S-96125A303 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance and durability from nickel alloy construction, ideal for harsh industrial environments.
• High tensile strength of 70,000 psi ensures reliable performance under significant load and stress.
• Precise Class 3A thread fit guarantees secure, vibration-resistant assemblies with minimal play.
• Knurled socket head with 5/64" hex drive provides superior grip and torque application, reducing tool slippage.
• Coarse UNC threads enable faster installation and improved resistance to loosening in dynamic applications.
• Strict shoulder diameter and length tolerances ensure consistent alignment and smooth rotation in pivoting or guiding uses.
• Compliance with RoHS 3 and REACH regulations assures environmental safety and suitability for regulated industries.

Professional Applications & Engineering Value

This nickel alloy shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment and component wear. Its 1/4" shoulder length and controlled tolerances provide a stable bearing surface for rotating parts, reducing friction and extending service life in assemblies like linkages, pivots, and guides. The 4-40 UNC coarse thread and Class 3A fit ensure rapid, secure fastening in applications subject to vibration, while the Rockwell B60 hardness and high shear strength resist deformation under operational stresses. Ideal for aerospace, automotive, and electronics, it offers reliable performance in corrosive or high-temperature environments, supported by RoHS 3 and REACH compliance for global supply chain integration.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A fit for precise engagement, featuring a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufacturing conforms to specified hardness and strength metrics, including 70,000 psi tensile strength and 35,000 psi minimum shear strength. It is RoHS 3 (2015/863/EU) compliant under exemption 6(c) and REACH (EC 1907/2006) compliant, ensuring adherence to environmental and safety regulations for industrial use.