S-93996A123 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant performance with a permanent nylon patch thread locker that maintains integrity from -70° to 250°F, reducing loosening in dynamic applications.
• High durability and corrosion resistance thanks to 18-8 stainless steel construction, offering long-term reliability in harsh industrial environments.
• Exceptional strength under load with a tensile strength of 70,000 psi and Rockwell B55 hardness, ensuring secure fastening in high-stress assemblies.
• Precise alignment and spacing due to the smooth shoulder with 1/8" diameter and 7/16" length, minimizing component misalignment.
• Easy installation and removal with a standard socket head and right-hand UNC coarse threads, compatible with common tools for efficient maintenance.
• Reliable thread engagement through Class 2A thread fit, providing consistent performance and reducing the risk of cross-threading.
• Compliance with environmental standards including RoHS 3 and REACH, making it suitable for global industrial and electronic applications.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address common industrial challenges such as vibration-induced loosening and misalignment in precision assemblies. The nylon patch thread locker ensures a permanent lock without the need for additional adhesives, ideal for machinery, automotive, and electronics where temperature fluctuations from -70° to 250°F occur. Made from 18-8 stainless steel, it resists corrosion and wear, while the precise 1/8" shoulder diameter and 7/16" shoulder length provide accurate component positioning, reducing assembly errors. Its socket head design and coarse UNC threads facilitate quick installation, making it a reliable choice for high-tensile applications requiring consistent performance and minimal maintenance.

Specification Summary & Compliance

This shoulder screw features a Class 2A thread fit with UNC coarse threads for reliable engagement, and precise shoulder dimensions (diameter tolerance: -0.001" to 0", length tolerance: 0" to 0.002") to ensure accurate fits. Manufactured to high standards, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable industrial use. The specifications, including tensile strength and hardness, adhere to common engineering requirements for durability and performance.