S-92949A103 4-40 x 1/8" 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 and passivated finish for long-lasting performance in harsh environments.
- High-strength reliability with 70,000 psi tensile strength and Rockwell B55 hardness to withstand significant mechanical stress.
- Precise, secure fastening thanks to Class 3A thread fit and UNC coarse threads, ensuring vibration resistance and easy assembly.
- Efficient installation and removal with the 1/16" hex drive, providing excellent torque transfer and reduced tool slippage.
- Compact, low-profile design from the rounded button head and 1/8" length, ideal for applications with limited space.
- Regulatory peace of mind by meeting ASME B18.3 standards and being fully RoHS 3 and REACH compliant.
- Versatile fully threaded shank for maximum grip and holding power across a wide range of material thicknesses.
Professional Applications & Engineering Value
These 4-40 UNC rounded head screws are engineered to solve common industrial fastening challenges, such as corrosion-induced failure and assembly inefficiency. The 18-8 stainless steel construction, enhanced by a passivated finish, provides exceptional resistance to rust and chemicals, making them ideal for electronics, machinery, and outdoor equipment. The hex drive design ensures high torque application without cam-out, reducing installation time and tool wear. With a coarse thread and Class 3A fit, they offer quick engagement and reliable performance in metals and plastics, minimizing the risk of loosening under vibration. This combination of durability and precision supports critical applications in automotive, aerospace, and consumer goods manufacturing.
Specification Summary & Compliance
This screw features a 4-40 UNC thread with Class 3A precision fit and coarse thread spacing for consistent performance. It adheres to ASME B18.3 manufacturing specifications, ensuring dimensional accuracy and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for various industrial and consumer applications.
