S-91273A111 5-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable load-bearing in demanding applications.
• Precision alignment and location enabled by the 1/8" shoulder diameter with tight manufacturing tolerances, ensuring accurate component positioning.
• Secure and efficient installation via the hex socket drive and knurled head, providing excellent grip and reducing the risk of tool slippage.
• Wide compatibility and reliable threading with UNC coarse threads and Class 2A fit, facilitating easy assembly and consistent performance.
• Enhanced durability from Rockwell B55 hardness, resisting wear and deformation under operational stress.
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safety and suitability for international industrial markets.

Professional Applications & Engineering Value

This 5-40 UNC shoulder screw is engineered to address critical alignment and fastening challenges in precision assemblies. The 1/8" shoulder diameter with controlled tolerances acts as a precise locating dowel, preventing lateral movement in machinery, rotary equipment, and pivoting mechanisms. Manufactured from 18-8 Stainless Steel, it provides excellent resistance to rust and corrosion, making it suitable for applications in moist or chemically aggressive environments. The hex socket head with a knurled texture ensures high-torque installation without cam-out, while the coarse thread spacing and Class 2A thread fit offer quick assembly and reliable holding power. Ideal for use in industrial automation, precision instruments, and mechanical linkages, this screw enhances assembly accuracy, reduces maintenance needs, and improves overall system longevity.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. The shoulder diameter tolerance is specified at -0.004" to -0.002", and the shoulder length tolerance is -0.005" to 0.005", ensuring high dimensional accuracy. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in products distributed globally without hazardous substances.