统一螺纹(UN)系列螺纹丝套规格、型式尺寸及安装参数表(3-3)
（1 1/8-7UNC～2 1/4-12UN）
规格 公称直径(mm) 螺距(mm) 公称长度 钻孔深度 攻丝深度 钻孔直径(mm)
L1(mm) L2(mm) 切削丝锥 挤压丝锥
d p xd L(mm) min min min   max min   max
1 1/8-7UNC 1.1250-7 28.575 3.63 1d 28.6 44.90 35.83 29.30 29.66 31.37 31.73
28.575 3.63 1.5d 42.9 59.19 50.12 29.30 29.66 31.37 31.73
28.575 3.63 2d 57.2 73.48 64.41 29.30 29.66 31.37 31.73
28.575 3.63 2.5d 71.4 87.77 78.69 29.30 29.66 31.37 31.73
28.575 3.63 3d 85.7 102.05 92.98 29.30 29.66 31.37 31.73
28.575 3.63 3.5d 100.0 116.34 107.27 29.30 29.66 31.37 31.73
28.575 3.63 4d 114.3 130.63 121.56 29.30 29.66 31.37 31.73
1 1/8-8UN 1.1250-8 28.575 3.18 1d 28.6 42.86 34.93 29.21 29.52 31.02 31.33
28.575 3.18 1.5d 42.9 57.15 49.21 29.21 29.52 31.02 31.33
28.575 3.18 2d 57.2 71.44 63.50 29.21 29.52 31.02 31.33
28.575 3.18 2.5d 71.4 85.73 77.79 29.21 29.52 31.02 31.33
28.575 3.18 3d 85.7 100.01 92.08 29.21 29.52 31.02 31.33
28.575 3.18 3.5d 100.0 114.30 106.36 29.21 29.52 31.02 31.33
28.575 3.18 4d 114.3 128.59 120.65 29.21 29.52 31.02 31.33
1 1/8-12UNF 1.1250-12 28.575 2.12 1d 28.6 38.10 32.81 29.00 29.21 30.20 30.41
28.575 2.12 1.5d 42.9 52.39 47.10 29.00 29.21 30.20 30.41
28.575 2.12 2d 57.2 66.68 61.38 29.00 29.21 30.20 30.41
28.575 2.12 2.5d 71.4 80.96 75.67 29.00 29.21 30.20 30.41
28.575 2.12 3d 85.7 95.25 89.96 29.00 29.21 30.20 30.41
28.575 2.12 3.5d 100.0 109.54 104.25 29.00 29.21 30.20 30.41
28.575 2.12 4d 114.3 123.83 118.53 29.00 29.21 30.20 30.41
1 1/8-16UN 1.1250-16 28.575 1.59 1d 28.6 35.72 31.75 28.89 29.05 29.80 29.95
28.575 1.59 1.5d 42.9 50.01 46.04 28.89 29.05 29.80 29.95
28.575 1.59 2d 57.2 64.29 60.33 28.89 29.05 29.80 29.95
28.575 1.59 2.5d 71.4 78.58 74.61 28.89 29.05 29.80 29.95
28.575 1.59 3d 85.7 92.87 88.90 28.89 29.05 29.80 29.95
28.575 1.59 3.5d 100.0 107.16 103.19 28.89 29.05 29.80 29.95
28.575 1.59 4d 114.3 121.44 117.48 28.89 29.05 29.80 29.95
1 1/8-18UNEF 1.1250-18 28.575 1.41 1d 28.6 34.93 31.40 28.86 29.00 29.66 29.80
28.575 1.41 1.5d 42.9 49.21 45.68 28.86 29.00 29.66 29.80
28.575 1.41 2d 57.2 63.50 59.97 28.86 29.00 29.66 29.80
28.575 1.41 2.5d 71.4 77.79 74.26 28.86 29.00 29.66 29.80
28.575 1.41 3d 85.7 92.08 88.55 28.86 29.00 29.66 29.80
28.575 1.41 3.5d 100.0 106.36 102.83 28.86 29.00 29.66 29.80
28.575 1.41 4d 114.3 120.65 117.12 28.86 29.00 29.66 29.80
1 3/16-12UN 1.1880-12 30.163 2.12 1d 30.2 39.69 34.40 30.58 30.80 __ __
30.163 2.12 1.5d 45.2 54.77 49.48 30.58 30.80 __ __
30.163 2.12 2d 60.3 69.85 64.56 30.58 30.80 __ __
30.163 2.12 2.5d 75.4 84.93 79.64 30.58 30.80 __ __
30.163 2.12 3d 90.5 100.01 94.72 30.58 30.80 __ __
30.163 2.12 3.5d 105.6 115.09 109.80 30.58 30.80 __ __
30.163 2.12 4d 120.7 130.18 124.88 30.58 30.80 __ __
1 3/16-18UNEF 1.1880-18 30.163 1.41 1d 30.2 36.51 32.98 30.44 30.58 __ __
30.163 1.41 1.5d 45.2 51.59 48.07 30.44 30.58 __ __
30.163 1.41 2d 60.3 66.68 63.15 30.44 30.58 __ __
30.163 1.41 2.5d 75.4 81.76 78.23 30.44 30.58 __ __
30.163 1.41 3d 90.5 96.84 93.31 30.44 30.58 __ __
30.163 1.41 3.5d 105.6 111.92 108.39 30.44 30.58 __ __
30.163 1.41 4d 120.7 127.00 123.47 30.44 30.58 __ __
1 1/4-7UNC 1.2500-7 31.750 3.63 1d 31.8 48.08 39.01 32.47 32.83 __ __
31.750 3.63 1.5d 47.6 63.95 54.88 32.47 32.83 __ __
31.750 3.63 2d 63.5 79.83 70.76 32.47 32.83 __ __
31.750 3.63 2.5d 79.4 95.70 86.63 32.47 32.83 __ __
31.750 3.63 3d 95.3 111.58 102.51 32.47 32.83 __ __
31.750 3.63 3.5d 111.1 127.45 118.38 32.47 32.83 __ __
31.750 3.63 4d 127.0 143.33 134.26 32.47 32.83 __ __
1 1/4-8UN  1.2500-7 31.750 3.18 1d 31.8 46.04 38.10 32.38 32.70 __ __
31.750 3.18 1.5d 47.6 61.91 53.98 32.38 32.70 __ __
31.750 3.18 2d 63.5 77.79 69.85 32.38 32.70 __ __
31.750 3.18 2.5d 79.4 93.66 85.73 32.38 32.70 __ __
31.750 3.18 3d 95.3 109.54 101.60 32.38 32.70 __ __
31.750 3.18 3.5d 111.1 125.41 117.48 32.38 32.70 __ __
31.750 3.18 4d 127.0 141.29 133.35 32.38 32.70 __ __
1 1/4-12UNF 1.2500-12 31.750 2.12 1d 31.8 41.28 35.98 32.17 32.38 __ __
31.750 2.12 1.5d 47.6 57.15 51.86 32.17 32.38 __ __
31.750 2.12 2d 63.5 73.03 67.73 32.17 32.38 __ __
31.750 2.12 2.5d 79.4 88.90 83.61 32.17 32.38 __ __
31.750 2.12 3d 95.3 104.78 99.48 32.17 32.38 __ __
31.750 2.12 3.5d 111.1 120.65 115.36 32.17 32.38 __ __
31.750 2.12 4d 127.0 136.53 131.23 32.17 32.38 __ __
1 1/4-16UN 1.2500-16 31.750 1.59 1d 31.8 38.89 34.93 32.07 32.22 __ __
31.750 1.59 1.5d 47.6 54.77 50.80 32.07 32.22 __ __
31.750 1.59 2d 63.5 70.64 66.68 32.07 32.22 __ __
31.750 1.59 2.5d 79.4 86.52 82.55 32.07 32.22 __ __
31.750 1.59 3d 95.3 102.39 98.43 32.07 32.22 __ __
31.750 1.59 3.5d 111.1 118.27 114.30 32.07 32.22 __ __
31.750 1.59 4d 127.0 134.14 130.18 32.07 32.22 __ __
1 1/4-18UNEF 1.2500-18 31.750 1.41 1d 31.8 38.10 34.57 32.03 32.17 __ __
31.750 1.41 1.5d 47.6 53.98 50.45 32.03 32.17 __ __
31.750 1.41 2d 63.5 69.85 66.32 32.03 32.17 __ __
31.750 1.41 2.5d 79.4 85.73 82.20 32.03 32.17 __ __
31.750 1.41 3d 95.3 101.60 98.07 32.03 32.17 __ __
31.750 1.41 3.5d 111.1 117.48 113.95 32.03 32.17 __ __
31.750 1.41 4d 127.0 133.35 129.82 32.03 32.17 __ __
1 5/16-12UN 1.3130-12 33.338 2.12 1d 33.3 42.86 37.57 33.76 33.97 __ __
33.338 2.12 1.5d 50.0 59.53 54.24 33.76 33.97 __ __
33.338 2.12 2d 66.7 76.20 70.91 33.76 33.97 __ __
33.338 2.12 2.5d 83.3 92.87 87.58 33.76 33.97 __ __
33.338 2.12 3d 100.0 109.54 104.25 33.76 33.97 __ __
33.338 2.12 3.5d 116.7 126.21 120.91 33.76 33.97 __ __
33.338 2.12 4d 133.4 142.88 137.58 33.76 33.97 __ __
1 5/16-18UNEF 1.3130-18 33.338 1.41 1d 33.3 39.69 36.16 33.62 33.76 __ __
33.338 1.41 1.5d 50.0 56.36 52.83 33.62 33.76 __ __
33.338 1.41 2d 66.7 73.03 69.50 33.62 33.76 __ __
33.338 1.41 2.5d 83.3 89.69 86.17 33.62 33.76 __ __
33.338 1.41 3d 100.0 106.36 102.83 33.62 33.76 __ __
7.938 1.41 3.5d 27.8 34.13 30.60 8.22 8.36 __ __
33.338 1.41 4d 133.4 139.70 136.17 33.62 33.76 __ __
1 3/8-6UNC 1.3750-6 34.925 4.23 1d 34.9 53.98 43.39 35.77 36.19 __ __
34.925 4.23 1.5d 52.4 71.44 60.85 35.77 36.19 __ __
34.925 4.23 2d 69.9 88.90 78.32 35.77 36.19 __ __
34.925 4.23 2.5d 87.3 106.36 95.78 35.77 36.19 __ __
34.925 4.23 3d 104.8 123.83 113.24 35.77 36.19 __ __
34.925 4.23 3.5d 122.2 141.29 130.70 35.77 36.19 __ __
34.925 4.23 4d 139.7 158.75 148.17 35.77 36.19 __ __
1 3/8-8UN 1.3730-8 34.925 3.18 1d 34.9 49.21 41.28 35.56 35.87 __ __
34.925 3.18 1.5d 52.4 66.68 58.74 35.56 35.87 __ __
34.925 3.18 2d 69.9 84.14 76.20 35.56 35.87 __ __
34.925 3.18 2.5d 87.3 101.60 93.66 35.56 35.87 __ __
34.925 3.18 3d 104.8 119.06 111.13 35.56 35.87 __ __
34.925 3.18 3.5d 122.2 136.53 128.59 35.56 35.87 __ __
34.925 3.18 4d 139.7 153.99 146.05 35.56 35.87 __ __
1 3/8-12UNF 1.3730-12 34.925 2.12 1d 34.9 44.45 39.16 35.35 35.56 __ __
34.925 2.12 1.5d 52.4 61.91 56.62 35.35 35.56 __ __
34.925 2.12 2d 69.9 79.38 74.08 35.35 35.56 __ __
34.925 2.12 2.5d 87.3 96.84 91.55 35.35 35.56 __ __
34.925 2.12 3d 104.8 114.30 109.01 35.35 35.56 __ __
34.925 2.12 3.5d 122.2 131.76 126.47 35.35 35.56 __ __
34.925 2.12 4d 139.7 149.23 143.93 35.35 35.56 __ __
1 3/8-16UN 1.3730-16 34.925 1.59 1d 34.9 42.07 38.10 35.24 35.40 __ __
34.925 1.59 1.5d 52.4 59.53 55.56 35.24 35.40 __ __
34.925 1.59 2d 69.9 76.99 73.03 35.24 35.40 __ __
34.925 1.59 2.5d 87.3 94.46 90.49 35.24 35.40 __ __
34.925 1.59 3d 104.8 111.92 107.95 35.24 35.40 __ __
34.925 1.59 3.5d 122.2 129.38 125.41 35.24 35.40