S-91771A891 3-48 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, ideal for harsh industrial environments.
- High tensile strength of 80,000 psi ensures reliable fastening under significant mechanical stress.
- Rockwell B80 hardness provides excellent durability and resistance to wear over time.
- Undercut flat head design with 82° countersink angle allows for a flush, secure fit in countersunk holes.
- Class 2A thread fit and UNC coarse threading enable quick, easy assembly and disassembly.
- Phillips No. 1 drive offers efficient torque transfer and reduces the risk of cam-out during installation.
- Full threading along the 1/2" length maximizes grip and holding power in various materials.
Professional Applications & Engineering Value
This 3-48 UNC flat head screw is engineered to address critical challenges in industrial assembly, such as vibration loosening and material fatigue. The passivated 18-8 stainless steel provides exceptional resistance to rust and chemical exposure, making it suitable for applications in electronics, machinery, and outdoor equipment where environmental factors are a concern. The undercut head profile and 82° countersink angle ensure a low-profile, secure seating that prevents protrusion and improves aerodynamic or aesthetic surfaces. With its coarse thread spacing and fully threaded design, it offers superior pull-out strength and faster installation in soft metals or plastics, reducing labor time and enhancing structural integrity in high-stress environments.
Specification Summary & Compliance
This screw adheres to ASME B18.6.3 specifications for dimensional accuracy and performance. It features a Class 2A thread fit for consistent engagement and a right-hand UNC thread with coarse spacing. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures it is free from hazardous substances, supporting safe and sustainable industrial use.
