A22E-M-01 Limit sensor 
Core Specifications

• Switch Type: Emergency stop push-button (latching push-lock/turn-reset)
• Contact Configuration: 1 Normally Closed (NC)
• Panel Cutout Diameter: 22 mm (compatible with 25 mm via ring)
• IP Protection Rating: IP65 (dust-tight, oil-resistant, and water-resistant)
• Actuator Size/Color: 40 mm red mushroom head 

If you need an actual Omron limit switch or a specific safety sensor alternative, please share:

• The application or machine type
• The required actuator style (roller lever, pin plunger, etc.)
• The electrical contact configuration

I can help you find the correct part number.