S-91381A379 1/2"-20 x 3/4" ASME B18.3 Set Screws
Set Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Precise thread engagement with Class 3A UNF fine threads ensuring reliable, vibration-resistant fastening
- Damage-free component protection through brass soft tip design that prevents marring of mating surfaces
- Exceptional mechanical strength with Rockwell C28 hardness alloy steel construction for heavy-duty applications
- Secure installation and removal via 1/4" hex drive that provides positive tool engagement without slippage
- Space-saving headless design enabling flush mounting in confined spaces and rotating assemblies
- Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations (RoHS 3/REACH)
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers critical engineering solutions for precision industrial applications where component positioning and rotational security are paramount. The combination of Class 3A UNF fine threads provides superior resistance to vibrational loosening in machinery, automotive, and aerospace assemblies. The brass soft tip offers dual benefits: preventing damage to expensive shafts and components while maintaining consistent clamping force without surface deformation. The headless design with 1/4" hex drive enables installation in space-constrained applications where traditional fasteners cannot be used. Engineered for corrosion-resistant performance, these set screws maintain integrity in environments exposed to moisture, chemicals, and temperature variations, making them ideal for permanent installations requiring long-term reliability.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit for precision tolerance. Features 1/2"-20 UNF fine threads with right-hand direction and 0.5" thread diameter. Constructed from alloy steel with Rockwell C28 hardness and measures 3/4" in length with 0.125" brass tip. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets.
