We present a new asymptotically flat black hole solution in Null Aether Theory (NAT) by applying Newman–Janis process. For this purpose, we study the asymptotically flat NAT black hole solution in Newman–Janis algorithm and then compute the tunneling radiation for NAT black hole. The Hawking temperature for NAT black hole depends upon the rotation parameter and charge of the black hole. The Hawking temperature describes a black hole with extremal event horizon. Furthermore, we analyze the graphical interpretation of Hawking temperature with respect to event horizon and check the stability of black hole under the influence of different parameters associated with black hole temperature.