S-91318A712 1/2"-13 x 1/4" Set Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash in critical assemblies
• High durability backed by Rockwell B80 hardness for reliable performance under repeated use
• Easy installation and removal with a 1/4" hex drive, providing superior torque transfer without head protrusion
• Optimized for high-vibration applications through coarse UNC threading and right-hand direction
• Environmental compliance with RoHS 3 and REACH standards, meeting global regulatory requirements
• Space-saving headless design allows for flush mounting in compact or restricted-access assemblies

Professional Applications & Engineering Value

This hex headless set screw is engineered to address common challenges in precision machinery, automotive, and aerospace components where vibration resistance and corrosion prevention are critical. The 18-8 stainless steel material provides long-term reliability in humid or chemically aggressive settings, while the coarse UNC thread and Class 3A fit reduce the risk of loosening under dynamic loads. Its headless configuration is particularly valuable in applications requiring a smooth surface profile, such as shaft collars, gears, and coupling retention. By combining high Rockwell B80 hardness with standardized 1/2"-13 thread size, this fastener delivers consistent clamping force and alignment accuracy, minimizing maintenance needs in industrial set screw applications.

Specification Summary & Compliance

This set screw adheres to UNC coarse thread standards with a Class 3A thread fit for superior dimensional accuracy. Manufactured to precise specifications including a 1/2"-13 thread size, 1/4" length, and 1/4" hex drive. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries.