0001374535 2021-11-17 2021-11-17 false 0001374535 8-K 2021-11-17 ALTRA INDUSTRIAL MOTION CORP. DE 001-33209 61-1478870 300 Granite Street Suite 201 Braintree MA 02184 781 917-0600 false false false false Common Stock (par value $0.001) AIMC NASDAQ false