S-92949A346 5/16"-18 x 4 1/2" 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 18-8 Stainless Steel construction and passivated finish, ideal for harsh industrial environments.
- High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, heavy-duty fastening.
- Precision Class 3A thread fit ensures tight, secure connections and reduces the risk of cross-threading in critical assemblies.
- Easy installation and removal with a 3/16" hex drive, providing excellent torque transfer and tool compatibility.
- Fully threaded coarse (UNC) design delivers maximum grip and holding power across the entire 4 1/2" length.
- Low-profile rounded (button) head offers a smooth finish and reduced snagging in applications where clearance is a concern.
- Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
This 5/16"-18 UNC fully threaded screw is engineered to solve common industrial challenges, such as vibration loosening and material fatigue. The 18-8 Stainless Steel material, combined with a passivated finish, provides exceptional resistance to rust and chemical exposure, making it suitable for outdoor machinery, marine equipment, and food processing facilities. The coarse thread and Class 3A fit enhance assembly speed and reliability, reducing downtime in production lines. With a hex drive for secure tool engagement and a rounded head for smooth surfaces, it ensures both performance and safety in demanding applications like structural frameworks and heavy machinery assembly.
Specification Summary & Compliance
This screw adheres to ASME B18.3 specifications, with precise Class 3A thread fit and UNC coarse threading for consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. Dimensions include a 4 1/2" length, 5/16"-18 thread size, and standard right-hand threading, all manufactured to meet industrial durability and precision requirements.
