Square Shaft Adapter Product Type Square Shaft Adapter Compatible with Brand Johnson Controls Compatible with Manufacturer Model Number M9220-BAC-3 Compatible with Grainger Part Number 41P596 Compatible with Series M9220 Includes Retainer Maximum Round Shaft Diameter 1/2 in Maximum Square Shaft Width 1/2 in Minimum Round Shaft Diameter 1/4 in Minimum Square Shaft Width 1/2 in Standards CE Listed CSA C22.2 No.139 EMC Directive 2004/108/EC UL 873 File E27734 CCN XAPX