S-90778A401 1/4"-20 x 1/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life
• Maximum holding power and thread reliability from the Class 3A thread fit, ensuring precise, vibration-resistant assemblies
• High torque transmission and easy installation via the 1/8" hex drive, allowing for secure tightening in confined spaces
• Secure fastening and minimal component movement thanks to the cone point with 118° angle, providing excellent bite and alignment
• Enhanced durability and material strength with a Rockwell B80 hardness, resisting deformation under load
• Broad industrial compatibility with UNC coarse threads, facilitating quick assembly and disassembly
• Regulatory peace of mind through compliance with ASME B18.3, RoHS 3, and REACH standards

Professional Applications & Engineering Value

This 316 stainless steel set screw is engineered to solve critical challenges in industrial fastening, such as loosening under vibration and corrosion in aggressive environments. Its Class 3A UNC thread and cone point design ensure a tight, reliable grip on shafts, collars, and pulleys, preventing slippage in high-torque applications like machinery, automotive, and marine equipment. The hex headless style and coarse thread enable efficient installation in tight spaces, while the Rockwell B80 hardness provides the necessary toughness for repeated use. Ideal for OEM and MRO needs, it delivers consistent performance where precision and durability are paramount.

Specification Summary & Compliance

This set screw adheres to precise dimensional standards, including a 1/4"-20 UNC Class 3A thread with coarse spacing for reliable fit. It meets ASME B18.3 specifications for quality and performance, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial applications.