支撑环的公称尺寸 NOK代码 d D t BRT2 BRT3 8 18 2 GN4773-V0 GN0725-V0 10 20 2 GN4774-V0 GN0733-V0 14 24 2 GN4775-V0 GN0745-V0 15 28 2 GN4776-V0 GN6445-V0 16 26 2 GN4777-V0 GN0751-V0 18 26 2 GN4778-V0 GN6377-V0 18 31 2 GN4779-V0 GN6446-V0 20 28 2 GN4780-V0 GN6447-V0 20 30 2 GN4781-V0 GN0762-V0 20 33 2 GN4782-V0 GN6448-V0 22 35 2 GN4783-V0 GN6449-V0 22.4 30 2 GN4784-V0 GN6450-V0 22.4 33 2 GN4785-V0 GN6451-V0 23.5 31.5 2 GN4786-V0 GN6452-V0