S-91771A882 1/4"-20 x 1 5/8" 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 mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Precision threading with UNC coarse threads and Class 2A fit ensures smooth installation and secure fastening
- Optimized flush mounting featuring standard 82° countersink angle for seamless surface integration
- Enhanced drive engagement with No. 3 Phillips drive providing secure torque transmission and reduced cam-out risk
- Full-threaded design delivers maximum grip length and uniform stress distribution across the entire fastener
- Regulatory compliance meets ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These 1/4"-20 UNC Flat Head Phillips machine screws deliver critical engineering solutions where surface flushness and corrosion resistance are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making them ideal for industrial machinery, marine equipment, and food processing applications. The combination of coarse threading and Class 2A thread fit ensures rapid installation while maintaining vibration resistance in high-stress assemblies. The 82° countersink angle creates seamless surface transitions, eliminating protrusions that could interfere with moving components or create safety hazards. With full threading along the entire 1-5/8" length, these flat head screws distribute clamping forces evenly, preventing joint loosening under dynamic loads.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerances for consistent performance. Features UNC coarse threads (1/4"-20) with right-hand orientation and standard flat head profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The fully threaded design and precise 82° countersink angle maintain dimensional accuracy for reliable flush mounting applications.
