S-91770A583 5/16"-18 x 1" 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 environments and extended service life
- Enhanced load distribution from the wide rounded truss head design, reducing surface damage and preventing pull-through
- High tensile strength of 70,000 psi ensures reliable performance under heavy-duty mechanical stress
- Easy installation and removal with Phillips No. 4 drive, providing secure tool engagement and reducing cam-out risks
- Precise thread engagement with UNC coarse threads and Class 2A fit, ensuring consistent fastening and vibration resistance
- Full threading along the 1" length offers maximum grip and versatility in various material thicknesses
- Compliance with industry standards including ASME B18.6.3, RoHS 3, and REACH, guaranteeing safety and regulatory adherence
Professional Applications & Engineering Value
This 5/16"-18 x 1" passivated stainless steel rounded truss head screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and high-stress fatigue. The 18-8 stainless steel material combined with a passivated surface treatment provides exceptional resistance to rust and chemicals, making it suitable for outdoor, marine, and chemical processing applications. The rounded truss head offers a larger bearing surface, distributing clamp load effectively to prevent damage to soft materials and maintain joint integrity. With a Rockwell B70 hardness and 70,000 psi tensile strength, it delivers reliable performance in demanding environments like machinery assembly, construction, and automotive systems, where UNC coarse threads ensure quick installation and robust holding power.
Specification Summary & Compliance
This screw features precise Class 2A thread fit and UNC coarse threading with a diameter of 0.313" and length of 1", ensuring dimensional accuracy for consistent fastening. It is manufactured in compliance with ASME B18.6.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substances.
