S-98164A433 4-40 x 5/8" 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 in harsh environments due to 316 stainless steel construction and passivated finish
- Exceptional mechanical reliability with a high 70,000 psi tensile strength and Rockwell B55 hardness
- Precise, secure fastening ensured by the Class 3A thread fit for reduced backlash and vibration loosening
- Easy installation and removal with the 1/16" hex drive, providing positive tool engagement
- Optimized for rapid assembly using the 4-40 UNC coarse thread, which resists cross-threading
- Versatile rounded (button) head design offers a low-profile, finished appearance while distributing clamp load effectively
- Full 5/8" length threading maximizes grip range and holding power in various material thicknesses
Professional Applications & Engineering Value
This 316 stainless steel rounded head screw is engineered to solve critical challenges in demanding sectors like chemical processing, marine, and food equipment, where exposure to chlorides and acidic agents is common. The passivated finish enhances the innate corrosion resistance of the 316 alloy, significantly extending service life and reducing maintenance costs. Its 4-40 UNC coarse thread and Class 3A fit provide a precise, reliable connection that withstands vibration and thermal cycling, preventing joint failure. The combination of 70,000 psi tensile strength and a rounded head with hex drive ensures high clamp load retention and easy installation in confined spaces, making it an optimal industrial fastener for machinery, enclosures, and structural assemblies requiring durability and chemical resilience.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with a precision Class 3A thread fit for consistent dimensional accuracy. It is manufactured in compliance with the ASME B18.3 standard, ensuring interchangeability and performance reliability. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.
