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1、美製牙無屑攻牙底孔值 美製粗、細牙螺紋 (非圓絲攻 ) (單位：mm) 螺紋標稱 3B 級螺紋用下孔徑2B 級螺紋用下孔徑 精度最小最大 (咬合率 ) 精度最小最大 (咬合率 ) No 2-56UNC RH3 1.952.01 (100 65%) RH41.962.02 (100 65%) No 3-48UNC RH3 2.232.31 (100 65%) RH42.252.32 (100 65%) No 4-40UNC RH3 2.502.58 (100 70%) RH52.522.60 (100 70%) No 5-40UNC RH3 2.832.91 (100 70%) RH52.862
2、.93 (100 70%) No 6-32UNC RH3 3.063.14 (100 75%) RH53.093.17 (100 75%) No 8-32UNC RH4 3.743.82 (100 75%) RH63.763.84 (100 75%) No 10-24UNC RH4 4.244.32 (100 80%) RH64.264.35 (100 80%) No 12-24UNC RH4 4.904.96 (100 85%) RH64.925.01 (100 80%) 1/4-20UNC RH4 5.645.74 (100 80%) RH65.665.76 (100 80%) 5/16-
3、18UNC RH5 7.157.24 (100 85%) RH77.187.26 (100 80%) 3/8-16UNC RH5 8.638.73 (100 85%) RH78.668.78 (100 80%) 7/16-14UNC RH5 10.08 10.19 (100 85%) RH710.1110.25 (100 80%) 1/2-13UNC RH6 11.60 11.68 (100 90%) RH811.6211.78 (100 80%) 9/16-12UNC RH8 13.11 13.24 (100 85%) RH1013.1413.27 (100 85%) 5/8-11UNC R
4、H8 14.58 14.67 (100 90%) RH1114.6214.76 (100 85%) 3/4-10UNC RH9 17.63 17.74 (100 90%) RH1217.6717.88 (100 80%) 7/8-9UNC RH9 20.64 20.75 (100 90%) RH1220.6820.85 (100 85%) 1-8UNC RH10 23.61 23.74 (100 90%) RH1323.6523.84 (100 85%) No 2-64UNF RH2 1.972.03 (100 65%) RH31.982.04 (100 65%) No 3-56UNF RH3
5、 2.282.34 (100 65%) RH42.292.35 (100 65%) No 4-48UNF RH3 2.562.63 (100 70%) RH42.572.64 (100 70%) No 5-44UNF RH3 2.872.94 (100 70%) RH42.882.95 (100 70%) No 6-40UNF RH3 3.163.22 (100 75%) RH53.193.26 (100 70%) No 8-36UNF RH4 3.793.86 (100 75%) RH53.803.88 (100 75%) No 10-32UNF RH4 4.404.46 (100 80%)
6、 RH54.414.48 (100 80%) No 12-28UNF RH4 4.995.06 (100 80%) RH55.005.08 (100 80%) 1/4-28UNF RH4 5.855.92 (100 80%) RH55.865.93 (100 80%) 5/16-24UNF RH5 7.367.43 (100 85%) RH67.387.49 (100 80%) 3/8-24UNF RH5 8.959.02 (100 85%) RH68.969.05 (100 80%) 7/16-20UNF RH5 10.41 10.49 (100 85%) RH710.4410.54 (10
7、0 80%) 1/2-20UNF RH5 12.00 12.05 (100 90%) RH712.0212.12 (100 80%) 9/16-18UNF RH7 13.53 13.58 (100 90%) RH913.5513.66 (100 80%) 5/8-18UNF RH7 15.11 15.17 (100 90%) RH915.1415.25 (100 80%) 3/4-16UNF RH7 18.18 18.25 (100 90%) RH1018.2218.32 (100 85%) 7/8-14UNF RH8 21.23 21.27 (100 95%) RH1121.2721.38 (100 85%) 1-12UNF RH9 24.24 24.32 (100 90%) RH1224.2824.41 (100 85%) 備注“UNC“( 粗牙) “UNF“( 細牙)