S-91273A675 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.
• Enhanced durability and wear resistance from the black oxide finish, extending service life.
• High tensile strength of 70,000 psi and shear strength of 35,000 psi for reliable performance under heavy loads.
• Precise component alignment enabled by the 3 1/2" shoulder with controlled tolerances.
• Secure, non-slip installation thanks to the knurled head and hex drive for easy torque application.
• Quick assembly with coarse UNC threads and Class 2A fit for consistent, vibration-resistant fastening.
• Compliance with RoHS 3 and REACH regulations ensures safety and environmental standards are met.

Professional Applications & Engineering Value

This black oxide 18-8 stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical stress. The 3 1/2" shoulder length provides a precise bearing surface for rotating parts like pulleys, gears, and linkages, reducing wear and ensuring smooth operation. Its coarse 1/2"-13 UNC thread allows for rapid installation in high-volume assembly lines, while the socket head with hex drive facilitates tight spaces and high-torque applications. Made from corrosion-resistant 18-8 stainless steel and finished with a protective black oxide coating, it excels in automotive, machinery, and outdoor equipment where durability and precision are critical.

Specification Summary & Compliance

The screw features a Class 2A thread fit for standard tolerance and easy assembly, with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005" ensuring dimensional accuracy. It conforms to UNC thread standards and is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting safe and sustainable industrial use.