S-92949A106 4-40 x 1/4" 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-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for dependable load-bearing in demanding applications.
- Precise, secure fastening with Class 3A thread fit and UNC coarse thread spacing, reducing cross-threading and ensuring consistent engagement.
- Efficient installation and removal thanks to the 1/16" hex drive and rounded button head design, allowing quick access in confined spaces.
- Full thread coverage along the 1/4" length provides maximum grip and uniform stress distribution across joined materials.
- Compliance with industry standards including ASME B18.3, ensuring dimensional accuracy and interchangeability in mechanical assemblies.
- Environmentally safe usage with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substance restrictions.
Professional Applications & Engineering Value
This 4-40 UNC threaded rounded head screw is engineered to address common industrial challenges such as vibration loosening, corrosion-induced failure, and assembly time inefficiencies. The 18-8 stainless steel material, combined with a passivated finish, provides exceptional resistance to oxidation and chemical exposure, making it ideal for electronics enclosures, machinery panels, and outdoor equipment. The coarse thread spacing and Class 3A thread fit enhance durability in high-vibration settings, while the hex drive and button head profile facilitate tool access in compact designs. These features ensure reduced maintenance cycles and enhanced operational safety in industrial fastening applications.
Specification Summary & Compliance
This screw adheres to ASME B18.3 specifications, with precise Class 3A thread fit and UNC coarse thread standards for consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no restricted substances are used. Dimensions include a 1/4" length, 0.213" head diameter, and right-hand thread direction, supporting reliable integration in qualified assemblies.
