S-91771A043 4-40 x 11/16" 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 mechanical strength offering 80,000 psi tensile strength and Rockwell B80 hardness for reliable, long-lasting fastening.
- Precise thread engagement with Class 2A thread fit and UNC coarse threading, ensuring easy installation and secure hold.
- Optimized flush mounting featuring an 82° countersink angle and standard flat head profile for seamless, low-profile assemblies.
- Enhanced drive efficiency with a No. 1 Phillips drive, reducing cam-out and improving torque application during installation.
- Full threading along the 11/16" length provides maximum grip and uniform stress distribution in various materials.
- Compliance with major standards including ASME B18.6.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
These 4-40 UNC flat head screws are engineered to address common industrial challenges such as vibration loosening and environmental degradation. The passivated 18-8 stainless steel offers excellent resistance to rust and chemicals, making them suitable for applications in electronics, machinery, and outdoor equipment where durability is critical. The coarse UNC threads and Class 2A thread fit facilitate quick assembly while maintaining tight tolerances, reducing the risk of strip-out in softer materials. With an 82° countersink angle and Phillips drive, these screws ensure a flush finish and efficient installation, enhancing the structural integrity and aesthetic of assemblies in automotive, aerospace, and general manufacturing sectors.
Specification Summary & Compliance
This screw adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse threading (4-40 size) with a length of 11/16". It is manufactured in compliance with ASME B18.6.3 specifications and meets environmental regulations such as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it is free from hazardous substances and suitable for global industrial use.
