S-91375A104 3-48 x 5/32" 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 coating, extending service life in demanding industrial environments
- Exceptional thread engagement with Class 3A fit ensuring precise, vibration-resistant fastening in critical assemblies
- High-strength durability from Rockwell C45 hardened alloy steel, maintaining clamping force under heavy loads
- Secure installation with hex drive design preventing cam-out and enabling high torque application
- Optimized cup tip design creating positive seating and minimal surface damage on shaft components
- Reliable coarse threading (UNC) providing faster installation and reduced cross-threading risks
- Compact headless profile allowing flush mounting in space-constrained applications
Professional Applications & Engineering Value
This 3-48 UNC set screw delivers critical engineering solutions for precision industrial applications where vibration resistance and permanent positioning are paramount. The black-oxide alloy steel construction provides essential corrosion protection while maintaining the Rockwell C45 hardness needed to prevent deformation under cyclic loading. The cup tip design concentrates clamping force into a small contact area, creating secure shaft locking without excessive surface marring. With its Class 3A thread fit and coarse UNC threading, this fastener ensures rapid installation in production environments while maintaining precise alignment in pulleys, gears, and collars. The hex drive configuration enables reliable torque transmission in automated assembly systems, making it ideal for machinery, automotive components, and precision instruments requiring dependable set screw performance.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit tolerance for precision engagement. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features UNC coarse threads with 3-48 thread size, 0.099" diameter, and 5/32" length in inch measurement system. Black-oxide surface treatment on alloy steel substrate with Rockwell C45 hardness rating.
