S-92949A583 5/16"-18 x 7/8" 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 with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
- High tensile strength of 70,000 psi provides exceptional load-bearing capacity for demanding industrial applications.
- Precision Class 3A thread fit guarantees secure, vibration-resistant fastening with minimal risk of loosening.
- Hex drive design (3/16") allows for high-torque installation and easy maintenance with standard tools.
- Coarse UNC threading (5/16"-18) enables quick assembly and reduced cross-threading in coarse materials.
- Rounded button head profile offers a low-profile, finished appearance while minimizing snagging risks.
- Full compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to strict industrial safety and environmental standards.
Professional Applications & Engineering Value
This 18-8 stainless steel rounded head screw is engineered to address critical challenges in industrial assembly, where corrosion resistance and mechanical reliability are paramount. The passivated finish enhances surface durability, preventing oxidation in humid or chemical-exposed settings like marine equipment, food processing machinery, and outdoor structures. Its coarse UNC threading and Class 3A thread fit provide superior grip in soft metals or plastics, reducing installation time and preventing thread stripping. The hex drive design ensures efficient torque transfer during high-stress applications, making it ideal for heavy-duty fastening in automotive, construction, and manufacturing sectors where vibration resistance and long-term performance are essential.
Specification Summary & Compliance
This screw features a 5/16"-18 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances per ASME B18.3 specifications. It is fully threaded with a length of 7/8", head diameter of 0.547", and Rockwell B55 hardness for consistent performance. Compliance includes ASME B18.3 for dimensional standards, RoHS 3 (2015/863/EU) for restricted substance control, and REACH (EC 1907/2006) for chemical safety, meeting rigorous industrial and environmental regulations.
