S-91770A179 4-40 x 1 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 passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Enhanced load distribution from the wide rounded truss head design, reducing surface damage and improving joint integrity
- High tensile strength of 70,000 psi ensures reliable performance under heavy mechanical stress
- Excellent thread engagement with fully threaded coarse UNC spacing and Class 2A fit for quick, secure installations
- Optimized drive efficiency using Phillips No. 1 drive, minimizing cam-out and speeding up assembly processes
- Consistent hardness (Rockwell B70) provides long-term durability and resistance to wear in repetitive applications
- Broad compatibility with standard UNC 4-40 components, reducing inventory complexity and replacement costs
Professional Applications & Engineering Value
These 4-40 UNC rounded truss head screws deliver exceptional engineering value in demanding applications such as machinery assembly, electronic enclosures, and structural frameworks. The passivated 18-8 stainless steel offers reliable corrosion resistance, critical for operations exposed to moisture, chemicals, or outdoor elements. The wide truss head profile distributes clamping force evenly, preventing surface damage on softer materials and maintaining seal integrity. With coarse thread spacing and full threading, these screws provide rapid installation and high pull-out strength, reducing assembly time and minimizing the risk of thread stripping. The Phillips drive ensures compatibility with common tools, enhancing workflow efficiency in maintenance and production lines where speed and reliability are paramount.
Specification Summary & Compliance
This screw features precise Class 2A thread fit and UNC 4-40 coarse thread specifications, ensuring consistent performance and interchangeability. Manufacturing adheres to ASME B18.6.3 standards for dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting sustainable procurement practices in industrial supply chains.
