S-92949A883 1/2"-20 x 1 3/4" 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.
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing.
- Precise, secure fastening ensured by Class 3A thread fit and fine UNF threading, minimizing loosening.
- Easy installation and removal with a 5/16" hex drive and fully threaded design for efficient assembly.
- Low-profile, rounded button head provides a smooth finish and reduces snagging in tight spaces.
- Full regulatory compliance with ASME B18.3, ASTM F879, RoHS 3, and REACH for safe, global use.
- Consistent performance in right-hand threaded applications requiring fine thread spacing and durability.
Professional Applications & Engineering Value
This 1/2"-20 UNF rounded head screw is engineered to address critical challenges in industrial and mechanical assemblies. The 18-8 stainless steel construction, enhanced by a passivated finish, delivers outstanding resistance to corrosion and oxidation, making it suitable for marine, chemical, and outdoor applications. The Class 3A thread fit and fine thread spacing provide superior vibration resistance and sealing capabilities, essential in precision equipment, automotive components, and machinery where loosening under dynamic loads is a concern. The combination of high tensile strength and a low-profile button head ensures reliable performance in confined spaces, offering both structural integrity and a flush installation. These screws are ideal for OEMs and maintenance teams requiring durable, compliant fasteners that meet rigorous ASME and international standards.
Specification Summary & Compliance
This screw features a 1/2"-20 UNF thread with Class 3A fit and fine thread spacing, ensuring high precision and interchangeability. It is manufactured in accordance with ASME B18.3 and ASTM F879 specifications, guaranteeing dimensional accuracy and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming it is free from hazardous substances and safe for various industrial and consumer applications.
