNC rounded truss head machine screws deliver exceptional engineering value across industrial applications where corrosion resistance and mechanical reliability are paramount. The Black-Oxide 18-8 Stainless Steel construction provides superior protection against oxidation and chemical exposure, making them ideal for electronics enclosures, machinery assemblies, and outdoor equipment. The combination of coarse UNC threading and Class 2A fit ensures rapid installation with reduced cross-threading risks, while the wide truss head design distributes clamping force effectively across softer materials. With 70,000 psi tensile strength and full threading, these screws maintain joint integrity in high-vibration environments, solving common fastening challenges in manufacturing, automotive, and electrical industries.
Specification Summary & Compliance
This machine screw features precision 4-40 UNC coarse threads with Class 2A tolerance for consistent fit and performance. Manufactured to ASME B18.6.3 specifications, ensuring dimensional accuracy and interchangeability. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting environmental and safety standards for industrial use worldwide.
