S-91355A155 4-40 x 3/8" Steel Flanged Button Head Hex-Drive Screws
Steel Flanged 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 tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in demanding industrial environments.
- Class 3A thread fit offers superior precision and tighter tolerances for secure, vibration-resistant connections.
- Flanged design with a wide rounded head distributes clamping force evenly, minimizing surface damage and improving assembly stability.
- Hex drive (1/16") allows for easy installation and removal with standard tools, speeding up maintenance and reducing labor time.
- Fully threaded UNC coarse thread enables quick engagement and strong holding power in various materials.
- Compliance with RoHS 3 and REACH regulations ensures environmental safety and meets global standards for industrial use.
Professional Applications & Engineering Value
Engineered for precision and durability, these 4-40 UNC Class 3A rounded head screws are ideal for applications requiring high-strength fastening, such as machinery assembly, electronics enclosures, and automotive components. The black-oxide alloy steel construction resists rust and wear, while the Rockwell C32 hardness ensures long-term reliability under repetitive stress. The flanged design eliminates the need for separate washers, simplifying inventory and reducing installation time. With a coarse thread and fully threaded body, they provide rapid insertion and robust grip in coarse-grained materials, addressing common issues like loosening and misalignment in industrial fasteners.
Specification Summary & Compliance
This screw adheres to UNC thread standards with a Class 3A fit for precise threading and consistent performance. Dimensions include a 3/8" length, 0.234" flange diameter, and right-hand thread direction. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for regulated industries.
