The hinge axis of Surface Pro 7 and 8 is the same. According to reports, Microsoft announced a patent called a friction hinge with clutch resistance at the end of February 2019, which has high and low closing resistance levels of friction and introduces a clutch device. According to reports, Microsoft announced a patent called a friction hinge with clutch resistance at the end of February 2019, which has high and low closing resistance levels of friction and introduces a clutch device. This stepless rotating shaft can stop at any angle between 25 and 130. The resistance during the turning process is even and smooth.