S-90323A321 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior Corrosion Resistance: Passivated 18-8 stainless steel construction ensures long-term reliability in harsh or humid industrial environments.
• High Mechanical Strength: With a tensile strength of 80,000 psi and Rockwell B95 hardness, this screw withstands high-stress applications without deformation.
• Precise Alignment & Positioning: The precisely machined 5mm diameter shoulder provides accurate component location and reduces wear from misalignment.
• Secure, Low-Profile Fastening: The low-profile hex socket head allows for compact designs and high torque application with standard 2.5mm hex keys.
• Reliable Thread Engagement: Class 6g metric coarse thread (M4 x 0.7mm) ensures consistent, vibration-resistant fastening in right-hand applications.
• Regulatory Compliance Assurance: Meets RoHS 3 and REACH standards, making it suitable for regulated industries and global supply chains.
• Dimensional Consistency: Tight shoulder diameter and length tolerances guarantee repeatable performance in precision assemblies.

Professional Applications & Engineering Value

This M4 shoulder screw delivers critical engineering value in applications requiring precise rotational control and component spacing. Manufactured from 18-8 stainless steel with a passivated finish, it solves common industrial challenges like galvanic corrosion and chemical exposure in machinery, automation systems, and electronic enclosures. The hex socket head and low-profile design enable installation in confined spaces while providing superior torque transmission. The Class 6g thread fit and coarse 0.7mm pitch ensure rapid assembly and vibration resistance in dynamic environments. Its precise shoulder acts as a built-in spacer or pivot point, eliminating the need for additional components in precision jigs, bearings, and linkages, thereby reducing assembly time and improving mechanical accuracy.

Specification Summary & Compliance

This precision shoulder screw features an M4 x 0.7mm coarse metric thread with Class 6g tolerance for reliable fit. The shoulder diameter is 5mm with a tolerance of -0.025 to 0 mm, and shoulder length is 4mm with a tolerance of 0 to 0.05 mm, ensuring precise fit in demanding applications. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and regulated industrial markets.