S-90289A584 5/16"-18 x 1" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
• Exceptional locking security provided by serrations that bite into mating surfaces, preventing loosening under vibration.
• High-strength performance from alloy steel and Rockwell C45 hardness, ensuring reliable, long-term fastening integrity.
• Precise thread engagement with UNC Class 3A fit, offering tighter tolerances for secure assemblies in high-stress applications.
• Easy installation and removal using a standard 5/32" hex key, saving time and reducing tooling complexity.
• Effective torque transmission from the headless, hex drive design, ideal for confined spaces and flush mounting requirements.
• Broad material compatibility with the cup point tip, which creates a strong indent for secure positioning on shafts and collars.

Professional Applications & Engineering Value

Engineered for critical industrial set screws applications, these black-oxide alloy steel fasteners address common challenges like component slippage and vibrational loosening. The UNC coarse thread and Class 3A precision ensure rapid assembly and high clamp load retention in pulleys, gears, and knobs. The hex drive and headless design facilitate installation in tight spaces, while the serrations and cup point provide immediate, non-slip locking. Ideal for machinery, automotive, and heavy equipment, they deliver consistent performance where high hardness and reliable locking are paramount.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, with UNC 5/16"-18 coarse threads and a Class 3A thread fit for precise dimensional accuracy. It is manufactured from alloy steel with a black-oxide finish and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental and safety standards for global industrial use.