S-91770A113 4-40 x 3/4" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws
Stainless Steel Truss Head Phillips Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
- Enhanced load distribution from the wide truss head design, reducing surface pressure and preventing material damage.
- High tensile strength of 70,000 psi ensures dependable performance under significant mechanical stress.
- Excellent drive engagement with Phillips No. 1 drive, providing secure torque application and reducing cam-out risks.
- Precise thread fit (Class 2A) for smooth assembly and consistent clamping force in coarse UNC threading applications.
- Full threading along the 3/4" length allows for maximum adjustability and strong holding power across the entire fastener.
- Compliance with major industry standards including ASME B18.6.3, ensuring quality and interoperability in professional assemblies.
Professional Applications & Engineering Value
This 4-40 UNC rounded truss head screw is engineered to address common industrial challenges such as vibration loosening and corrosion-induced failure. The passivated 18-8 stainless steel offers exceptional resistance to oxidation and chemicals, making it suitable for electronics, machinery, and outdoor equipment where environmental factors are a concern. The wide truss head provides a larger bearing surface, distributing clamp load effectively to prevent damage to softer materials. Combined with a coarse thread and Phillips drive, it ensures quick installation and reliable performance in high-stress applications, reducing maintenance needs and improving assembly lifespan.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. It meets ASME B18.6.3 specifications for mechanical and dimensional requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for various industrial and consumer applications.
