S-94135A581 5/16"-18 x 3/4" ASME B18.6.3 Tamper-Resistant Drilled Spanner Stainless Steel Truss Head Screws
Tamper-Resistant Drilled Spanner Stainless Steel Truss Head 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 18-8 Stainless Steel construction, ideal for harsh environments and long-term reliability.
- Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B87 hardness for demanding applications.
- Enhanced load distribution from the wide truss head design, reducing surface pressure and preventing material damage.
- Secure and tamper-resistant fastening with a drilled spanner drive, providing a positive grip during installation.
- Reliable and quick assembly due to coarse UNC threading and Class 2A fit, ensuring consistent engagement and vibration resistance.
- Full thread coverage along the 3/4" length for maximum grip and holding power in various material thicknesses.
- Compliance with major industry standards including ASME B18.6.3, RoHS 3, and REACH, guaranteeing safety and regulatory adherence.
Professional Applications & Engineering Value
This 5/16"-18 UNC Rounded Truss Head Screw is engineered to address common industrial challenges such as vibration loosening, corrosion in aggressive atmospheres, and the need for reliable, high-strength fastening. The 18-8 Stainless Steel material provides excellent resistance to rust and chemical exposure, making it suitable for outdoor, marine, and chemical processing equipment. The wide truss head offers a larger bearing surface, distributing clamp load effectively to prevent sheet metal distortion or plastic part cracking. Combined with coarse thread spacing and a drilled spanner drive, it ensures rapid installation and secure performance in assemblies requiring frequent maintenance or high torque. Ideal for machinery, enclosures, and structural frameworks, this fastener enhances assembly integrity and reduces long-term maintenance costs.
Specification Summary & Compliance
This screw features a 5/16"-18 UNC thread with Class 2A dimensional tolerance for consistent fit and performance. It is fully threaded and manufactured in compliance with ASME B18.6.3 specifications. The product is also certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for hazardous substances.
