S-92949A112 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
- Exceptional corrosion resistance thanks to 18-8 stainless steel construction and a passivated finish, ideal for harsh industrial environments.
- Superior mechanical strength with a 70,000 psi tensile strength and Rockwell B55 hardness for reliable, high-stress fastening.
- Precise and secure thread engagement achieved with a Class 3A thread fit and UNC coarse threads, reducing the risk of cross-threading.
- Efficient installation and removal provided by the 1/16" hex drive, allowing for high torque application in confined spaces.
- Versatile fully threaded design ensures maximum grip and holding power along the entire 5/8" length.
- Compliant with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
- Rounded button head profile offers a low-profile, aesthetically pleasing finish that minimizes snagging.
Professional Applications & Engineering Value
These 4-40 UNC thread rounded head screws are engineered to solve critical fastening challenges in demanding applications. The combination of 18-8 Stainless Steel and a passivated finish provides outstanding resistance to oxidation and chemical exposure, making them perfect for machinery, electronics, and marine equipment where corrosion resistance is paramount. The Class 3A thread fit and coarse threading ensure rapid assembly and a vibration-resistant hold, reducing maintenance needs. The hex drive and button head design facilitate installation in tight spaces, providing a reliable, high-strength connection that upholds the integrity of your assembly under significant load.
Specification Summary & Compliance
This product adheres to a Class 3A thread fit per the UNC (Unified National Coarse) standard, ensuring precise dimensional accuracy. Manufacturing and quality are governed by the ASME B18.3 specification. The screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they are free from hazardous substances and safe for use in regulated markets.
