公称尺寸 /mm 允许偏差 (%) 6 1/8 10.0 2.00 0.39 1.064 8 1/4 13.5 2.25 0.62 1.056 10 3/8 17.0 2.25 0.32 1.056 15 1/2 21.3 2.75 1.26 1.047 20 3/4 26.8 2.75 1.63 1.046 25 1 33.5 3.25 2.42 1.039 32 1 1/4 42.3 3.25 ﹢12 3.13 1.039 40 1 1/2 48.0 3.50 ﹣15 3.84 1.036 50 2 60.0 3.50 4.88 1.036 65 2 1/2 75.5 3.75 6.64 1.034 80 3 88.5 4.00 8.34 1.032 100 4 114.0 4.00 10.85 1.032 125 5 140.0 4.00 13.42 1.028 150 6 165.