S-91273A902 1/2"-13 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and extended service life
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi shear strength for high-stress applications
• Precision alignment and location enabled by the 2" shoulder with tight ±0.005" length tolerance for accurate component positioning
• Secure, non-slip installation provided by the knurled hex socket head, allowing for high-torque application without tool slippage
• Reliable and fast assembly with coarse 1/2"-13 UNC threads and Class 2A fit, ensuring easy starting and consistent engagement
• Compliance with global standards including RoHS 3 and REACH, meeting stringent environmental and safety regulations for international supply chains
• Durable wear resistance from Rockwell B55 hardness, maintaining thread integrity and shoulder dimensions under repeated use

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to solve critical alignment and pivot point challenges in precision industrial applications. The 2" shoulder length with its minimal tolerance acts as a precise axle or dowel, eliminating the need for additional bushings and reducing assembly components. The 18-8 Stainless Steel material provides excellent corrosion resistance, making it suitable for food processing, packaging machinery, and outdoor equipment where moisture is a concern. The combination of the coarse UNC thread and Class 2A fit ensures rapid, secure fastening in metal and plastic assemblies, while the hex socket drive with a knurled head offers superior grip for high-torque installation in confined spaces, preventing cam-out and reducing assembly time.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC coarse thread with a Class 2A thread fit for standard clearance and reliable engagement. The precision shoulder diameter is 1/2" with a tolerance of -0.004" to -0.002", and the shoulder length is 2" with a tight tolerance of ±0.005". The fastener is manufactured from 18-8 Stainless Steel and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances for use in regulated markets.