S-91375A118 4-48 x 1/2" 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 Black-Oxide finish, extending service life in demanding industrial environments.
- Exceptional holding power due to Class 3A thread fit, ensuring reliable, vibration-resistant fastening in precision assemblies.
- High-strength durability from Alloy Steel with Rockwell C45 hardness, providing robust performance under mechanical stress.
- Easy installation and removal with the 0.050" hex drive, allowing for efficient tool access in confined, headless applications.
- Secure component positioning thanks to the cup tip design, which minimizes surface damage and increases grip on shafts or hubs.
- Fine thread spacing (UNF) for improved adjustment accuracy and superior load distribution in right-hand threaded applications.
- Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
Professional Applications & Engineering Value
This 4-48 UNF Class 3A set screw is engineered to address common challenges in precision machinery and assembly lines, where vibration loosening and component slippage can lead to downtime. Crafted from Black-Oxide Alloy Steel, it offers enhanced resistance to rust and wear, making it ideal for automotive, aerospace, and electronic enclosures. The fine thread and cup tip work together to provide a firm grip on rotating parts like gears and pulleys, reducing the need for frequent retightening. Its headless hex drive design allows for flush mounting in tight spaces, ensuring a clean profile while maintaining high Rockwell C45 hardness for long-term reliability in high-stress applications.
Specification Summary & Compliance
This set screw adheres to precise Class 3A thread fit tolerances per UNF standards, with a thread size of 4-48 and fine spacing for accurate engagement. It meets ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.
