螺丝的图纸上只知道是M6，那螺距什么的怎么知道

公称直径螺距(粗牙)平面切削牙朱咀挤压牙攻牙后内孔
M1.00.250.75±0.020.88±0.020.78
M1.10.250.85±0.020.98±0.020.88
M1.20.250.95±0.021.08±0.020.98
M1.40.31.1±0.021.25±0.021.14
M1.60.351.25±0.021.43±0.021.32
M1.70.351.35±0.031.53±0.031.47
M1.80.351.45±0.031.63±0.031.52
M2.00.41.6±0.031.8±0.031.67
M2.20.451.75±0.031.98±0.031.83
M2.30.41.90±0.032.10±0.031.97
M2.50.452.10±0.032.28±0.032.13
M2.60.452.2±0.032.38±0.032.23
M30.52.5±0.042.75±0.042.59
M3.50.62.9±0.043.2±0.043.01
M40.73.3±0.053.65±0.053.42
M4.50.753.8±0.053.92
M50.84.2±0.054.6±0.054.33
M615±0.055.5±0.055.15
M716±0.056.5±0.056.15
M81.256.8±0.057.38±0.057.00
公称直径螺距(细牙)平面切削牙朱咀挤压牙攻牙后内孔
M1.00.20.80±0.020.90±0.02
M1.10.20.90±0.021.00±0.02
M1.20.21.00±0.021.10±0.02
M1.40.21.20±0.021.30±0.02
M1.60.21.40±0.021.30±0.02
M1.70.21.45±0.021.55±0.02
M1.80.21.60±0.021.70±0.02
M2.00.251.75±0.021.88±0.02
M2.20.251.95±0.022.08±0.02
M2.30.252.05±0.022.15±0.02
M2.50.352.20±0.022.32±0.02
M2.60.352.20±0.022.42±0.02
M30.352.70±0.022.72±0.02
M3.50.353.20±0.023.32±0.02
M40.73.50±0.053.75±0.05
M4.50.54.00±0.054.25±0.05
M50.54.50±0.054.75±0.05
M5.50.55.00±0.055.20±0.05
M60.55.50±0.055.75±0.05
M60.755.30±0.055.63±0.05
M70.56.50±0.056.75±0.05
M70.756.30±0.056.63±0.05
M80.57.50±0.057.75±0.05
M80.757.30±0.057.63±0.05
M81.007.00±0.057.50±0.05