S-91273A113 5-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Enhanced grip and torque application thanks to the knurled hex socket head design, preventing tool slippage
• Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications
• Precise component alignment and spacing ensured by the 1/8" shoulder diameter with tight manufacturing tolerances
• Reliable and quick assembly with a coarse UNC thread and Class 2A fit, providing smooth engagement
• Long-term durability supported by Rockwell B55 hardness, resisting wear and deformation
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use

Professional Applications & Engineering Value

This 5-40 UNC shoulder screw is engineered to solve critical alignment and rotational control challenges in precision assemblies. The 18-8 stainless steel material offers excellent resistance to rust and corrosion, making it suitable for machinery, automotive, and electronic applications exposed to moisture or chemicals. The hex socket head with a knurled texture ensures secure tool engagement, reducing the risk of stripping during high-torque installation. The precisely machined shoulder acts as a pivot or bearing surface, maintaining accurate positioning of components like gears, linkages, and pulleys. Its coarse thread and Class 2A thread fit facilitate faster assembly while maintaining strength, reducing production downtime and improving overall system reliability in industrial settings.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent, reliable fastening. The shoulder diameter is 1/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 1/4" with a tolerance of -0.005" to 0.005", ensuring high dimensional accuracy. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming its suitability for regulated industries and environmentally conscious applications.