S-91099A466 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, ideal for harsh industrial environments
- High tensile strength of 80,000 psi ensures reliable performance under heavy loads and vibration
- Class 2A thread fit provides smooth assembly and consistent engagement in UNC coarse threaded applications
- 82° countersink angle with undercut head profile allows for flush mounting and reduced risk of material splitting
- Fully threaded design maximizes grip length and load distribution across the entire fastener
- Phillips drive (No. 1 size) offers familiar, efficient installation with standard tools
- Rockwell B80 hardness maintains thread integrity and durability through repeated use
Professional Applications & Engineering Value
These 5-40 UNC flat head Phillips machine screws are engineered to address common industrial challenges such as corrosion-induced failure and assembly inefficiency. The passivated 18-8 stainless steel provides exceptional resistance to moisture, chemicals, and oxidation, making them ideal for marine equipment, food processing machinery, and outdoor enclosures. The coarse UNC threading ensures quick installation and secure holding power in softer materials or where vibration resistance is critical. The flat head with 82° countersink creates a smooth, flush surface that prevents snagging and improves aesthetic finish in visible applications. Manufactured to ASME B18.6.3 specifications, these screws deliver consistent dimensional accuracy and reliable performance in high-stress assemblies.
Specification Summary & Compliance
This screw features a 5-40 UNC coarse thread with Class 2A fit for standard tolerance applications, fully threaded 1/2" length, and right-hand thread direction. It complies with ASME B18.6.3 manufacturing standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries.
