*PLUMBERSSTOCK EXPERT* responded:
Hi there! Thank you for asking a question about the Milwaukee 48-66-1400 Chuck. If I understand your question correctly, you want to know if this Milwaukee 48-66-1400 will fit with the Milwaukee 5376-1 (Serial No. 819B). Yes, it will. This drill chuck will fit the Milwaukee 5376-1 (Serial No. 819B) chuck hammer drill. If you're interested in purchasing the Milwaukee 48-66-1400, simply click "Add to Cart", enter the required information and you'll be on your way. Please let us know if you have any other questions or concerns about this drill chuck. We are always happy to help.