S-91770A092 4-40 x 1/4" 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
- Exceptional corrosion resistance from passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments.
- Superior holding power with 70,000 psi tensile strength and Rockwell B70 hardness, providing reliable fastening under mechanical stress.
- Enhanced load distribution through the wide truss head design, reducing surface damage and improving joint integrity.
- Precise thread engagement with Class 2A thread fit and UNC coarse threading, enabling quick installation and vibration resistance.
- Optimized drive efficiency using a No. 1 Phillips drive, facilitating secure tool engagement and reducing cam-out risks.
- Full threading along the 1/4" length for maximum grip and versatility in various material thicknesses.
- Compliance with major industry standards including ASME B18.6.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
These 4-40 UNC rounded truss head Phillips machine screws deliver critical engineering solutions where corrosion resistance and mechanical durability are paramount. The passivated 18-8 stainless steel material effectively combats oxidation and chemical exposure, making them ideal for electronics, machinery, and outdoor equipment. The wide truss head design distributes clamping force over a larger area, preventing surface indentation on softer materials. Combined with coarse UNC threading and Class 2A thread fit, these screws ensure rapid assembly and reliable performance in high-vibration settings, reducing maintenance needs and downtime in industrial operations.
Specification Summary & Compliance
This screw features a 4-40 UNC thread size with Class 2A thread fit and coarse thread spacing, manufactured to ASME B18.6.3 specifications for dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances. The product meets all stated mechanical properties, including tensile strength and hardness, ensuring consistent performance in professional applications.
