S-91273A345 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and washdown applications.
• Enhanced torque transmission and anti-slip grip from the knurled hex socket head design, ensuring secure fastening in high-vibration settings.
• Precision alignment and smooth rotation due to the 35mm shoulder with controlled diameter tolerance, reducing wear on mating components.
• High mechanical strength and durability with Rockwell B55 hardness and 70,000 psi tensile strength, suitable for demanding structural loads.
• Reliable coarse thread engagement with Class 5g6g fit, enabling quick assembly and consistent clamping force in automated production.
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safe use in electronics, machinery, and consumer products.
• Optimized for standard hex tools with 2mm drive size, facilitating efficient installation and maintenance with common workshop equipment.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to address critical alignment and load-bearing challenges in precision assemblies. The 18-8 stainless steel material provides excellent resistance to oxidation and chemical exposure, making it suitable for food processing, medical devices, and outdoor equipment. The 35mm shoulder length acts as a precise pivot or spacer, minimizing radial play in rotating parts like gears, pulleys, and linkages. Combined with the coarse M3x0.5 thread and Class 5g6g tolerance, it ensures rapid installation and secure fit in high-volume manufacturing. The knurled socket head enhances torque application, reducing the risk of stripping during repeated disassembly. Ideal for CNC machinery, robotics, and conveyor systems, this fastener delivers long-term reliability under dynamic stresses.

Specification Summary & Compliance

This shoulder screw conforms to metric threading standards with M3x0.5 coarse pitch and Class 5g6g thread fit for consistent engagement. Shoulder diameter tolerance is controlled between -0.04 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm, ensuring precise assembly. Manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, it is free of restricted substances. The mechanical properties include a minimum shear strength of 35,000 psi, supporting robust performance in industrial applications.