S-91770A011 4-40 x 5/8" 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 passivated 18-8 stainless steel construction, 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 significant mechanical stress
- Excellent drive stability with Phillips No. 1 drive, minimizing cam-out and enabling efficient installation
- Precise thread engagement with Class 2A UNC coarse threads, providing secure fastening and vibration resistance
- Full threading along the 5/8" length offers maximum grip and adjustability in various material thicknesses
- Compliance with ASME B18.6.3 and environmental regulations guarantees quality and safety for professional use
Professional Applications & Engineering Value
These 4-40 UNC coarse thread rounded truss head screws are engineered to address common industrial challenges such as vibration loosening and corrosion-induced failure. The passivated 18-8 stainless steel material provides exceptional durability, resisting rust and chemical exposure in demanding settings like assembly lines, outdoor equipment, and electronic enclosures. The wide truss head distributes clamping force evenly, preventing surface damage on softer materials while the fully threaded design ensures consistent holding power. With a Rockwell B70 hardness and 70,000 psi tensile strength, these screws maintain integrity under high stress, making them ideal for industrial fastening applications where reliability and regulatory compliance are critical.
Specification Summary & Compliance
These screws feature Class 2A thread fit per UNC standards, ensuring precise dimensional accuracy and interchangeability. Manufacturing adheres to ASME B18.6.3 specifications, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they are free of hazardous substances and suitable for global industrial use.
