S-91771A972 1/4"-20 x 7/8" 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 industrial environments
- Exceptional holding power with 80,000 psi tensile strength and Rockwell B80 hardness for reliable, long-term fastening
- Optimized flush installation thanks to the standard flat head profile and 100° countersink angle
- Efficient installation and removal with No. 3 Phillips drive, reducing tool slippage and assembly time
- Secure thread engagement from the fully threaded UNC coarse design and Class 2A thread fit
- Broad industry compatibility meeting ASME B18.6.3 specifications for dimensional consistency
- Environmental and safety compliance with RoHS 3 and REACH regulations for responsible sourcing
Professional Applications & Engineering Value
This 1/4"-20 UNC flat head screw is engineered to address critical fastening challenges in demanding sectors like machinery assembly, electrical enclosures, and structural frameworks. The passivated 18-8 stainless steel provides excellent resistance to oxidation and chemical exposure, significantly extending service life in corrosive or high-moisture settings. The combination of coarse threading and Class 2A thread fit ensures quick, secure installation into a variety of materials, reducing the risk of cross-threading. The fully threaded design and flat head with 100° countersink allow for a flush, low-profile finish that minimizes protrusion and improves safety in dynamic applications. These features make it a reliable choice for engineers seeking durable, compliant industrial fasteners that maintain integrity under stress.
Specification Summary & Compliance
This screw adheres to precise dimensional standards with UNC coarse threads and a Class 2A thread fit for consistent performance. Manufacturing and quality are governed by ASME B18.6.3 specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets current environmental and safety requirements for hazardous substance restrictions.
