S-91771A141 2-56 x 1 1/4" 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
- Exceptional corrosion resistance from passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Superior mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under stress
- Precision thread engagement with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
- Optimized flush mounting featuring standard 82° countersink angle for seamless surface integration
- Enhanced drive stability with Phillips No. 1 drive design providing secure torque transmission
- Full-threaded reliability delivering maximum grip strength across the entire 1-1/4" length
- Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
These 2-56 UNC flat head screws deliver critical engineering solutions where corrosion resistance and flush surface requirements are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making them ideal for industrial machinery, electronic enclosures, and marine applications. The combination of coarse UNC threads and Class 2A thread fit ensures rapid installation and reliable performance in vibration-prone environments. The standard 82° countersink angle allows for perfect flush mounting in precision assemblies, while the Phillips No. 1 drive facilitates efficient installation without compromising head integrity. These fully threaded machine screws maintain consistent 80,000 psi tensile strength throughout their length, providing uniform clamping force in critical fastening applications.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread specifications. Complies with ASME B18.6.3 mechanical standards for flat head screws. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements. Features right-hand thread direction and standard flat head profile with 82° countersink angle for industry-standard compatibility.
