S-91737A084 4-40 x 1/2" ASME B18.6.3 Stainless Steel Fillister Head Phillips Screws
Stainless Steel Fillister Head Phillips 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, ideal for harsh industrial environments and extended service life.
- High tensile strength of 80,000 psi ensures reliable fastening under stress, reducing the risk of mechanical failure.
- Rockwell B85 hardness provides excellent durability and resistance to wear, maintaining performance in repetitive applications.
- Class 2A thread fit with UNC coarse threading offers easy installation and secure holding power, minimizing assembly time.
- Fully threaded design allows for maximum grip and uniform load distribution across the entire length.
- Phillips drive with No. 1 size enables efficient torque application and reduces cam-out, enhancing installation precision.
- High, narrow fillister head profile facilitates better tool clearance and a flush fit in confined spaces.
Professional Applications & Engineering Value
These 4-40 UNC rounded head screws are engineered to address common industrial challenges, such as vibration loosening and environmental degradation. Made from 18-8 stainless steel with a passivated finish, they deliver exceptional corrosion resistance, making them ideal for applications in electronics, machinery, and automotive assemblies where moisture and chemicals are present. The coarse thread and Class 2A fit ensure quick, reliable fastening in materials like metals and plastics, reducing installation errors. The Phillips drive and high, narrow fillister head provide optimal torque transfer and space efficiency, supporting precision in tight layouts. By meeting ASME B18.6.3 standards, these screws offer consistent quality and performance for demanding B2B environments.
Specification Summary & Compliance
This product adheres to precise dimensional tolerances, including Class 2A thread fit and UNC coarse thread standards, ensuring compatibility and reliability. It complies with ASME B18.6.3 for manufacturing consistency and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its safety and sustainability for global industrial use.
