S-91385A106 4-40 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
- Secure vibration-resistant locking with nylon patch thread locker that maintains integrity from -50°F to 250°F, preventing loosening in dynamic industrial environments
- Superior corrosion resistance through black-oxide coating on alloy steel, extending service life in demanding applications
- Precise thread engagement with Class 3A fit UNC coarse threads ensuring reliable fastening and consistent performance
- High-strength construction with Rockwell C45 hardness providing excellent durability and resistance to wear
- Space-saving headless design with hex drive allows flush mounting in confined spaces while enabling sufficient torque application
- Enhanced grip capability with cup tip design that digs into mating surfaces for superior holding power
- Industry-standard compatibility with 4-40 UNC thread size and 1/4" length meeting common engineering specifications
Professional Applications & Engineering Value
This 4-40 UNC set screw delivers exceptional engineering value for industrial applications where vibration resistance and reliable positioning are critical. The black-oxide alloy steel construction combined with Rockwell C45 hardness ensures long-term durability in mechanical assemblies, while the nylon patch thread locker provides maintenance-free security against loosening from machinery vibrations. The headless design with hex drive offers optimal space utilization in precision equipment, and the cup tip creates positive engagement with shaft surfaces. Ideal for securing collars, gears, and pulleys in manufacturing equipment, automotive systems, and industrial machinery where UNC coarse threads facilitate quick assembly and disassembly.
Specification Summary & Compliance
This set screw features precise Class 3A thread fit with 4-40 UNC coarse threads and 1/4" length for accurate installation. Manufactured to ASME B18.3 specifications with hex drive 0.050" for consistent torque application. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The right-hand thread direction and standardized dimensions provide compatibility with existing industrial components and assembly processes.
