S-90289A753 1/2"-20 x 7/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in demanding environments
• Precise thread engagement with Class 3A fit ensuring reliable, vibration-resistant connections
• Maximum torque transmission through 1/4" hex drive design for secure installation and removal
• Enhanced locking capability with serrations providing superior resistance to loosening under vibration
• Optimized material strength with Rockwell C45 hardness for heavy-duty applications
• Secure component positioning with cup tip design distributing pressure evenly
• Industry-standard compliance meeting ASME B18.3 specifications for guaranteed performance

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional performance in precision machinery, automotive assemblies, and industrial equipment where vibration resistance and reliable positioning are critical. The Class 3A thread fit provides tighter tolerances than standard fasteners, ensuring minimal backlash in high-precision applications. The fine UNF threads (1/2"-20) offer superior load distribution, while the serrations locking feature prevents rotational slippage in dynamic environments. The headless design allows for flush mounting in space-constrained assemblies, making it ideal for shafts, collars, and gear applications where protruding fasteners are impractical.

Specification Summary & Compliance

Manufactured to ASME B18.3 standards with Class 3A thread fit precision, this set screw features 1/2"-20 UNF fine threads with right-hand direction. The component is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental regulations. The Rockwell C45 hardness rating ensures consistent performance under mechanical stress, while the black-oxide surface treatment provides additional corrosion protection for industrial applications.