S-91273A509 M20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise component alignment ensured by the 45mm shoulder with tight length tolerance (0 to +0.25mm)
• High-strength performance delivering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications
• Secure and efficient installation with 10mm hex socket drive and knurled head for enhanced grip during tightening
• Reliable thread engagement with Class 5g6g metric coarse thread (M20x2.5) ensuring consistent fit
• Durable wear resistance from Rockwell B55 hardness, extending service life in high-stress assemblies
• Environmental compliance meeting RoHS 3 and REACH standards for safe, regulated use

Professional Applications & Engineering Value

This M20 shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery. The 18-8 stainless steel material provides excellent resistance to rust and chemical exposure, making it suitable for food processing, marine, and outdoor equipment. The 45mm shoulder length with minimal tolerance allows for precise positioning of moving parts like gears, pulleys, and bearings, reducing wear and vibration. The hex socket drive and knurled head facilitate secure installation in confined spaces, while the Class 5g6g coarse thread ensures quick assembly and high fatigue resistance under dynamic loads. Ideal for robotics, conveyor systems, and automotive jigs, this screw enhances assembly accuracy and operational reliability.

Specification Summary & Compliance

This shoulder screw adheres to metric system standards with M20x2.5 coarse threads conforming to Class 5g6g tolerance. The shoulder diameter is manufactured to -0.04 to -0.01 mm tolerance, and shoulder length to 0 to +0.25 mm, ensuring precise fit. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material integrity for global industrial use.