S-91385A546 1/4"-20 x 1 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
- Vibration-resistant locking with nylon patch thread locker maintains secure fastening from -50°F to 250°F, preventing loosening in dynamic industrial environments
- Superior corrosion protection through black-oxide coating on alloy steel extends service life in demanding applications
- Precise Class 3A thread fit ensures excellent engagement and consistent clamping force for reliable component positioning
- Exceptional hardness at Rockwell C45 provides outstanding wear resistance and durability under heavy loads
- Headless hex drive design allows flush mounting in confined spaces while enabling high torque application
- Cup tip configuration creates positive seating and minimizes surface damage to secured components
- UNC coarse threading enables quick installation and superior resistance to cross-threading
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers critical engineering solutions for industrial applications requiring permanent component positioning. The combination of Class 3A UNC coarse threads and nylon patch thread locking technology addresses common vibration-induced loosening in machinery, automotive assemblies, and power transmission systems. The headless hex drive design provides space-saving installation while maintaining high torque capability, making it ideal for collars, gears, and pulleys where flush mounting is essential. The cup tip ensures positive contact without excessive surface penetration, protecting expensive components from damage while maintaining secure positioning under rotational forces and shock loads.
Specification Summary & Compliance
Manufactured to exact Class 3A thread fit tolerances with UNC coarse threading (1/4"-20) and 1-1/2" length. Complies with ASME B18.3 specifications where identified per ASTM F912. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for environmental regulations. Features Rockwell C45 hardness rating and black-oxide surface treatment for enhanced corrosion resistance.
