S-91979A307 4-40 x 1/8" 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.
• Precise and secure fastening ensured by Class 3A thread fit, providing tighter tolerances for vibration-resistant assemblies.
• Efficient installation and removal using the 0.050" hex drive, allowing for easy access in confined spaces.
• Effective pressure relief and debris management through the vented design with a 0.035" vent diameter, preventing pressure buildup.
• Reliable holding power with the cup tip, which bites into surfaces to prevent component slippage.
• Compliance with environmental and safety standards, including RoHS 3 and REACH, ensuring safe use in regulated industries.
• Versatile coarse UNC threading for quick assembly and disassembly in various industrial applications.

Professional Applications & Engineering Value

This 4-40 UNC set screw is engineered from 18-8 Stainless Steel to combat corrosion in demanding environments like machinery, automotive, and electronics. Its Class 3A thread fit and coarse thread spacing deliver high precision and resistance to loosening under vibration, while the vented design with a 0.035" diameter prevents pressure accumulation in sealed systems. The headless and hex drive configuration allows for flush mounting and easy tool access, making it ideal for securing components in tight spaces. This set screw ensures reliable performance in assemblies requiring right-hand thread and cup tip engagement for enhanced grip.

Specification Summary & Compliance

This product adheres to UNC thread standards with a Class 3A thread fit for precise dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety. Specifications include a 4-40 thread size, 1/8" length, and 0.050" hex drive, designed for reliable industrial use without rated hardness.