S-91770A873 5/16"-18 x 3 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 reliable performance under stress
- Enhanced stability and reduced surface pressure thanks to the wide rounded truss head design
- Secure and efficient installation with Phillips No. 4 drive and coarse UNC threads for quick assembly
- Optimized thread engagement through partial threading, minimizing material stress in non-threaded sections
- Precise dimensional accuracy ensured by Class 2A thread fit for consistent mating with nuts and tapped holes
- Full regulatory compliance with ASME B18.6.3, RoHS 3, and REACH standards for safe, quality-assured use
Professional Applications & Engineering Value
This 5/16"-18 UNC coarse thread screw with a rounded truss head and Phillips drive is engineered to address common industrial challenges like vibration loosening and corrosion-induced failure. The passivated 18-8 stainless steel provides excellent resistance to rust and chemicals, making it suitable for outdoor equipment, marine applications, and food processing machinery where moisture exposure is frequent. Its wide truss head distributes clamping force over a larger area, reducing the risk of surface damage on softer materials. The coarse UNC threading ensures rapid installation and reliable holding power in wood, metal, and plastic assemblies, while partial threading prevents thread stripping in critical load zones. These features collectively enhance the fastener's longevity and reliability in heavy-duty industrial and construction settings.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit tolerances and UNC coarse thread standards with a size of 5/16"-18. It is manufactured in compliance with ASME B18.6.3 specifications and is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it meets stringent environmental and safety regulations for industrial use.
