S-95289A148 5/16"-18 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and reducing maintenance costs.
• Exceptional holding power provided by the Class 3A thread fit, ensuring a tight, secure, and vibration-resistant connection.
• High-strength durability from Rockwell B80 hardness, offering reliable performance and a long service life under load.
• Easy installation and removal with the 5/32" hex drive and headless design, allowing for flush mounting in tight spaces.
• Optimized for quick assembly using coarse UNC threads, which are less prone to cross-threading and facilitate faster engagement.
• Enhanced grip and security from the extended tip design, which digs into the shaft for a more positive lock against rotation.
• Guaranteed quality and safety through compliance with ASME B18.3, RoHS 3, and REACH, ensuring material reliability and environmental standards.

Professional Applications & Engineering Value

This 5/16"-18 UNC set screw is engineered to solve critical challenges in machinery assembly and component fixation. Made from 18-8 Stainless Steel, it resists rust and corrosion, making it suitable for applications in moist or chemically aggressive settings like food processing, marine, and outdoor equipment. The Class 3A thread fit and coarse UNC thread provide a precise, high-strength engagement that minimizes loosening under vibration—common in motors, pulleys, and gear assemblies. The headless design with a hex drive allows for a flush finish, preventing interference in compact designs. The extended tip increases surface contact, improving torque transmission and preventing slippage, which is vital for securing collars, knobs, and bearings on shafts. This combination of material, thread precision, and design ensures reliable performance in demanding industrial applications, reducing downtime and maintenance needs.

Specification Summary & Compliance

This set screw adheres to strict dimensional and performance standards. The thread system is 5/16"-18 UNC with a Class 3A thread fit, ensuring high precision and interchangeability. Manufacturing and quality are governed by ASME B18.3 specifications. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial and international markets.