S-94355A712 1/4"-28 x 5/16" ASME B18.3 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 accuracy and holding power provided by Class 3A thread fit, ensuring secure, vibration-resistant fastening.
• Optimized for high-torque applications featuring a 1/8" hex drive that prevents cam-out and allows for easy installation in confined spaces.
• Enhanced material durability with Rockwell B80 hardness, offering excellent resistance to wear and deformation under load.
• Precise fine thread engagement with 1/4"-28 UNF threads, delivering superior clamping force and minimal loosening in dynamic assemblies.
• Reliable flat tip design that maximizes surface contact for secure positioning of components on shafts and hubs.
• Full regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, globally accepted industrial use.

Professional Applications & Engineering Value

This 1/4"-28 UNF Class 3A set screw is engineered to address critical challenges in precision assembly and machinery. The 18-8 Stainless Steel material provides excellent corrosion resistance, making it suitable for applications in moist or chemically aggressive environments, such as marine equipment, food processing machinery, and outdoor industrial systems. The fine thread spacing and Class 3A thread fit ensure tight tolerances and reliable performance in high-vibration settings, preventing unintended loosening in automotive, aerospace, and robotics components. Its headless design with a hex drive allows for flush mounting and easy access in tight spaces, while the flat tip offers secure contact for positioning gears, pulleys, and couplings. By combining durability with precision engineering, this set screw delivers consistent holding power and extends service life in demanding B2B applications.

Specification Summary & Compliance

This set screw adheres to Class 3A thread fit for precise dimensional accuracy, with UNF fine threads (1/4"-28) and a thread diameter of 0.25". It is manufactured in compliance with ASME B18.3 standards, ensuring consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.