S-91771A937 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
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional mechanical strength delivering 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Precision thread engagement with Class 2A fit and UNC coarse threading for secure fastening and vibration resistance
- Optimized flush mounting featuring a standard flat head profile with 100° countersink angle for seamless surface integration
- Enhanced installation efficiency through No. 1 Phillips drive design, enabling quick assembly with standard tools
- Full-threaded design ensuring maximum grip length and uniform stress distribution across the entire 7/16" length
- Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations (RoHS 3, REACH) for global supply chain compatibility
Professional Applications & Engineering Value
These 4-40 UNC flat head screws provide critical solutions for precision assembly challenges where surface flushness and corrosion resistance are paramount. The passivated 18-8 stainless steel construction prevents galvanic corrosion in electrical enclosures, marine hardware, and food processing equipment, while the 80,000 psi tensile strength maintains joint integrity under dynamic loads. The fully threaded design with coarse thread spacing ensures superior pull-out resistance in soft materials and plastics, making them ideal for industrial fasteners in automotive trim, aerospace panels, and electronic chassis. The standardized 100° countersink angle and Phillips drive enable rapid installation in high-volume production environments without compromising structural reliability.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerances and UNC coarse threads (4-40 size). Dimensions include 7/16" length, 0.212" head diameter, and No. 1 Phillips drive. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries.
