S-91771A109 4-40 x 7/16" 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
- Exceptional corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Superior holding power from 80,000 PSI tensile strength and Rockwell B80 hardness for reliable, long-term fastening
- Maximum thread engagement through full threading design, ensuring secure connections across the entire screw length
- Precise flush mounting with standard 82° countersink angle and flat head profile for seamless surface integration
- Optimized drive efficiency using Phillips No. 1 drive style, reducing cam-out risks during installation
- Consistent performance guaranteed by Class 2A thread fit and UNC coarse threading for easy assembly and vibration resistance
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 4-40 UNC flat head screws solve critical fastening challenges in corrosive or high-stress environments. The passivated 18-8 stainless steel construction provides exceptional resistance to oxidation and chemical exposure, making them ideal for marine equipment, food processing machinery, and outdoor installations. With fully threaded design and Class 2A thread fit, they ensure maximum thread contact and reliable clamping force in thin materials or tight spaces. The 82° countersink angle and flat head profile enable flush mounting without protrusion, preventing snagging while maintaining aerodynamic or aesthetic surfaces. These Phillips drive screws combine installation convenience with the durability needed for heavy-duty assemblies requiring repeated maintenance or exposure to extreme conditions.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading (4-40 size). Complies with ASME B18.6.3 mechanical specifications and maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include 7/16" length, standard flat head profile, and right-hand thread direction for consistent performance across industrial applications.
