S-90273A435 5/16"-18 x 3 1/2" ASME B18.6.3 Steel Phillips Flat Head Screws
Steel Phillips Flat 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
- Enhanced corrosion resistance with zinc-plated steel construction for reliable performance in demanding industrial environments
- Superior holding power with 60,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
- Optimized flush installation featuring standard 82° countersink angle and flat head design for smooth surface finishing
- Efficient coarse threading with UNC 5/16"-18 pattern ensuring quick assembly and strong grip in various materials
- Secure Phillips drive engagement with No. 4 drive size providing reliable torque transfer during installation
- Precision manufacturing with Class 2A thread fit guaranteeing consistent performance and interchangeability
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These zinc-plated steel flat head screws deliver exceptional engineering value across industrial applications where flush surface mounting and high tensile strength are critical. The UNC coarse threading provides superior pull-out resistance in wood, metal, and composite materials, while the partial threading design concentrates engagement strength where needed most. The 82° countersink angle ensures secure seating in standard chamfered holes, preventing screw head protrusion in machinery, equipment assembly, and structural applications. The combination of 60,000 psi tensile strength and Rockwell B70 hardness makes these Phillips drive screws ideal for applications requiring repeated disassembly and reassembly without thread degradation.
Specification Summary & Compliance
Manufactured to exacting standards with Class 2A thread fit tolerance for consistent performance. The 5/16"-18 UNC coarse thread pattern ensures compatibility with standard components. Full compliance with ASME B18.6.3 manufacturing specifications guarantees dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use across various industrial sectors.
