S-90323A457 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior Corrosion Resistance: Crafted from 18-8 Stainless Steel with a passivated finish to withstand harsh industrial environments and extend service life.
• Exceptional Mechanical Strength: Delivers a high 80,000 psi tensile strength and Rockwell B95 hardness for reliable performance under load and in high-stress assemblies.
• Precise Alignment & Smooth Rotation: Features a precisely machined 40mm shoulder with tight diameter and length tolerances for accurate component location and reduced wear.
• Space-Saving, Secure Fastening: The low-profile socket head with a 2.5mm hex drive allows for installation in confined spaces while providing a secure, tamper-resistant connection.
• Reliable Thread Engagement: Class 6g thread fit on the M4x0.7 coarse thread ensures consistent, vibration-resistant fastening and easy assembly.
• Compliance with Global Standards: Meets RoHS 3 and REACH regulations, ensuring safety and environmental compliance for worldwide industrial and commercial applications.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to solve critical alignment and durability challenges in precision assemblies. The 40mm precisely machined shoulder acts as a pivot, axle, or spacer, ensuring components like gears, bearings, and linkages maintain exact positioning and smooth rotation without the need for additional bushings. Manufactured from corrosion-resistant 18-8 stainless steel, it is ideal for applications exposed to moisture, chemicals, or demanding operational conditions. The low profile socket head design is perfect for compact machinery and electronic enclosures where space is limited, while the Class 6g thread fit and coarse thread spacing provide robust, reliable fastening that resists loosening under vibration. This combination of precision shoulder fit, material integrity, and thoughtful design delivers long-term reliability in automation, medical devices, and precision instrumentation.

Specification Summary & Compliance

This screw features an M4x0.7 metric coarse thread with a Class 6g thread fit for standard industrial tolerance. The shoulder is manufactured to precise dimensional controls: 5mm shoulder diameter with a tolerance of -0.025 to 0 mm and a 40mm shoulder length with a tolerance of 0 to 0.05 mm. It conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global supply chains.