S-91355A181 1/4"-20 x 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 tensile strength of 120,000 PSI for reliable performance in demanding applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending the screw's service life in various industrial environments.
- Precise Class 3A thread fit ensures tighter tolerances and more secure fastening compared to standard fits, minimizing loosening under vibration.
- Convenient hex drive (5/32") allows for easy installation and high torque application with standard tools, speeding up assembly processes.
- Integrated flange on the rounded button head distributes clamping force over a wider area, reducing surface damage and providing a finished look.
- Fully threaded design offers maximum grip along the entire 2" length, enhancing holding power in a variety of material thicknesses.
- Compliance with RoHS 3 and REACH regulations ensures the screw meets strict environmental and safety standards for global industrial use.
Professional Applications & Engineering Value
This black-oxide alloy steel rounded head screw is engineered to address common challenges in heavy-duty assembly, such as joint integrity under stress and corrosion in harsh conditions. The UNC coarse thread and Class 3A fit provide excellent engagement in metals and plastics, resisting vibration-induced loosening in machinery, automotive, and construction applications. The combination of high tensile strength (120,000 PSI) and Rockwell C32 hardness ensures durability, while the flanged button head offers a low-profile, aesthetically pleasing finish that eliminates the need for a separate washer. Ideal for securing components where reliability and compliance with industrial standards are critical.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC coarse thread with a Class 3A thread fit for precision, a length of 2", and is fully threaded. It is manufactured from alloy steel with a black-oxide surface treatment and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, ensuring suitability for regulated industrial and engineering applications.
