S-95289A149 5/16"-18 x 5/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments.
• Superior vibration resistance and holding power with Class 3A thread fit and coarse UNC threads for a secure, reliable fastening.
• High-strength durability with a Rockwell B80 hardness rating, ensuring the screw withstands heavy-duty use without deforming.
• Deep, positive engagement provided by the extended tip design for enhanced grip and resistance to loosening.
• Easy and secure installation using a standard 5/32" hex key, facilitated by the headless design for applications with space constraints.
• Guaranteed dimensional consistency and performance reliability through compliance with the stringent ASME B18.3 standard.
• Safe for use in regulated industries as it is fully compliant with RoHS 3 and REACH environmental regulations.

Professional Applications & Engineering Value

This 5/16"-18 UNC set screw is engineered to solve critical challenges in industrial assembly and machinery. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making it suitable for demanding environments like manufacturing, automotive, and outdoor equipment. Its Class 3A thread fit and coarse threads ensure a tight, secure fit that resists loosening under vibration, a common failure point in dynamic systems. The extended tip increases the bearing surface area, providing superior holding power in pulleys, gears, and collars. The headless design with a hex drive allows for flush mounting in confined spaces, offering a clean and safe installation. This combination of features delivers reliable, long-term performance for precision set screw applications.

Specification Summary & Compliance

This set screw adheres to precise dimensional standards, featuring a 5/16"-18 UNC thread with a Class 3A precision fit for optimal thread engagement. The extended tip maintains tight tolerances (Tip Length: -0.005" to 0", Tip Diameter: -0.008" to 0"). It is manufactured in compliance with the ASME B18.3 specification and is certified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets rigorous industry and environmental safety standards.