S-90323A458 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ensuring long-term reliability in harsh or humid environments.
• Precise alignment and reduced wear due to the smooth, low-profile socket head and precisely machined shoulder with tight diameter tolerance.
• High mechanical strength offering Rockwell B95 hardness and 80,000 psi tensile strength for demanding loads and repeated use.
• Easy installation and removal with a 2.5 mm hex socket drive, providing secure torque application in confined spaces.
• Accurate and secure fastening ensured by the Class 6g thread fit and coarse M4 x 0.7 mm thread, minimizing loosening under vibration.
• Compliance with environmental standards including RoHS 3 and REACH, making it safe for various industrial and export applications.
• Versatile right-hand coarse thread designed for quick assembly in machinery, automation, and metal fabrication projects.

Professional Applications & Engineering Value

This precision M4 shoulder screw is engineered to address common industrial challenges such as misalignment, component wear, and corrosion. Made from 18-8 stainless steel with a passivated finish, it resists rust and chemical exposure, extending service life in demanding settings like automation equipment, CNC machinery, and assembly jigs. The 45mm shoulder length and precise shoulder diameter provide a stable pivot or spacer, reducing bushing wear and ensuring accurate part positioning. With a Class 6g thread fit and hex socket drive, it allows for reliable, vibration-resistant fastening in tight spaces, enhancing efficiency in metric coarse thread applications across manufacturing and engineering sectors.

Specification Summary & Compliance

This shoulder screw adheres to metric system standards with an M4 x 0.7 mm coarse thread and Class 6g thread fit for consistent dimensional accuracy. The shoulder features a diameter of 5 mm with a tolerance of -0.025 to 0 mm and a length of 45 mm with a tolerance of 0 to 0.05 mm, ensuring precise assembly. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and global industrial use.