S-91770A868 1/4"-20 x 4 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
- Exceptional load-bearing capacity with 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
- Enhanced stability and reduced surface pressure thanks to the wide truss head design
- Reliable fastening in various materials with UNC coarse threading and Class 2A thread fit
- Efficient installation using standard Phillips No. 3 drive tools
- Optimized thread engagement with partial threading for precise clamping control
- Compliance with rigorous standards including ASME B18.6.3, RoHS 3, and REACH
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these rounded truss head screws deliver exceptional performance where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides lasting protection against rust and chemical exposure, making them ideal for outdoor equipment, marine applications, and food processing machinery. The wide truss head distributes clamping force over a larger surface area, preventing material damage and maintaining seal integrity in assembled components. With UNC coarse threads and partial threading, these screws offer superior pull-out resistance in soft materials and allow for precise tension control in critical assemblies. The combination of 70,000 psi tensile strength and standardized Phillips drive ensures reliable fastening in high-vibration applications while facilitating efficient installation across manufacturing and maintenance operations.
Specification Summary & Compliance
These 1/4"-20 UNC screws maintain Class 2A thread fit tolerances with coarse thread spacing and partial threading up to 1½". Manufactured in compliance with ASME B18.6.3 specifications, they meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The dimensional configuration includes a 0.573" head diameter with 4½" overall length, ensuring interchangeability and reliable performance in standardized applications.
