S-91770A319 4-40 x 1/8" 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 clamping force
- High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under stress
- Precise thread engagement with Class 2A fit and UNC coarse threads, ensuring consistent fastening and easy installation
- Optimized drive efficiency using Phillips No. 1 drive, providing secure torque transfer and reduced cam-out risk
- Full-threaded design for maximum grip along the entire 1/8" length, enhancing connection integrity in tight spaces
- Compliance with industry standards including ASME B18.6.3, RoHS 3, and REACH, ensuring safety and environmental responsibility
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 4-40 UNC machine screws deliver exceptional reliability in electronics, machinery assembly, and precision equipment. The passivated 18-8 stainless steel provides excellent corrosion resistance, critical for environments exposed to moisture or chemicals, while the wide truss head distributes clamping force evenly to prevent surface damage on delicate components. With a coarse thread spacing and Class 2A thread fit, installation is swift and secure, reducing assembly time and minimizing cross-threading risks. The fully threaded design ensures consistent holding power across the entire length, making these Phillips drive screws ideal for applications where vibration resistance and long-term durability are paramount.
Specification Summary & Compliance
This fastener maintains precise Class 2A thread fit per UNC standards with coarse thread spacing, ensuring dimensional accuracy and reliable performance. Manufactured in compliance with ASME B18.6.3 specifications, it meets rigorous mechanical and dimensional requirements. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material integrity for global industrial use.
