S-90669A533 1/4"-20 x 1/4" 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
• Precise, secure fastening ensured by Class 3A thread fit, minimizing loosening under vibration
• Enhanced component protection with soft brass tip, preventing damage to mating surfaces during installation
• High durability and strength from Rockwell B80 hardness, providing reliable long-term performance
• Easy installation and removal using 1/8" hex drive, suitable for confined spaces due to headless design
• Broad compatibility with UNC coarse 1/4"-20 threads, fitting standard industrial applications
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for safe global use

Professional Applications & Engineering Value

This 1/4"-20 UNC hex headless set screw is engineered to address critical fastening challenges in precision assemblies. The 18-8 stainless steel material offers excellent resistance to rust and corrosion, making it suitable for demanding environments like machinery, automotive, and electronics. The Class 3A thread fit provides tighter tolerances than standard options, reducing the risk of backlash in high-vibration applications. Its headless design with hex drive allows for flush mounting in tight spaces, while the soft brass tip protects shaft surfaces from scoring during clamping. This combination ensures reliable positioning of components on shafts, hubs, and collars, enhancing overall assembly integrity and reducing maintenance needs.

Specification Summary & Compliance

This set screw features a 1/4"-20 UNC coarse thread with Class 3A fit for precise engagement, right-hand thread direction, and dimensions including 1/4" length and 1/8" tip diameter. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory adherence for industrial use.