S-91375A112 4-40 x 5/8" 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 for extended service life in demanding industrial environments
- Exceptional holding power from Class 3A thread fit ensuring secure, vibration-resistant fastening in precision assemblies
- Optimized torque transmission through 0.050" hex drive design for reliable installation without stripping
- Enhanced material durability with Rockwell C45 hardness providing consistent performance under mechanical stress
- Secure component positioning using cup tip design that creates positive engagement with mating surfaces
- Space-saving installation through headless construction ideal for confined spaces and flush-mount applications
- Industry-standard compatibility with 4-40 UNC coarse threads ensuring interchangeability across equipment and fixtures
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers critical engineering solutions for industrial applications where vibration resistance and space constraints are primary concerns. The 4-40 UNC coarse thread configuration combined with Class 3A thread fit provides exceptional clamping force retention in pulleys, gears, and collars, preventing loosening under dynamic loads. The headless design with hex drive enables installation in recessed locations while maintaining full torque capability. The cup tip creates concentrated contact pressure for secure shaft positioning in precision machinery, automotive components, and electronic enclosures. With Rockwell C45 hardness, this fastener maintains dimensional stability and thread integrity through repeated adjustment cycles, making it ideal for permanent and semi-permanent industrial fastening applications.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread tolerance for precision fit. Features 4-40 UNC coarse threads with right-hand direction and 5/8" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The black-oxide alloy steel construction meets ASTM F912 requirements for consistent performance in industrial applications.
