S-90292A016 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Corrosion Resistance: Crafted from 17-4 PH Stainless Steel, these shoulder screws offer superior durability in harsh environments, reducing replacement frequency and maintenance costs.
• High Tensile and Shear Strength: With a tensile strength of 130,000 psi and minimum shear strength of 65,000 psi, they ensure reliable performance under heavy loads and mechanical stress.
• Precision Thread Fit: Class 3A UNC threads provide tight, secure fastening with minimal backlash, enhancing assembly accuracy and vibration resistance in critical applications.
• Easy Installation and Grip: The knurled socket head with a 5/64" hex drive allows for quick, slip-resistant tool engagement, speeding up assembly while reducing the risk of stripping.
• Stable Shoulder Design: A precise 1/8" shoulder diameter with tight tolerances ensures consistent alignment and spacing for components, improving overall machine integrity.
• Environmental Compliance: Fully compliant with RoHS 3 and REACH standards, making them safe for use in regulated industries and eco-conscious supply chains.
• Versatile Coarse Threading: UNC coarse threads enable faster installation and better performance in materials prone to stripping, increasing efficiency in high-volume production.

Professional Applications & Engineering Value

These 4-40 UNC Class 3A shoulder screws are engineered to address common industrial challenges, such as component misalignment and fastener failure under stress. The 17-4 PH Stainless Steel construction, combined with a Rockwell C28 hardness, provides excellent corrosion resistance and mechanical strength, ideal for precision machinery, automotive assemblies, and aerospace components. The knurled socket head and hex drive design facilitate easy installation in tight spaces, while the standard shoulder fit ensures accurate positioning of gears, bearings, or pulleys. This reduces wear, minimizes downtime, and enhances the longevity of high-demand applications, making them a reliable choice for engineers seeking durability and compliance with RoHS and REACH environmental regulations.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and UNC coarse threading with a 4-40 size. Key tolerances include a shoulder diameter of 1/8" (-0.004" to -0.002") and shoulder length of 5/16" (-0.005" to 0.005"), ensuring consistent performance. Manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for industrial use.