S-90323A326 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel and passivated finish, ensuring long-term reliability in harsh environments.
• High mechanical strength and durability with 80,000 psi tensile strength and Rockwell B95 hardness for demanding industrial applications.
• Precise alignment and reduced wear thanks to the accurately machined shoulder with tight diameter and length tolerances.
• Easy installation in confined spaces using the low-profile hex socket head and 2.5 mm drive size.
• Reliable thread engagement with Class 6g fit and coarse 0.7 mm pitch for quick assembly and vibration resistance.
• Compliance with environmental regulations including RoHS 3 and REACH, making them suitable for global markets.
• Versatile metric sizing with M4 thread, 5 mm thread length, and 12 mm shoulder length for standardized equipment designs.

Professional Applications & Engineering Value

These precision shoulder screws are engineered to address critical alignment and durability challenges in industrial machinery. The 18-8 stainless steel construction, combined with a passivated finish, provides excellent resistance to corrosion and oxidation, extending component life in humid or chemically aggressive settings. The precise shoulder fit ensures accurate positioning of moving parts—such as gears, pulleys, and linkages—reducing eccentric wear and maintenance downtime. With a low head profile and hex socket drive, they allow for secure fastening in tight spaces common in automation systems, CNC equipment, and precision instruments. The Class 6g thread and coarse 0.7 mm pitch facilitate robust, vibration-resistant connections, making them ideal for high-stress applications where reliability is paramount.

Specification Summary & Compliance

This M4 shoulder screw features a Class 6g thread fit per metric standards, with a shoulder diameter tolerance of -0.025 to 0 mm and shoulder length tolerance of 0 to 0.05 mm for high precision. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety. The mechanical properties, including 80,000 psi tensile strength and Rockwell B95 hardness, confirm its suitability for rigorous engineering use.