S-91385A124 5-40 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
- Vibration-resistant locking with nylon patch thread locker that maintains secure fastening from -50°F to 250°F, preventing loosening in demanding environments
- Superior corrosion protection through black-oxide coating on alloy steel, extending service life in industrial applications
- Precision thread engagement with Class 3A UNC coarse threads ensuring reliable fit and reduced cross-threading risks
- High-strength construction with Rockwell C45 hardness providing exceptional durability under heavy loads
- Space-saving headless design allowing flush mounting where clearance is limited
- Secure installation control via 1/16" hex drive that prevents tool slippage and damage
- Consistent performance meeting ASME B18.3 specifications for dimensional accuracy and reliability
Professional Applications & Engineering Value
Engineered for critical fastening applications where vibration resistance and thermal stability are paramount, this 5-40 UNC set screw solves common industrial challenges. The nylon patch thread locker embedded in the coarse UNC threads creates consistent friction that prevents back-out in machinery subjected to constant motion or temperature fluctuations from -50°F to 250°F. The black-oxide alloy steel construction combined with Rockwell C45 hardness ensures the screw maintains its integrity under high clamp loads while resisting corrosion in harsh environments. The headless design with cup tip provides maximum contact surface for secure positioning of components like gears, pulleys, and collars on shafts. These features make it ideal for precision assembly in automotive, manufacturing, and heavy equipment applications where reliability cannot be compromised.
Specification Summary & Compliance
This set screw maintains Class 3A thread fit for precise dimensional accuracy according to UNC standards. Manufacturing complies with ASME B18.3 specifications where applicable. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial components.
