S-90323A459 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• Precise alignment and smooth rotation due to the accurately machined 50mm shoulder with tight diameter tolerance (-0.025 to 0 mm).
• High mechanical strength offering 80,000 psi tensile strength and Rockwell B95 hardness for demanding load-bearing applications.
• Secure and flush installation enabled by the low-profile hex socket head, preventing tampering and saving space.
• Reliable thread engagement with Class 6g fit and coarse M4 x 0.7mm thread, ensuring vibration resistance and easy assembly.
• Compliance with strict environmental regulations including RoHS 3 and REACH, making it suitable for global industrial supply chains.
• Consistent dimensional accuracy with controlled shoulder length tolerance (0 to 0.05 mm) for repeatable performance in precision assemblies.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to address critical alignment and wear issues in precision machinery, automation systems, and fixturing applications. The 50mm shoulder length with precise diameter control acts as a pivot or axle, reducing bushing wear and maintaining component alignment under lateral loads. Made from 18-8 stainless steel with a passivated finish, it resists corrosion from coolants, oils, and atmospheric exposure, extending service life in demanding environments. The hex socket drive and low-profile head allow for compact designs and secure fastening in confined spaces, while the Class 6g thread fit ensures reliable engagement in metric coarse threaded assemblies, minimizing loosening from vibrations.

Specification Summary & Compliance

This precision shoulder screw features an M4 x 0.7mm metric coarse thread with Class 6g thread fit, a shoulder diameter of 5 mm (tolerance: -0.025 to 0 mm), and shoulder length of 50 mm (tolerance: 0 to 0.05 mm). It is manufactured from 18-8 stainless steel with a passivated finish, and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring suitability for industrial and international markets.