S-90471A451 5/16"-18 x 1 1/4" 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
- Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
- Exceptional mechanical strength with 60,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
- Precision thread engagement with Class 2A fit and UNC coarse threads ensuring secure fastening and vibration resistance
- Optimized flush mounting with standard 100° countersink angle and flat head design for seamless surface integration
- Efficient installation through Phillips No. 4 drive system providing positive torque transfer and reduced cam-out
- Full-threaded design offering maximum grip length and uniform stress distribution across the entire fastener
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards for global industrial use
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these zinc-plated steel flat head screws deliver critical performance where surface flushness and corrosion resistance are paramount. The 5/16"-18 UNC coarse thread configuration provides superior holding power in various materials, while the Class 2A thread fit ensures consistent engagement without binding. The fully threaded design maximizes pull-out resistance, making these Phillips drive screws ideal for machinery assembly, electrical enclosures, and structural components where vibration resistance is essential. The 100° countersink angle creates a clean, recessed finish that eliminates protrusions in precision applications, while the zinc plating provides sacrificial protection against environmental degradation in manufacturing facilities, outdoor equipment, and marine-adjacent installations.
Specification Summary & Compliance
These flat head screws feature precision UNC coarse threads with Class 2A tolerance for consistent fit and reliable performance. Manufacturing complies with ASME B18.6.3 specifications ensuring dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming restriction of hazardous substances for global industrial applications.
