S-90289A559 1/4"-28 x 1/2" 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 for extended service life in harsh industrial environments
- Precise thread engagement with Class 3A fit ensuring reliable, vibration-resistant fastening in critical assemblies
- Exceptional hardness at Rockwell C45 providing excellent wear resistance and reduced thread deformation
- Secure locking capability through serrations that prevent loosening under dynamic loads and vibration
- Space-saving headless design allowing flush mounting where clearance is limited
- Easy installation and removal with 1/8" hex drive accommodating standard tools for efficient maintenance
- Enhanced grip from cup tip design that digs into surfaces for superior torque transmission
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers exceptional performance in demanding industrial applications where precision and reliability are paramount. The 1/4"-28 UNF fine threads with Class 3A fit provide superior engagement in precision machinery, automotive components, and aerospace assemblies, eliminating backlash and maintaining alignment under vibration. The headless design with hex drive solves space constraints in compact assemblies while the serrations and cup tip create permanent positioning in shafts, collars, and pulleys. Engineered to withstand high torque applications, this fastener prevents accidental disassembly in rotating equipment, ensuring operational safety and reducing maintenance downtime across manufacturing, robotics, and heavy equipment sectors.
Specification Summary & Compliance
This set screw features 1/4"-28 UNF fine threads with Class 3A precision tolerance for exacting fit requirements. Manufacturing complies with ASME B18.3 specifications ensuring dimensional accuracy and performance reliability. The product is fully RoHS 3 (2015/863/EU) compliant and meets REACH (EC 1907/2006) requirements, confirming environmental responsibility and regulatory adherence for global industrial applications.
