S-92949A813 4-40 x 1 3/8" 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
- Exceptional corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments.
- High tensile strength of 70,000 PSI ensures reliable, long-lasting fastening under demanding loads.
- Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies.
- Hex drive design (1/16") allows for easy installation and high torque application without stripping.
- Rounded button head profile offers a low-profile, aesthetically pleasing finish that reduces snagging.
- Full threading along the 1 3/8" length enables consistent clamping force across the entire fastener.
- Compliance with ASME B18.3 and ASTM F879 guarantees consistent quality and interchangeability.
Professional Applications & Engineering Value
These 4-40 UNC thread rounded head screws are engineered to address common industrial fastening challenges, such as corrosion-induced failure and loosening under vibration. The 18-8 stainless steel construction, combined with a passivated finish, provides outstanding resistance to rust and chemicals, making them suitable for applications in electronics, machinery, and outdoor equipment. The coarse thread spacing and Class 3A thread fit ensure quick assembly and secure holding in materials like metals and plastics, reducing the risk of cross-threading. With a Rockwell B55 hardness and 70,000 PSI tensile strength, these hex drive screws deliver dependable performance in high-stress environments, minimizing maintenance and replacement costs.
Specification Summary & Compliance
This product adheres to Class 3A thread fit and UNC coarse thread standards for precise dimensional accuracy. It meets ASME B18.3 and ASTM F879 manufacturing specifications, ensuring consistent quality. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in global supply chains.
