S-92949A844 1/4"-28 x 1 1/8" 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 with 18-8 Stainless Steel and passivated finish, ideal for harsh environments and extending service life.
- High-strength fastening offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under stress.
- Precise thread engagement with Class 3A UNF fine threads, ensuring secure, vibration-resistant connections and reducing loosening risks.
- Easy installation and removal using a standard 5/32" hex drive, providing a firm grip and minimizing tool slippage.
- Full-threaded design for maximum grip along the entire 1-1/8" length, enhancing load distribution and joint integrity.
- Rounded button head profile that offers a low-profile, aesthetically pleasing finish while reducing snagging in assembled products.
- Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.
Professional Applications & Engineering Value
This 18-8 Stainless Steel Rounded Head Hex Screw is engineered to address critical challenges in industrial and precision assemblies. Its passivated finish significantly enhances corrosion resistance, making it suitable for applications exposed to moisture, chemicals, or outdoor conditions, such as marine equipment, food processing machinery, and electronic enclosures. The UNF fine thread with Class 3A fit provides tight tolerances that prevent back-off in high-vibration environments, common in automotive, aerospace, and heavy machinery. The combination of 70,000 psi tensile strength and a rounded head design ensures durable, reliable fastening without sharp edges, improving safety and longevity in demanding B2B settings.
Specification Summary & Compliance
This screw features precise Class 3A thread fit and UNF fine threading (1/4"-28) with a length of 1-1/8", manufactured to ASME B18.3 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and meets environmental standards for global industrial use.
