S-91385A190 8-32 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 prevents loosening under dynamic loads, maintaining secure fastening from -50°F to 250°F.
- Superior corrosion protection from black-oxide coating on alloy steel, extending service life in demanding industrial environments.
- High-strength durability with Rockwell C45 hardness, ensuring reliable performance under high torque and repetitive stress.
- Precision thread engagement through Class 3A UNC coarse threads, enabling quick installation and consistent clamping force.
- Space-saving headless design allows flush mounting in tight assemblies where protruding fasteners are impractical.
- Secure hex drive compatibility with 5/64" tools, providing slip-resistant torque application and reduced tool wear.
- Enhanced grip with cup tip concentrates pressure on small contact areas for superior shaft positioning in pulley and gear applications.
Professional Applications & Engineering Value
Engineered for precision shaft retention in machinery, automotive, and aerospace assemblies, this 8-32 UNC set screw solves critical vibration-induced failure points. The black-oxide alloy steel construction resists rust in humid or chemical-exposed environments, while the nylon patch locking element maintains clamp load without compromising thread integrity across extreme thermal cycles (-50°F to 250°F). Its coarse UNC threads and Class 3A fit enable rapid installation with reduced cross-threading risks, ideal for high-volume production lines. The headless hex drive design ensures unobstructed rotation in collars, couplings, and knobs where space optimization is paramount.
Specification Summary & Compliance
This set screw adheres to ASME B18.3 dimensional standards with UNC coarse threads in Class 3A fit for precision tolerance. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring hazardous substance restriction alignment. The Rockwell C45 hardness and black-oxide surface treatment meet industrial durability requirements for repeated use.
