S-90909A617 4-40 x 1/2" ASME B18.3 Stainless Steel Flanged Button Head Hex-Drive Screws
Stainless Steel Flanged 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 316 stainless steel construction, ideal for harsh environments and chemical exposure
- High tensile strength of 70,000 psi ensures reliable performance under mechanical stress and vibration
- Precise Class 3A thread fit provides secure fastening with minimal risk of loosening in critical assemblies
- Flanged design with wide button head distributes clamping force evenly, reducing surface damage and improving stability
- Hex drive (1/16") allows for easy installation and removal with standard tools, speeding up maintenance
- Fully threaded 4-40 UNC coarse thread offers quick engagement and strong holding power in various materials
- Compliance with ASME B18.3, RoHS 3, and REACH ensures quality, safety, and environmental standards for industrial use
Professional Applications & Engineering Value
This 316 stainless steel rounded head screw with a 4-40 UNC coarse thread and Class 3A fit is engineered to address common industrial challenges like corrosion, vibration loosening, and assembly efficiency. The flanged design and wide button head enhance load distribution, preventing surface indentation and ensuring a tight seal in applications such as machinery, electronics, and marine equipment. Made from 316 stainless steel, it resists pitting and oxidation in saline or acidic conditions, while the fully threaded and right-hand thread configuration allows for rapid installation and robust fastening. Ideal for industrial screws in demanding sectors, it combines durability with regulatory compliance to minimize downtime and maintenance costs.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 3A thread fit for high precision, a length of 1/2", and a flange diameter of 0.234". It is manufactured in accordance with ASME B18.3 standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets strict environmental and safety requirements for industrial applications.
