S-91273A503 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.
• Enhanced torque transmission and secure fastening via the 10 mm hex socket drive, minimizing tool slippage during installation.
• Precise component alignment and smooth rotation ensured by the 20 mm diameter shoulder with controlled tolerances.
• Reliable thread engagement and vibration resistance from the M20x2.5 coarse pitch thread with Class 5g6g fit for consistent performance.
• Improved grip and handling provided by the knurled head texture, even in oily or gloved conditions.
• High mechanical strength and durability with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications.
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use.

Professional Applications & Engineering Value

This M20 shoulder screw is engineered to address critical alignment and wear challenges in industrial applications. The 18-8 Stainless Steel material offers excellent corrosion resistance, extending service life in moist or chemically aggressive settings. The precision shoulder with a diameter of 20 mm and tight tolerances ensures accurate positioning of moving parts, such as in machinery linkages, pivots, and assemblies, reducing misalignment and premature wear. The Class 5g6g thread fit and coarse pitch provide robust, vibration-resistant fastening, essential for high-stress environments. Combined with the hex socket drive for efficient torque application, this screw delivers reliable performance in automation equipment, conveyor systems, and precision instruments, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This metric shoulder screw features an M20x2.5 coarse pitch right-hand thread with a Class 5g6g thread fit for standard industrial use. The shoulder diameter is 20 mm with a tolerance of -0.04 to -0.01 mm, and the shoulder length is 20 mm with a tolerance of 0 to 0.25 mm, ensuring precise dimensional control. Manufactured from 18-8 Stainless Steel with a hardness of Rockwell B55, it meets a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and environmentally responsible procurement.