S-91771A107 4-40 x 5/16" 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
- Exceptional 80,000 psi tensile strength ensures reliable fastening under high-stress applications
- Precise Class 2A thread fit guarantees smooth installation and consistent engagement in mating components
- 82° countersink angle and flat head design provides flush mounting for clean, professional finishes
- Fully threaded UNC coarse spacing delivers maximum grip length and faster assembly times
- Phillips #1 drive compatibility enables efficient installation with standard industrial tools
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH ensures regulatory adherence
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 4-40 UNC flat head screws solve critical fastening challenges through their passivated 18-8 stainless steel composition and precision manufacturing. The combination of 80,000 psi tensile strength and Rockwell B80 hardness provides exceptional resistance to vibration loosening and mechanical stress in machinery, electronics, and structural assemblies. The 82° countersink angle ensures seamless flush mounting in precision components, while the fully threaded coarse UNC design maximizes thread engagement in various materials. These Phillips #1 drive screws are particularly valuable in applications requiring corrosion-resistant fasteners that maintain integrity in moist or chemical-exposed environments, from control panels to marine equipment.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances for consistent performance. The UNC coarse thread (4-40) with right-hand threading ensures industry-standard compatibility. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming hazardous substance restrictions are met for global industrial applications.
