S-91771A298 12-24 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
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional tensile strength of 80,000 PSI ensures reliable performance under high-stress applications
- Precise Class 2A thread fit guarantees smooth installation and secure fastening in mating components
- 82° countersink angle provides flush mounting for clean, professional finishes in visible applications
- Full threading along 1-1/4" length enables maximum grip and adjustment flexibility in assemblies
- Rockwell B80 hardness rating maintains thread integrity and prevents stripping during repeated use
- Phillips No. 3 drive compatibility offers widespread tool accessibility for efficient installation
Professional Applications & Engineering Value
These 12-24 UNC flat head screws deliver critical engineering solutions where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making these machine screws ideal for manufacturing equipment, marine hardware, and food processing machinery. The coarse UNC threading ensures rapid installation in soft materials and castings, while the standard flat head profile with 82° angle creates seamless surface transitions. With full threading across the entire 1-1/4" length, these fasteners maintain consistent clamping force in deep-tapped holes and structural joints, preventing loosening from vibration and thermal cycling in demanding industrial environments.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerances for precision engagement. Features UNC coarse threads in right-hand orientation with standard 82° countersink angle. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
