S-91771A128 5-40 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, ensuring longevity in harsh industrial environments
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under high stress
- Precision thread engagement through Class 2A thread fit and fully threaded design, providing secure fastening and vibration resistance
- Streamlined installation with Phillips No. 2 drive and standard flat head profile, enabling efficient assembly with common tools
- Optimal flush mounting featuring 82° countersink angle for seamless surface integration in precision applications
- Industry-standard compatibility with UNC coarse threading and right-hand direction, ensuring interchangeability across equipment
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards for global deployment
Professional Applications & Engineering Value
These 5-40 UNC flat head screws deliver critical engineering advantages in industrial fastening systems. The passivated 18-8 stainless steel construction provides exceptional resistance to oxidation and chemical exposure, making them ideal for manufacturing equipment, electronic enclosures, and marine components where environmental durability is paramount. The combination of Class 2A thread fit with coarse thread spacing ensures rapid assembly while maintaining vibration-resistant connections. The fully threaded design maximizes grip length distribution, while the 82° countersink angle creates flush surfaces in precision machinery and aerospace applications. These Phillips drive screws offer reliable performance in automated assembly lines and maintenance operations where consistent torque application is essential.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards with Class 2A thread tolerance for precision fit. Features UNC coarse threads with right-hand direction and 1/2" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include 80,000 psi tensile strength and Rockwell B80 hardness certification.
