S-91500A124 4-40 x 5/16" 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 in harsh environments thanks to 316 Stainless Steel construction and passivated finish
- Exceptional mechanical strength with a 70,000 psi tensile strength and Rockwell B80 hardness for reliable, long-lasting performance
- Optimized for flush mounting with a standard 82° countersink angle and flat head design for a clean, secure finish
- Enhanced driving efficiency and reduced cam-out risk with the Phillips No. 1 drive style
- Robust thread engagement and holding power from the fully threaded 4-40 UNC coarse thread
- Precise and reliable fit ensured by the Class 2A thread fit for consistent assembly quality
- Broad industry compliance meeting ASME B18.6.3 specifications and global environmental standards like RoHS 3 and REACH
Professional Applications & Engineering Value
These 4-40 UNC flat head screws are engineered to solve critical challenges in demanding industrial settings. The core value lies in the 316 Stainless Steel material, which provides outstanding resistance to chemicals, saltwater, and other corrosive agents, making these Phillips drive screws ideal for marine, chemical processing, and food industry applications where durability is non-negotiable. The fully threaded design and coarse thread (UNC) ensure rapid installation and superior vibration resistance, preventing loosening in dynamic assemblies. Combined with the passivated finish, this screw offers an extended service life and maintains integrity under high stress, providing a reliable industrial fastener solution that minimizes maintenance and replacement costs.
Specification Summary & Compliance
This product adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and the UNC coarse thread series. Manufacturing and quality are governed by the ASME B18.6.3 specification. Furthermore, these screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring they are free of hazardous substances and suitable for use in regulated markets and environmentally conscious projects.
