S-92012A505 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior strength and durability with alloy steel construction and 140,000 psi tensile strength for reliable performance in demanding applications
• Enhanced corrosion resistance from the black oxide finish, extending service life in harsh industrial environments
• Precise alignment and secure positioning thanks to the smooth, precisely machined shoulder with tight diameter and length tolerances
• Consistent, reliable fastening with Class 2A thread fit and UNC coarse threads for easy assembly and vibration resistance
• High torque capability and flush installation from the 5/64" hex socket drive and standard socket head profile
• Optimal hardness for wear resistance with Rockwell C32 rating, maintaining thread integrity under load
• Compliance with environmental and safety standards including RoHS 3 and REACH, ensuring suitability for regulated industries

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and spacing challenges in precision assemblies. The alloy steel core, hardened to Rockwell C32, provides exceptional shear and tensile strength, preventing failure in high-stress applications like machinery, automotive components, and electronic enclosures. The black oxide finish not only resists corrosion but also reduces galling during installation. The precise shoulder, with diameters and lengths held to tight tolerances, acts as a reliable pivot or spacer, eliminating misalignment in rotating parts or guiding moving components. Combined with coarse UNC threads and Class 2A fit, it ensures quick, secure fastening even in vibrating environments, reducing assembly time and maintenance needs.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. Critical dimensions include a shoulder diameter of 1/8" (tolerance: -0.001" to 0") and shoulder length of 5/8" (tolerance: 0" to 0.002") for precise assembly. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of restricted substances for use in regulated industrial and electronic applications.