Industrial Internet of things (IIoT) infrastructure for smart manufacturing refers to common facilities based on IoT that support smart manufacturing in industries or sectors. It is independent from the products and production process in specific enterprises. This Recommendation provides requirements and reference framework of the IIoT infrastructure capabilities for smart manufacturing to help service providers implementing their system according to the needs of smart manufacturing, and merge existing and newly developed IIoT infrastructure, in order to give the stakeholders of smart manufacturing guidance for their applications.