S-92949A859 5/16"-24 x 7/8" ASME B18.3, ASTM F879 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 from 18-8 stainless steel and passivated finish, ideal for harsh environments.
- High tensile strength of 70,000 psi ensures reliable, long-lasting fastening under significant load.
- Precise Class 3A thread fit provides excellent engagement and vibration resistance in fine-thread applications.
- Hex drive design allows for high-torque installation and removal with standard tools.
- Rounded button head profile offers a low-profile, finished appearance while reducing snagging risks.
- Full compliance with ASME B18.3 and ASTM F879 guarantees consistent quality and dimensional accuracy.
- Meets RoHS 3 and REACH standards for safe use in regulated industries and global markets.
Professional Applications & Engineering Value
This 18-8 stainless steel rounded head screw is engineered to address critical challenges in precision assembly, such as vibration loosening and corrosive wear. Its 5/16"-24 UNF fine threading and Class 3A thread fit deliver superior clamp load retention in machinery, electronics, and automotive systems where fine adjustments are essential. The hex drive ensures secure tool engagement, minimizing cam-out during high-torque applications. Combined with a passivated finish, it provides an extra layer of protection against oxidation and chemical exposure, extending service life in demanding industrial environments. This makes it a trusted precision fastener for OEMs and maintenance teams requiring dependable, repeatable performance.
Specification Summary & Compliance
This screw features a 5/16"-24 UNF fine thread with Class 3A fit for high precision, a length of 7/8", and is fully threaded. It is manufactured in accordance with ASME B18.3 and ASTM F879 specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.
