S-99154A393 2-56 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments.
• Precise alignment and reduced wear due to the precisely machined shoulder with controlled diameter and length tolerances.
• High-strength performance with a tensile strength of 70,000 psi and Rockwell B55 hardness for reliable load-bearing applications.
• Secure, low-profile installation with the socket head design, allowing for a flush finish in tight spaces.
• Consistent and reliable threading with UNC coarse threads and a Class 2A fit, ensuring easy assembly and vibration resistance.
• Compliance with stringent environmental regulations, including RoHS 3 and REACH, for use in regulated markets.
• Optimized for right-hand thread applications, providing standard directional fastening for common assembly processes.

Professional Applications & Engineering Value

This 2-56 UNC shoulder screw is engineered to solve critical alignment and spacing challenges in precision assemblies. The low-profile socket head minimizes protrusion, making it perfect for compact machinery, electronic enclosures, and automated equipment where space is constrained. The precise shoulder fit acts as a pivot, bearing surface, or locator, eliminating misalignment and reducing wear on mating components. Manufactured from 18-8 stainless steel, it offers excellent resistance to corrosion and oxidation, ensuring long-term reliability in demanding environments like medical devices, aerospace components, and food processing machinery. Its 70,000 psi tensile strength and Class 2A thread fit guarantee secure fastening and vibration resistance, streamlining maintenance and improving overall assembly integrity.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. The shoulder features precise dimensional control with a diameter tolerance of -0.001" to 0" and a length tolerance of 0" to 0.002". It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances for safe use in industrial and consumer applications.