S-98621A129 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior Wear Resistance: TiCN coating extends service life in high-friction environments, reducing replacement frequency and maintenance costs.
• Excellent Corrosion Resistance: 18-8 stainless steel construction ensures reliable performance in humid or corrosive industrial settings.
• Precise Alignment & Stability: Tight shoulder diameter tolerance (±0.025mm) and Class 6g thread fit guarantee accurate component positioning and reduced vibration.
• High Tensile Strength: 70,000 psi rating provides dependable load-bearing capacity for demanding mechanical assemblies.
• Optimized Drive Engagement: 2.5mm hex socket head allows secure tool engagement, minimizing stripping and enabling efficient installation.
• Consistent Shoulder Dimensions: Controlled shoulder length tolerance (0 to 0.05mm) ensures repeatable spacing and alignment in automated applications.
• Regulatory Compliance: Meets RoHS 3 and REACH standards, ensuring safe use in regulated industries and global market acceptance.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to address critical alignment and durability challenges in precision machinery. The 18-8 stainless steel base material offers inherent corrosion resistance, while the TiCN coating significantly enhances surface hardness, reducing galling and wear in high-cycle applications like CNC tooling, robotics, and conveyor systems. The Class 6g thread fit and precisely machined shoulder (5mm diameter with tight tolerance) ensure components such as bearings, gears, and pulleys maintain exact positioning without shimming, minimizing assembly time and preventing operational drift. Its 70,000 psi tensile strength and Rockwell B55 hardness provide reliable performance under dynamic loads, making it ideal for automation equipment, medical devices, and packaging machinery where precision shoulder screws are critical for operational accuracy and longevity.

Specification Summary & Compliance

This metric shoulder screw adheres to ISO metric thread standards with M4x0.7 coarse right-hand threads and Class 6g thread fit for consistent engagement. The shoulder features a diameter of 5mm with a tolerance of -0.025 to 0mm and length of 16mm with 0 to 0.05mm tolerance, ensuring precise shoulder fit. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material restrictions adherence for industrial and export applications.