S-98164A061 4-40 x 1/4" 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 in harsh environments due to 316 stainless steel construction and passivated finish.
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term fastening.
- Precise and secure thread engagement ensured by the Class 3A fit and 4-40 UNC coarse thread profile, reducing the risk of cross-threading.
- Easy installation and removal with a standard hex drive, providing a positive grip for efficient assembly.
- Streamlined, low-profile design from the rounded button head, ideal for applications where clearance is a concern.
- Full regulatory compliance with ASME B18.3, RoHS 3, and REACH, ensuring product safety and environmental responsibility.
- Versatile fastening solution with a 1/4" length and fully threaded body for consistent performance across various material thicknesses.
Professional Applications & Engineering Value
Engineered for demanding industrial environments, this 316 Stainless Steel Rounded Head Screw provides a robust solution to common challenges like corrosion and vibration-induced loosening. Its passivated finish significantly enhances resistance to chemicals and moisture, making it ideal for marine, chemical processing, and food-grade equipment. The 4-40 UNC coarse thread and Class 3A fit offer superior holding power and easier alignment in softer materials or pre-tapped holes, reducing assembly time and improving joint integrity. The combination of high tensile strength and a low-profile rounded head makes it a reliable choice for compact assemblies in electronics, machinery, and automotive applications where both performance and a clean aesthetic are required.
Specification Summary & Compliance
This screw adheres to precise dimensional and performance standards, including a Class 3A thread fit for high-precision applications and manufacturing in accordance with the ASME B18.3 specification. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its commitment to environmental safety and restricted substance control.
