S-90318A830 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high stress
• Precise component alignment enabled by the 16mm shoulder with tight length tolerance (0 to +0.05mm) for accurate assembly positioning
• Optimized space-saving design featuring an ultra-low socket head and compact 2.5mm hex drive for applications with limited clearance
• Consistent threading performance with Class 6g thread fit and coarse 0.7mm pitch for secure fastening and easy installation
• Enhanced durability with Rockwell B70 hardness, resisting wear and deformation in demanding industrial cycles
• Compliance with strict regulations including RoHS 3 and REACH, ensuring safety and environmental standards are met

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to address critical alignment and corrosion challenges in precision assemblies. The 316 stainless steel material provides excellent resistance to chemicals and moisture, making it suitable for marine, chemical processing, and food industry equipment where corrosion is a concern. The 16mm precise shoulder length with controlled tolerance ensures accurate location of moving parts, such as in bearings, gears, and linkages, reducing vibration and misalignment. The ultra-low socket head design minimizes protrusion, allowing for compact assemblies in tight spaces. With a Class 6g thread fit and coarse thread pitch, it offers reliable engagement and quick installation, enhancing efficiency in automated production lines. This fastener is ideal for applications requiring high tensile and shear strength, from machinery to electronic enclosures, delivering long-term reliability and reduced maintenance costs.

Specification Summary & Compliance

This metric shoulder screw adheres to precise dimensional standards, including a Class 6g thread fit for consistent threading and a shoulder diameter tolerance of -0.025 to 0 mm for accurate fits. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial uses. Manufactured to deliver high performance with a tensile strength of 70,000 psi and shear strength of 35,000 psi, it meets rigorous engineering requirements for durability and safety in demanding environments.