S-94779A309 4-40 x 1/2" 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 environments and reducing replacement frequency.
- High tensile strength of 70,000 psi ensures reliable load-bearing capacity and joint integrity in demanding applications.
- Wide truss head design provides enhanced load distribution and minimizes surface damage during installation.
- Coarse UNC threading offers quick assembly and reduced cross-threading risks, improving installation efficiency.
- Class 2A thread fit guarantees consistent, reliable engagement with standard nuts and tapped holes.
- Full threading along the 1/2" length allows for maximum adjustability and secure fastening at any point.
- Compliance with ASME B18.6.3, RoHS 3, and REACH ensures adherence to industry standards and environmental safety regulations.
Professional Applications & Engineering Value
Engineered for industrial and commercial assemblies, these 4-40 UNC coarse thread screws with a rounded truss head address common challenges like vibration loosening and material fatigue. The Black-Oxide 18-8 Stainless Steel construction provides excellent corrosion resistance, making them suitable for outdoor equipment, electrical enclosures, and machinery exposed to moisture or chemicals. The wide truss head distributes clamping force effectively, reducing the risk of surface damage on softer materials. With a Phillips drive and coarse threading, installation is swift and secure, minimizing assembly time while maintaining high tensile strength for long-term reliability in structural and mechanical fastening.
Specification Summary & Compliance
This screw features a Class 2A thread fit per UNC standards, ensuring precise dimensional accuracy and compatibility. It is manufactured in accordance with ASME B18.6.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental adherence for global industrial use.
