S-91737A076 4-40 x 5/16" 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 18-8 Stainless Steel construction and passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable, long-term fastening
- Optimized drive engagement through Phillips No. 1 drive style, reducing cam-out and improving installation efficiency
- Precise thread fit with Class 2A UNC coarse threads ensuring consistent engagement and vibration resistance
- Enhanced clearance and aesthetic profile with high, narrow fillister head design for professional applications
- Full threading capability providing maximum grip length and uniform load distribution
- Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for global market acceptance
Professional Applications & Engineering Value
These 4-40 UNC Rounded Head Screws deliver critical performance advantages in precision assemblies where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 Stainless Steel material and passivated finish provides exceptional protection against oxidation and chemical exposure, making them ideal for electronic enclosures, medical devices, and marine equipment. The fillister head design offers superior clearance for countersunk applications while the Phillips drive ensures efficient installation in automated or manual assembly processes. With fully threaded construction and Class 2A fit, these screws maintain consistent clamping force in vibrating environments, preventing loosening in industrial machinery, aerospace components, and precision instruments where dimensional stability is critical.
Specification Summary & Compliance
Manufactured to exacting standards with Class 2A thread fit per UNC specifications, ensuring precise dimensional accuracy and interchangeability. These rounded head screws comply with ASME B18.6.3 manufacturing standards for consistent quality and performance. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming adherence to hazardous substance restrictions for global industrial applications.
