S-91773A103 4-40 x 1/8" ASME B18.6.3 Stainless Steel Round Head Phillips Screws
Stainless Steel Round 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
- Exceptional corrosion resistance with 18-8 Stainless Steel construction and passivated finish for long service life in harsh environments
- Superior holding power from fully threaded UNC coarse thread design that prevents loosening under vibration
- High tensile strength of 100,000 psi ensures reliable performance in demanding mechanical applications
- Precise Class 2A thread fit guarantees smooth installation and consistent engagement with mating components
- Optimized Phillips drive design provides secure tool engagement and reduces cam-out during installation
- Comprehensive compliance with ASME B18.6.3 standards ensures dimensional accuracy and interchangeability
- Environmental regulation compliance with RoHS 3 and REACH for use in regulated industries worldwide
Professional Applications & Engineering Value
These 4-40 UNC coarse thread rounded head screws deliver exceptional engineering value across industrial applications where corrosion resistance and mechanical reliability are critical. The 18-8 Stainless Steel composition combined with passivated finish provides superior protection against oxidation and chemical exposure, making them ideal for electronics enclosures, precision instruments, and marine equipment. The fully threaded design ensures maximum thread engagement and holding strength in shallow mounting scenarios, while the coarse UNC thread facilitates quick assembly and resists vibration-induced loosening. With Rockwell B100 hardness and precise Class 2A thread fit, these Phillips drive screws maintain dimensional stability and installation consistency in automated production environments, reducing assembly time and improving manufacturing efficiency.
Specification Summary & Compliance
This rounded head screw features precise 4-40 UNC coarse threads with Class 2A thread fit tolerance for reliable mating compatibility. Manufacturing specifications strictly adhere to ASME B18.6.3 standards for dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, ensuring suitability for global industrial markets and environmentally conscious applications.
