S-91099A456 1/4"-20 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 with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Optimized flush installation featuring an undercut flat head with 82° countersink angle for secure, vibration-resistant seating
- Efficient assembly with Phillips No. 3 drive design providing secure tool engagement and reduced cam-out risk
- Precision threading with UNC coarse spacing and Class 2A fit ensuring consistent engagement and vibration resistance
- Full-threaded design maximizing grip length and pull-out resistance across the entire fastener length
- Regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for global industrial applications
Professional Applications & Engineering Value
These passivated 18-8 stainless steel flat head screws deliver critical performance advantages in demanding applications where corrosion resistance and mechanical reliability are paramount. The undercut flat head profile with 82° countersink angle ensures flush mounting while preventing surface lifting under vibration, making them ideal for machinery, automotive assemblies, and electronic enclosures requiring smooth surfaces. The combination of UNC coarse threading with Class 2A fit provides excellent engagement in various materials while resisting loosening. With 80,000 psi tensile strength and full threading, these screws maintain structural integrity in high-stress applications while the Phillips No. 3 drive offers efficient installation without specialized tools.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance and UNC coarse thread spacing. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. Features include 1/4"-20 thread size, 1" length, right-hand thread direction, and full threading throughout the fastener body.
