S-91099A464 5-40 x 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 with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Superior holding power from 80,000 PSI tensile strength and Rockwell B80 hardness for reliable, long-term fastening
- Efficient installation and flush finish with the 82° countersink angle and undercut flat head design
- Quick assembly with coarse UNC threads and Class 2A thread fit, ensuring consistent engagement and reduced cross-threading risk
- Secure torque transfer using the No. 1 Phillips drive style, minimizing cam-out during high-torque applications
- Full thread coverage along the 1/4" length for maximum grip and load distribution in various material thicknesses
- Compliance with rigorous standards including ASME B18.6.3, RoHS 3, and REACH for quality and environmental safety
Professional Applications & Engineering Value
These 5-40 UNC flat head screws are engineered to address common industrial challenges, such as vibration loosening and corrosion in demanding settings. The passivated 18-8 stainless steel provides excellent resistance to rust and chemicals, extending service life in machinery, electronics, and outdoor equipment. The fully threaded coarse UNC design ensures rapid installation and strong holding power in metals and plastics, while the undercut flat head with an 82° countersink angle allows for a seamless, flush finish that reduces snagging and improves aesthetics. Ideal for assembly lines and maintenance, these Phillips drive screws offer reliable performance where high tensile strength and regulatory compliance are critical.
Specification Summary & Compliance
This product adheres to precise dimensional standards, including Class 2A thread fit for consistent assembly and UNC coarse threading (5-40 size) with a length of 1/4". Manufacturing follows ASME B18.6.3 specifications, ensuring uniformity and reliability. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.
