S-94135A451 1/4"-20 x 1/2" 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 industrial environments
- Enhanced load distribution from the wide truss head design, reducing surface pressure and material damage
- High mechanical strength with 70,000 psi tensile strength and Rockwell B87 hardness for reliable performance under stress
- Secure tamper-resistant fastening using the drilled spanner drive, preventing unauthorized removal
- Precise thread engagement with Class 2A fit and UNC coarse threading, ensuring easy installation and vibration resistance
- Full threading along the 1/2" length provides maximum grip and adjustability in various material thicknesses
- Compliance with industry standards including ASME B18.6.3, RoHS 3, and REACH for guaranteed quality and safety
Professional Applications & Engineering Value
This 1/4"-20 UNC Rounded Truss Head Screw delivers exceptional engineering value in demanding applications where corrosion resistance and structural integrity are critical. The 18-8 Stainless Steel material combats rust and chemical exposure in outdoor, marine, or chemical processing settings, while the wide truss head distributes clamping force over a larger area—preventing damage to soft materials like plastics or composites. The drilled spanner drive offers tamper-resistant security for public infrastructure, machinery guards, or access panels. With coarse UNC threads and Class 2A fit, it ensures quick assembly and maintains hold in vibrating equipment, making it a reliable choice for OEM manufacturing, electrical enclosures, and transportation systems.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with Class 2A dimensional tolerance and coarse spacing for consistent fit. Manufacturing adheres to ASME B18.6.3 specifications, ensuring interchangeability and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of restricted hazardous substances and safe for industrial use.
