S-91375A825 1/4"-20 x 1/4" ASME B18.3, ASTM F912 Set Screws
Set 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 zinc plating that protects against rust and extends service life in harsh industrial environments
- Maximum holding power ensured by Class 3A thread fit, providing tighter tolerances and more secure fastening than standard fits
- High-strength durability from alloy steel with Rockwell C45 hardness, resisting wear and deformation under heavy loads
- Space-saving installation with headless hex drive design, ideal for applications with limited clearance
- Reliable engagement using a cup tip that bites into surfaces to prevent loosening from vibration or rotation
- Easy installation and removal with a 1/8" hex drive, allowing for quick assembly using standard tools
- Broad compatibility with UNC coarse threads and right-hand direction, fitting common industrial components
Professional Applications & Engineering Value
This 1/4"-20 UNC set screw is engineered to address critical challenges in industrial assembly, such as component slippage and corrosion-induced failure. Constructed from zinc plated alloy steel, it offers enhanced protection against moisture and chemicals, reducing maintenance needs in machinery, automotive, and electrical enclosures. The headless hex drive and cup tip design allow for flush mounting and secure gripping on shafts, pulleys, and collars, preventing unintended movement under dynamic loads. With coarse thread spacing and Class 3A thread fit, it ensures rapid installation and high clamping force, making it a reliable choice for heavy-duty set screws in demanding applications.
Specification Summary & Compliance
This set screw adheres to precise dimensional standards, including 1/4"-20 UNC thread size with Class 3A thread fit for superior accuracy. It meets ASME B18.3 specifications for consistency and performance, and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. The right-hand thread direction and coarse thread spacing align with industry norms, facilitating easy integration into various assemblies.
