S-91771A743 4-48 x 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless 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 passivated 18-8 stainless steel construction for extended service life in demanding environments
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness to withstand high-stress applications
- Precise thread engagement with Class 2A UNF fine threads ensuring reliable fastening and vibration resistance
- Optimized flush mounting featuring standard 82° countersink angle for seamless surface integration
- Efficient installation with Phillips No. 1 drive providing secure tool engagement and reduced cam-out risk
- Full threading coverage along the 1/2" length for maximum grip strength and load distribution
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards
Professional Applications & Engineering Value
These 4-48 UNF flat head screws deliver critical performance advantages for precision assembly applications where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making these Phillips flat head screws ideal for electronics enclosures, aerospace components, and marine equipment. The fine UNF threading with Class 2A fit ensures superior vibration resistance in dynamic environments, while the 82° countersink angle creates a flush surface finish critical for aerodynamic and aesthetic applications. The combination of 80000 psi tensile strength and fully threaded design provides maximum clamping force distribution, preventing joint failure in high-stress industrial assemblies.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerances for precision assembly. The 4-48 UNF fine thread configuration with right-hand threading ensures compatibility with standard industrial components. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use across global markets. The Rockwell B80 hardness rating and controlled passivation treatment provide consistent performance meeting industrial quality requirements.
