S-90289A191 8-32 x 5/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Enhanced Durability – Black-oxide alloy steel construction with Rockwell C45 hardness provides superior resistance to wear and corrosion in demanding industrial environments.
• Secure Locking Performance – Serrations and cup tip design ensure excellent grip and prevent loosening under vibration, maintaining reliable component positioning.
• Precise Thread Fit – Class 3A thread fit guarantees tight tolerances and smooth assembly, reducing the risk of cross-threading and improving installation efficiency.
• Easy Installation & Removal – Hex drive (5/64") allows for straightforward torque application with standard tools, minimizing downtime during maintenance or adjustments.
• High-Strength Fastening – Coarse UNC 8-32 threads and right-hand direction deliver strong holding power for heavy-duty applications requiring robust set screw performance.
• Headless Design Advantage – Flush mounting capability saves space and provides a clean finish, ideal for assemblies where protruding fastener heads are not feasible.
• Regulatory Compliance Assurance – Meets ASME B18.3 specifications and is RoHS 3/REACH compliant, ensuring safety and environmental standards are upheld.

Professional Applications & Engineering Value

This 8-32 UNC set screw is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and space constraints. The black-oxide alloy steel material, combined with a Rockwell C45 hardness, offers exceptional durability against mechanical stress and environmental factors. Its headless design and cup tip with serrations provide secure locking without protruding components, making it ideal for precision machinery, automotive assemblies, and electronic enclosures. The hex drive ensures easy installation in tight spaces, while the coarse thread and Class 3A fit enhance grip strength in high-vibration settings, reducing maintenance needs and improving operational reliability.

Specification Summary & Compliance

This set screw features precise UNC 8-32 coarse threads with a Class 3A fit for accurate engagement and consistent performance. It adheres to ASME B18.3 manufacturing standards, ensuring dimensional reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in regulated industries.