S-97763A323 4-40 x 1" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive 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 Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments
- Superior thread engagement and vibration resistance due to Class 3A thread fit and UNC coarse thread spacing
- High tensile strength of 70,000 psi ensures reliable, long-lasting fastening under demanding loads
- Easy installation and removal with hex drive design, reducing assembly time and tool wear
- Consistent performance and durability backed by Rockwell B55 hardness and fully threaded 1" length
- Rounded button head profile provides a low-profile, finished appearance while minimizing snagging
- Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for global supply chain compatibility
Professional Applications & Engineering Value
These 4-40 UNC thread rounded head screws are engineered to address critical fastening challenges in industrial and precision assembly. The Black-Oxide 18-8 Stainless Steel construction offers enhanced corrosion resistance, making them suitable for applications exposed to moisture, chemicals, or outdoor conditions. The Class 3A thread fit and coarse thread spacing ensure quick assembly and superior resistance to loosening under vibration, common in machinery, electronics, and automotive components. The hex drive style allows for high torque application without cam-out, while the fully threaded design provides uniform clamping force along the entire 1" length. Ideal for securing panels, enclosures, and structural parts, these screws deliver reliable performance where precision, strength, and regulatory compliance are paramount.
Specification Summary & Compliance
This product meets ASME B18.3 specifications for dimensional accuracy and performance. Threads conform to UNC standards with Class 3A fit, ensuring precise engagement and interchangeability. The screws are manufactured from 18-8 Stainless Steel with a Black-Oxide finish and are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they are free of restricted substances and safe for use in various international markets.
