S-91771A126 5-40 x 3/8" 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, long-term fastening in demanding applications
- Precise Class 2A thread fit provides smooth installation and consistent clamping force
- 82° countersink angle allows for flush mounting and clean, professional finishes
- Phillips drive design enables efficient installation with standard tools while minimizing cam-out
- Full threading along the entire 3/8" length maximizes grip and load distribution
- Rockwell B80 hardness maintains structural integrity under repeated stress and vibration
Professional Applications & Engineering Value
These 5-40 UNC flat head screws deliver exceptional performance in critical industrial applications where reliability and corrosion resistance are paramount. The passivated 18-8 stainless steel construction provides superior protection against rust and chemical exposure, making them ideal for machinery, electronic enclosures, and outdoor equipment. The coarse UNC thread design ensures quick installation and superior holding power in various materials, while the standard flat head profile with 82° countersink angle creates seamless, flush surfaces that prevent snagging and improve safety. Engineered to withstand vibration and thermal cycling, these fully threaded screws maintain consistent clamping force in automotive, aerospace, and manufacturing applications where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit for consistent dimensional accuracy. Features 5-40 UNC coarse threads with right-hand orientation and standard flat head profile. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The Rockwell B80 hardness and 80,000 PSI tensile strength guarantee mechanical reliability in demanding industrial environments.
