S-90323A454 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior Corrosion Resistance: 18-8 Stainless Steel construction with a passivated finish ensures long-term durability and reliability in harsh or humid industrial environments.
• Precise Component Alignment: The 25mm shoulder length with a precise fit acts as a pivot, bearing, or spacer, ensuring accurate assembly and reducing wear on mating parts.
• High-Strength Fastening: With a tensile strength of 80,000 psi and a Rockwell B95 hardness, this screw provides a secure, vibration-resistant hold for demanding applications.
• Reliable Thread Engagement: The Class 6g thread fit on the M4 x 0.7mm coarse thread guarantees consistent, predictable clamping force and easy assembly.
• Low-Profile, Secure Drive: The low-profile socket head with a 2.5mm hex drive allows for installation in tight spaces while providing high torque transfer and a clean aesthetic.
• Compliant for Global Markets: Meets RoHS 3 and REACH compliance standards, making it suitable for use in regulated industries and international supply chains.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to solve critical alignment and pivot-point challenges in machinery and assemblies. The 25mm shoulder provides a precise, unthreaded bearing surface that is essential for applications like linkages, gears, and rotating assemblies, preventing thread damage and ensuring smooth operation. Manufactured from 18-8 Stainless Steel with a passivated finish, it offers excellent resistance to oxidation and corrosion, which is vital for equipment in manufacturing, automation, and outdoor environments. The combination of a Class 6g thread fit and a coarse M4 x 0.7mm thread ensures rapid assembly and a reliable grip, reducing the risk of cross-threading. Its low-profile socket head is ideal for compact designs where clearance is limited, providing a secure fastening solution that maintains structural integrity under loads up to 80,000 psi tensile strength.

Specification Summary & Compliance

This M4 shoulder screw features a Class 6g thread fit per metric standards, ensuring dimensional accuracy for the M4 x 0.7mm coarse thread. The shoulder diameter is held to a tight tolerance of -0.025 to 0 mm, and the shoulder length is 25 mm with a tolerance of 0 to 0.05 mm for precise fitment. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in products requiring adherence to strict environmental and safety standards.