S-91273A532 5-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high stress.
• Precise assembly and alignment ensured by a consistent 1/8" shoulder diameter and 1" length with tight tolerances.
• Secure, non-slip fastening with a knurled socket head and hex drive for easy installation and reduced tool slippage.
• Wide compatibility and easy engagement thanks to 5-40 UNC coarse right-hand threads and Class 2A fit.
• Enhanced durability and wear resistance from Rockwell B55 hardness, extending service life in demanding applications.
• 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 address critical alignment and pivot point challenges in industrial machinery, automation systems, and precision instruments. The 18-8 stainless steel material, combined with a black oxide finish, provides excellent resistance to corrosion and oxidation, reducing maintenance in humid or chemically aggressive settings. The 1/8" shoulder diameter and 1" shoulder length offer a precise bearing surface, minimizing component misalignment and wear. With a coarse thread design and Class 2A fit, it ensures quick assembly and reliable holding power, while the socket head with hex drive allows for efficient installation in confined spaces. Ideal for use in pivots, spacers, and rotating assemblies, this screw enhances operational accuracy and longevity.

Specification Summary & Compliance

This shoulder screw features a 5-40 UNC coarse thread with Class 2A tolerance for precise fit, a shoulder diameter of 1/8" (tolerance: -0.004" to -0.002"), and shoulder length of 1" (tolerance: -0.005" to 0.005"). Manufactured from 18-8 stainless steel with a black oxide finish, it meets mechanical properties including Rockwell B55 hardness, 70,000 psi tensile strength, and 35,000 psi shear strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard reliability.