S-91318A713 1/2"-20 x 1/4" Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and long-term reliability.
• Exceptional thread precision with Class 3A fit, ensuring tight, secure fastening and reduced risk of loosening under vibration.
• High mechanical strength from Rockwell B80 hardness, providing excellent durability and resistance to wear.
• Secure installation using a 1/4" hex drive, allowing for high torque application without head protrusion in compact spaces.
• Fine thread spacing for improved adjustment accuracy and better load distribution in precision assemblies.
• Right-hand thread design for standard, intuitive installation and removal in most industrial applications.
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safe use in regulated markets.

Professional Applications & Engineering Value

This hex headless set screw is engineered to address critical challenges in precision machinery and industrial equipment where space constraints and vibration resistance are paramount. The 18-8 Stainless Steel material offers excellent corrosion resistance, reducing maintenance needs in humid or chemically aggressive environments. With a Class 3A thread fit and fine UNF thread, it ensures minimal backlash and reliable positioning in applications like shaft collars, gears, and couplings. The headless design allows for flush mounting, preventing interference in compact assemblies, while the 1/4" hex drive facilitates secure tightening. Ideal for industrial set screws used in automotive, aerospace, and manufacturing sectors, this fastener delivers consistent performance where precision and durability are non-negotiable.

Specification Summary & Compliance

This set screw adheres to UNF fine thread standards with a Class 3A thread fit for high precision and tight tolerances. Key dimensions include a 1/2"-20 thread size, 1/4" length, and 0.5" thread diameter. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial use. Manufactured to consistent quality standards, it supports reliable performance in demanding applications.