S-91771A938 4-40 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 thanks to passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh environments
- Exceptional tensile strength of 80,000 psi provides reliable fastening under high-stress industrial applications
- Rockwell B80 hardness rating maintains thread integrity and prevents stripping during installation
- Class 2A thread fit with UNC coarse threading enables quick assembly and secure holding power
- 100° countersink angle with standard flat head profile creates flush surface finishes for streamlined assemblies
- Phillips No. 1 drive design offers familiar, efficient installation with standard tools
- Full compliance with ASME B18.6.3, RoHS 3, and REACH ensures meeting strict industrial and environmental standards
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical performance advantages for industrial applications where corrosion resistance and reliable fastening are paramount. The passivated 18-8 stainless steel construction provides excellent protection against rust and chemical exposure, making them ideal for manufacturing equipment, electronic enclosures, and marine components. The fully threaded design with coarse UNC threading ensures maximum grip strength in various materials, while the standard flat head profile with 100° countersink angle allows for seamless surface integration. Engineered to ASME B18.6.3 specifications, these Phillips drive screws offer consistent performance in automated assembly processes and maintenance applications where vibration resistance and long-term durability are essential.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (4-40 size) and right-hand thread direction. These 1/2" length screws feature standard inch measurements and comply with ASME B18.6.3 manufacturing specifications. Full regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use across global industrial markets.
