S-92785A439 1/4"-20 x 3/4" 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.
• Exceptional holding power provided by the 90° cone point, which bites into the shaft for a secure, non-slip connection.
• Precise and reliable fit due to the Class 3A thread fit, ensuring minimal backlash and consistent performance in assemblies.
• High mechanical strength and durability from a Rockwell B80 hardness, resisting wear and deformation under load.
• Easy installation and removal with the internal 1/8" hex drive, allowing for a flush, headless design in space-constrained applications.
• Broad compatibility with the standard 1/4"-20 UNC coarse thread, making it a versatile choice for various machinery and equipment.
• Guaranteed quality and safety through compliance with ASME B18.3, RoHS 3, and REACH regulations.

Professional Applications & Engineering Value

This hex headless set screw is engineered to solve critical challenges in power transmission and motion control systems. Its 18-8 stainless steel material offers excellent resistance to rust and oxidation, which is vital for maintaining integrity in moist or chemically aggressive settings. The 90° cone point and Class 3A thread fit work in tandem to create a firm, vibration-resistant lock on pulleys, gears, and collars, preventing axial movement without damaging the shaft. The headless design with a 1/8" hex drive ensures a clean, flush finish, making it perfect for applications where protruding fastener heads are not feasible. Commonly used in industrial machinery, automotive assemblies, and precision instruments, this UNC thread set screw delivers reliable performance where secure component positioning is non-negotiable.

Specification Summary & Compliance

This set screw features a 1/4"-20 UNC coarse thread with a Class 3A thread fit for precise dimensional accuracy. It is manufactured in compliance with the ASME B18.3 standard and is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for industrial use.