S-98621A125 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Wear Resistance: TiCN coating significantly extends service life in high-friction applications, reducing replacement frequency and maintenance costs.
• Superior Corrosion & Chemical Resistance: 18-8 Stainless Steel construction ensures reliable performance in harsh or corrosive industrial environments.
• High Mechanical Strength: With a tensile strength of 70,000 psi and Rockwell B55 hardness, this screw withstands substantial loads and stress without failure.
• Precise Alignment & Secure Fit: The precisely machined shoulder with tight diameter and length tolerances ensures accurate component positioning and eliminates play.
• Secure, High-Torque Fastening: The internal hex socket (2.5mm drive) allows for high tightening torque and prevents stripping, ideal for confined spaces.
• Reliable Thread Engagement: Class 6g thread tolerance on the M4 x 0.7mm coarse thread provides consistent and secure fastening in a wide range of materials.
• Global Regulatory Compliance: Meets RoHS 3 and REACH standards, ensuring safety and environmental responsibility for international industrial projects.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to solve critical alignment and durability challenges in precision assemblies. The 18-8 Stainless Steel core offers excellent resistance to rust and oxidation, making it ideal for machinery, automation systems, and equipment exposed to moisture or chemicals. The TiCN coating dramatically increases surface hardness, providing exceptional wear resistance in moving parts like linkages, pivots, and rotating assemblies, thereby reducing galling and seizing. The precise shoulder fit acts as a dowel, ensuring accurate radial alignment of components such as gears, pulleys, and bearings, which minimizes vibration and wear. Combined with the hex socket head for secure installation in tight spaces, this screw delivers reliable performance in demanding industrial applications, from automotive jigs to semiconductor manufacturing equipment.

Specification Summary & Compliance

This precision metric shoulder screw features an M4 thread with a coarse 0.7mm pitch and a Class 6g thread fit for reliable engagement. The unthreaded shoulder has a diameter of 5mm (tolerance: -0.025 to 0 mm) and a length of 8mm (tolerance: 0 to 0.05 mm), ensuring a precise press or sliding fit. Manufactured from 18-8 Stainless Steel with a tensile strength of 70,000 psi, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations.