S-91771A562 1/4"-28 x 1 1/8" 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 from passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh environments
- Exceptional tensile strength rated at 80,000 psi for secure, vibration-resistant fastening in demanding applications
- Precision Class 2A thread fit guarantees smooth installation and consistent engagement with mating components
- Optimized Phillips No. 3 drive provides excellent torque transfer and reduces cam-out during installation
- Standard 82° countersink angle enables flush mounting for clean, professional finishes
- Full threading design maximizes grip length and distributes clamping force evenly across the entire fastener
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH ensures quality and environmental responsibility
Professional Applications & Engineering Value
These 1/4"-28 UNF flat head Phillips screws deliver critical performance advantages for industrial applications where corrosion resistance and reliable fastening are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making these flat head screws ideal for marine equipment, food processing machinery, and outdoor installations. The fine UNF threading and Class 2A fit ensure precise engagement in tapped holes, reducing the risk of cross-threading while maintaining consistent clamping force. The 82° countersink angle and standard flat head profile create seamless surface finishes in countersunk applications, eliminating protrusions that could interfere with moving components or create safety hazards.
Specification Summary & Compliance
This 1/4"-28 UNF flat head screw features Class 2A thread fit precision with fully threaded design and standard 82° countersink angle. Manufactured to exacting ASME B18.6.3 specifications with dimensional accuracy including 0.477" head diameter and 1 1/8" length. The fastener demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring responsible manufacturing practices and material safety.
