S-91385A173 1/2"-20 x 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 permanent Nylon Patch thread locker prevents loosening under dynamic loads
- Exceptional temperature tolerance maintains secure fastening from -50°F to 250°F in demanding environments
- Precision Class 3A thread fit ensures superior engagement and consistent clamping force in critical assemblies
- Enhanced corrosion protection through Black-Oxide coating on alloy steel substrate
- High-strength performance with Rockwell C45 hardness for reliable load-bearing capability
- Space-saving headless design with 1/4" hex drive enables installation in confined spaces
- Cup tip configuration provides positive seating and minimal surface damage during installation
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel set screw delivers critical vibration resistance in precision machinery, automotive components, and industrial equipment where UNF fine threads and reliable locking are paramount. The Nylon Patch locking technology eliminates the need for secondary locking devices, reducing assembly time while providing permanent resistance to rotational forces. Engineered with Class 3A thread fit, this fastener ensures precise engagement in high-vibration applications where maintaining positional accuracy is essential. The headless hex drive design allows for flush mounting in space-constrained assemblies while the cup tip creates secure contact points without excessive surface deformation, making it ideal for shaft collars, gears, and precision positioning systems requiring repeated adjustments.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread tolerance for precision fit. Features 1/2"-20 UNF fine threads with right-hand direction and 1/2" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Meets ASTM F912 specifications for locking elements, ensuring consistent performance across industrial applications.
