S-96126A125 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance thanks to 316 Stainless Steel construction, ideal for harsh environments and chemical exposure
• High-strength performance with 70,000 psi tensile strength and Rockwell B79 hardness for reliable load-bearing in demanding applications
• Precise component alignment enabled by the smooth, accurately machined 1/8" diameter shoulder with tight diameter and length tolerances
• Secure, flush installation using the standard socket head with 5/64" hex drive, allowing for high torque application and a clean profile
• Durable, long-lasting surface protection from the passivated finish, which enhances corrosion resistance and minimizes galling
• Reliable, standardized threading with 4-40 UNC coarse threads and Class 2A fit for consistent engagement and ease of assembly
• Compliance with global regulations including RoHS 3 and REACH, ensuring material safety and environmental responsibility

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and pivot point requirements in precision assemblies. The 316 Stainless Steel material provides superior resistance to corrosion and oxidation, making it suitable for marine, chemical processing, and food-grade equipment where moisture and corrosive agents are present. The precise shoulder diameter and length act as a dependable datum for locating parts, reducing assembly time and eliminating misalignment in machinery, robotics, and optical devices. The combination of a socket head and passivated finish ensures easy installation with standard tools while maintaining a durable, low-friction surface. This screw is a trusted component for engineers seeking a corrosion-resistant, high-strength fastener that maintains dimensional stability under load.

Specification Summary & Compliance

This shoulder screw features a 4-40 UNC coarse thread with a Class 2A thread fit for standard tolerance and reliable engagement. The shoulder is manufactured to precise dimensions: 1/8" diameter with a tolerance of -0.001" to 0" and 5/16" length with a tolerance of 0" to 0.002". The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to strict environmental and safety standards for industrial use.