S-91273A512 M20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and reducing replacement frequency.
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under high-stress applications.
• Precise component alignment enabled by the 55mm shoulder with tight diameter tolerance, minimizing assembly play and vibration.
• Secure, high-torque installation using the 10mm hex socket drive and knurled head, preventing tool slippage and ensuring consistent clamping force.
• Wide compatibility and easy assembly with M20x2.5 coarse right-hand Class 5g6g metric thread, conforming to standard industrial mating parts.
• Enhanced durability and shear resistance with a minimum shear strength of 35,000 psi, suitable for heavy-duty rotational and pivoting mechanisms.
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe use in regulated markets and sustainable operations.

Professional Applications & Engineering Value

This M20 shoulder screw is engineered to address critical alignment and wear challenges in industrial applications. The precision-ground 20mm shoulder diameter with a tight tolerance of -0.04 to -0.01 mm ensures exact locating of components like gears, pulleys, and linkages, eliminating misalignment and reducing eccentric wear. Manufactured from 18-8 Stainless Steel, it offers excellent resistance to rust and chemical exposure, making it suitable for food processing, packaging machinery, and outdoor equipment. The hex socket head with knurling provides secure drive engagement, even in greasy or high-vibration environments, while the Class 5g6g thread fit guarantees smooth assembly and reliable fastening in metric coarse threaded systems. Its robust tensile and shear strength supports dynamic loads in pivoting arms and rotating assemblies, delivering long-term reliability and reduced maintenance cycles.

Specification Summary & Compliance

This metric shoulder screw features an M20x2.5 coarse right-hand thread with a Class 5g6g thread fit per ISO standards, ensuring dimensional accuracy and interchangeability. The shoulder maintains a diameter tolerance of -0.04 to -0.01 mm and a length tolerance of 0 to 0.25 mm for precise fits. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances for safe use in industrial and export applications.