S-90289A536 1/4"-20 x 7/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with serrated locking design that prevents loosening under dynamic loads
• Exceptional durability from Rockwell C45 hardened alloy steel construction for long service life
• Precise thread engagement with Class 3A fit ensuring reliable fastening in demanding applications
• Easy installation and removal through 1/8" hex drive design requiring minimal clearance
• Enhanced gripping power from cup tip design that concentrates pressure on contact surfaces
• Corrosion-resistant protection with black-oxide coating extending component lifespan
• Industry-standard compatibility with UNC coarse threads for broad application versatility

Professional Applications & Engineering Value

This 1/4"-20 UNC set screw delivers critical holding power in industrial machinery, automotive assemblies, and precision equipment where vibration resistance is paramount. The black-oxide alloy steel construction combined with Rockwell C45 hardness provides exceptional shear strength, while the serrated locking mechanism prevents rotational slippage in high-torque environments. The cup tip design creates concentrated pressure points for secure shaft positioning, and the headless configuration allows for flush mounting in space-constrained applications. Engineered for heavy-duty fastening challenges, this component maintains integrity under continuous stress cycles.

Specification Summary & Compliance

This set screw features 1/4"-20 UNC coarse threads with Class 3A thread fit for precision tolerance. Manufactured to ASME B18.3 specifications with complete compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The component measures 7/16" in length with 0.25" thread diameter and right-hand thread direction.