S-91355A182 1/4"-20 x 2 1/2" 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 durability with 120,000 psi tensile strength and Rockwell C32 hardness for reliable performance in demanding applications.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
- Precise thread engagement with Class 3A thread fit and UNC coarse spacing, ensuring secure fastening and vibration resistance.
- Efficient installation via the 5/32" hex drive and fully threaded design, reducing assembly time and labor costs.
- Enhanced load distribution from the wide, flanged rounded head, minimizing surface damage and improving joint integrity.
- Broad compatibility with right-hand UNC threads, making it suitable for standard industrial equipment and machinery.
- Regulatory compliance with RoHS 3 and REACH standards, ensuring safe, eco-friendly use in global markets.
Professional Applications & Engineering Value
This black-oxide alloy steel rounded head screw is engineered to address critical industrial challenges, such as mechanical stress and environmental exposure. The high tensile strength of 120,000 psi and robust Class 3A thread fit provide reliable fastening in heavy-duty applications, from machinery assembly to structural frameworks. The UNC coarse thread and fully threaded design enable quick, secure installations, reducing downtime. With its flanged head and hex drive, it offers superior torque transmission and prevents loosening under vibration, making it ideal for automotive, construction, and manufacturing sectors where durability and precision are paramount.
Specification Summary & Compliance
This screw adheres to UNC thread standards with a Class 3A thread fit for precise dimensional accuracy. It features a 1/4"-20 thread size, coarse spacing, and is fully threaded for consistent performance. Manufactured from alloy steel with a black-oxide finish, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and regulatory adherence in industrial use.
