S-91771A881 12-24 x 3/8" 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 environments and extended service life
- High tensile strength of 80,000 psi ensures reliable performance under heavy loads and vibration
- Class 2A thread fit provides consistent, easy assembly and reduces the risk of cross-threading
- 82° countersink angle and flat head design allows for a flush, secure fit in tapered seats
- Fully threaded shank offers maximum grip and holding power along the entire fastener length
- No. 3 Phillips drive enables efficient installation with common tools, speeding up assembly processes
- Rockwell B80 hardness provides excellent durability and resistance to wear and deformation
Professional Applications & Engineering Value
These 12-24 UNC flat head screws are engineered to address critical challenges in industrial assembly, including vibration loosening, corrosion-induced failure, and inconsistent seating. The passivated 18-8 stainless steel material offers exceptional resistance to rust and chemical exposure, making these fasteners ideal for applications in marine, chemical processing, and outdoor equipment. The coarse UNC thread and Class 2A fit ensure quick, reliable engagement in a variety of materials, reducing installation time and improving joint integrity. The flat head with 82° countersink provides a smooth, flush finish, essential for aerodynamic surfaces, machinery panels, and assemblies where protrusions are unacceptable. These screws deliver long-term reliability in demanding environments, from heavy machinery to electronic enclosures.
Specification Summary & Compliance
This fastener features a 12-24 UNC coarse thread with Class 2A thread fit for standard tolerance and easy assembly. It is manufactured in compliance with ASME B18.6.3 specifications, ensuring dimensional accuracy and performance consistency. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.
