S-97763A322 4-40 x 3/4" 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
- Superior corrosion resistance with black-oxide coated 18-8 stainless steel, ideal for harsh industrial environments
- Precise thread engagement with Class 3A thread fit ensuring reliable, vibration-resistant fastening
- High tensile strength of 70,000 psi provides exceptional load-bearing capacity for demanding applications
- Rockwell B55 hardness offers excellent durability and resistance to wear and deformation
- Hex drive design (1/16") allows for secure tool engagement and efficient installation
- Fully threaded shank maximizes grip strength and distributes stress evenly along the entire length
- Compliance with ASME B18.3, RoHS 3, and REACH ensures regulatory adherence for global industrial use
Professional Applications & Engineering Value
These 4-40 UNC thread rounded head screws are engineered to address critical fastening challenges in industrial settings. The black-oxide 18-8 stainless steel construction provides exceptional corrosion resistance, making them suitable for outdoor equipment, marine components, and chemical processing machinery where moisture and corrosive agents are present. The Class 3A thread fit and coarse thread spacing ensure quick assembly and reliable performance in high-vibration environments such as automotive assemblies, electrical enclosures, and heavy machinery. With a 70,000 psi tensile strength and fully threaded design, these screws deliver consistent clamping force and prevent loosening under dynamic loads, reducing maintenance needs and enhancing operational safety in precision engineering applications.
Specification Summary & Compliance
These screws feature precise Class 3A thread fit per UNC standards, ensuring tight tolerances for secure fastening. Manufacturing adheres to ASME B18.3 specifications, guaranteeing dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting environmentally responsible sourcing for industrial applications.
