| 
      
        | 螺釘公稱長度小于或等于(全螺紋) |  
        | Y
            ① | 最大值 | 粗牙 |  
                    | 細(xì)牙 |  
        | 螺釘公稱長度大于(全螺紋) |  
        | 螺釘公稱長度小于等于(全螺紋) |  
        | Y
            ② | 最大值 | 粗牙 |  
                    | 細(xì)牙 |  
        | 螺釘公稱長度大于(半螺紋) |  
        | b
            ③ | 最小值 |  | 
                    
                        | 1/4 | 5/16 | 11/32 | 3/8 | 13/32 | 1/2 | 9/16 | 5/8 | 3/4 | 15/16 | 1-1/8 | 1-5/16 | 1-1/2 |  
                        | 0.018 | 0.021 | 0.025 | 0.025 | 0.031 | 0.031 | 0.042 | 0.420 | 0.050 | 0.056 | 0.062 | 0.071 | 0.077 |  
                        | 0.016 | 0.018 | 0.021 | 0.023 | 0.025 | 0.028 | 0.031 | 0.036 | 0.036 | 0.042 | 0.042 | 0.050 | 0.050 |  
                        | 1/4 | 5/16 | 11/32 | 3/8 | 13/32 | 1/2 | 9/16 | 5/8 | 3/4 | 15/16 | 1-1/8 | 1-5/16 | 1-1/2 |  
                        | 5/8 | 3/4 | 7/8 | 1 | 1-1/16 | 1-3/16 | 1-3/8 | 1-9/16 | 1-13/16 | 1-7/8 | 2 | 2 | 2 |  
                        | 0.036 | 0.042 | 0.050 | 0.050 | 0.062 | 0.062 | 0.083 | 0.083 | 0.100 | 0.111 | 0.125 | 0.143 | 0.154 |  
                        | 0.032 | 0.036 | 0.042 | 0.046 | 0.050 | 0.056 | 0.062 | 0.071 | 0.071 | 0.083 | 0.083 | 0.100 | 0.100 |  
                        | 5/8 | 3/4 | 7/8 | 1 | 1-1/16 | 1-3/16 | 1-3/8 | 1-9/16 | 1-13/16 | 1-7/8 | 2 | 2 | 2 |  
                        | 0.520 | 0.590 | 0.670 | 0.750 | 0.830 | 0.980 | 1.140 | 1.300 | 1.500 | 1.500 | 1.500 | 1.500 | 1.500 |  |