S-92949A116 4-40 x 1" 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, ideal for harsh industrial environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
- Precision thread engagement through Class 3A thread fit and UNC coarse threading, ensuring secure fastening and vibration resistance
- Easy installation and removal with hex drive (1/16") and rounded button head design, reducing assembly time and tool slippage
- Full threading along the 1" length provides maximum grip and uniform stress distribution in deep or variable material applications
- Compliance with major standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety
- Right-hand thread with coarse spacing enables quick assembly and disassembly in high-volume production settings
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 4-40 UNC thread stainless steel rounded head screws address critical challenges in precision assembly. The 18-8 stainless steel material combined with a passivated finish significantly enhances corrosion resistance, making them suitable for electronics, machinery, and outdoor equipment where moisture and chemicals are present. The Class 3A thread fit and coarse thread spacing ensure tight tolerances and reduce the risk of cross-threading, while the hex drive and button head design facilitate secure tool engagement in confined spaces. These features collectively improve assembly efficiency, minimize fastener failure, and extend service life in high-stress environments.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit per UNC standards, ensuring precise dimensional accuracy. It meets ASME B18.3 specifications for consistency and reliability. Additionally, the product is RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, confirming adherence to environmental and safety regulations without hazardous substances.
