S-92158A121 4-40 x 3/16" 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
• Precise and secure fastening ensured by the Class 3A thread fit, providing excellent dimensional accuracy and vibration resistance
• High mechanical strength with a Rockwell B80 hardness rating, offering reliable performance under load
• Easy installation and removal with the hex drive (0.050") design, allowing for efficient assembly and maintenance
• Optimal grip and holding power from the flat tip and coarse UNC thread, preventing component slippage
• Space-saving headless design for applications where a low profile is required without compromising on function
• Compliance with major industry standards including ASME B18.3, ensuring quality and interoperability

Professional Applications & Engineering Value

This 4-40 UNC set screw is engineered to address critical challenges in precision assembly and machinery. The 316 stainless steel material provides exceptional resistance to corrosion from chemicals, moisture, and salt spray, making it a top choice for marine, chemical processing, and food industry equipment. Its Class 3A thread fit and coarse thread spacing deliver superior clamping force and vibration resistance, preventing loosening in dynamic applications. The hex drive design ensures high torque transmission without stripping, while the headless and flat tip profile allows for flush mounting in tight spaces, securing shafts, collars, and pulleys reliably. This combination of features solves common issues of part misalignment, corrosion-induced failure, and maintenance downtime, providing long-term industrial reliability.

Specification Summary & Compliance

This set screw adheres to strict dimensional and performance criteria, including a Class 3A thread fit per UNC standards, ensuring precise thread engagement. It is manufactured in compliance with the ASME B18.3 specification for set screws. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free of hazardous substances and suitable for global industrial and electronic applications.