S-91099A462 4-40 x 1" 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 delivering 80,000 psi tensile strength and Rockwell B80 hardness for reliable fastening performance
- Precision thread engagement with Class 2A thread fit and UNC coarse threads ensuring secure installations
- Optimized flush mounting featuring undercut flat head design with 82° countersink angle for seamless surface integration
- Enhanced drive stability through Phillips No. 1 drive system preventing cam-out during installation
- Full regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
- Complete thread coverage with 1" fully threaded length providing maximum grip strength across applications
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering solutions where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against chemical exposure and environmental degradation, making them ideal for marine equipment, food processing machinery, and outdoor industrial applications. The undercut flat head profile with 82° countersink angle ensures flush mounting without surface protrusion, while the Phillips No. 1 drive maintains torque control during high-volume assembly operations. The coarse UNC threading combined with Class 2A fit guarantees rapid installation and vibration resistance in demanding environments where maintenance access is limited.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 standards with Class 2A thread fit precision and UNC coarse thread profile. The screws feature complete RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety. Mechanical properties include 80,000 psi tensile strength and Rockwell B80 hardness, ensuring consistent performance across industrial applications while maintaining dimensional accuracy per inch measurement specifications.
