S-91500A126 4-40 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 316 stainless steel construction, ideal for harsh environments and chemical exposure
- Enhanced durability and strength from Rockwell B80 hardness and 70,000 psi tensile strength for reliable, long-term performance
- Secure, flush installation with standard 82° countersink angle and flat head design for smooth surfaces and reduced snagging
- Easy, efficient driving using Phillips No. 1 drive, minimizing cam-out and speeding up assembly in industrial settings
- Consistent, precise threading with fully threaded 4-40 UNC coarse thread and Class 2A fit for quick engagement and vibration resistance
- Environmental and regulatory compliance with RoHS 3 and REACH standards, ensuring safe, sustainable use in global markets
- Broad application versatility backed by ASME B18.6.3 specifications, guaranteeing interchangeability and quality in OEM and MRO uses
Professional Applications & Engineering Value
These 4-40 UNC flat head Phillips screws in 316 stainless steel address critical industrial challenges, such as corrosion in marine, chemical, and outdoor settings, thanks to their passivated finish enhancing surface protection. The fully threaded coarse design and Class 2A thread fit ensure rapid assembly and reliable hold in materials prone to vibration, reducing maintenance needs. Ideal for machinery, electronics, and structural components, they provide a flush mount with their 82° countersink angle, preventing protrusions that could compromise safety or aesthetics. By meeting ASME B18.6.3 standards, these screws deliver consistent performance in OEM production and repair operations, streamlining procurement and reducing downtime.
Specification Summary & Compliance
This screw adheres to precise dimensional tolerances, including Class 2A thread fit for consistent engagement and UNC coarse threads per standard inch measurements. It conforms to ASME B18.6.3 for mechanical and dimensional requirements, ensuring reliability in industrial fastening. Environmental compliance is confirmed with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), supporting use in regulated sectors without hazardous substances.
