S-97832A190 4-40 Shoulder 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 alignment and reduced wear due to the Class 3A thread fit, ensuring tight tolerances and smooth assembly in high-accuracy applications.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding, heavy-duty use.
• Enhanced grip and tool engagement from the knurled socket head and 5/64" hex drive, preventing slippage during installation.
• Reliable shoulder performance with a 1-1/4" shoulder length and tight diameter tolerance, providing stable pivoting and spacing in assemblies.
• Broad compatibility with UNC coarse threads and right-hand direction, conforming to common industrial standards for easy integration.
• Environmental and regulatory compliance meeting RoHS 3 and REACH standards, ensuring safe use in global markets.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment and component wear. The 18-8 Stainless Steel material provides excellent corrosion resistance, making it suitable for applications in moist or chemically aggressive environments, including automotive, aerospace, and electronic assemblies. The Class 3A thread fit and tightly controlled shoulder dimensions (±0.005" length tolerance) ensure accurate positioning and reduced vibration, enhancing the lifespan of rotating parts like bearings and pulleys. With a knurled socket head for secure tool engagement and coarse UNC threads for quick fastening, it streamlines maintenance and improves operational efficiency in high-stress industrial settings.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A fit for precise thread engagement. Dimensions include a shoulder diameter of 1/8" (tolerance: -0.004" to -0.002") and shoulder length of 1-1/4" (tolerance: -0.005" to 0.005"), ensuring consistent performance. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting environmentally responsible manufacturing and use in regulated industries.