常見電動攻牙機(jī)/攻牙機(jī)用美制標(biāo)準(zhǔn)螺紋系列
尺寸（英寸） 基園直徑 牙/英寸 （THREADS PER INCH ）
Series with graded pitches系列 series with constant pitches
系列1 系列2 普通 精 特精 4UN 6UN 8UN 12UN 16UN
0 0.0600 - 80 - - - - - -
1 0.0730 64 72 - - - - - -
2 0.0860 56 64 - - - - - -
3 0.0990 48 56 - - - - - -
4 0.1120 40 48 - - - - - -
5 0.1250 40 44 - - - - - -
6 0.1380 32 40 - - - - - -
8 0.1640 32 36 - - - - - -
10 0.1900 24 32 - - - - - -
12 0.2160 24 28 32 - - - - -
1/4 0.2500 20 28 32 - - - - -
5/16 0.3125 18 24 32 - - - - -
3/8 0.3750 16 24 32 - - - - UNC
7/16 0.4375 14 20 28 - - - - 16
1/2 0.5000 13 20 28 - - - - 16
9/16 0.5625 12 18 24 - - - UNC 16
5/8 0.6250 11 18 24 - - - 12 16
11/16 0.6875 - - 24 - - - 12 16
3/4 0.7500 10 16 20 - - - 12 UNF
13/16 0.8125 - - 20 - - - 12 16
7/8 0.8750 9 14 20 - - - 12 16
15/16 0.9375 - - 20 - - - 12 16
1 1.0000 8 12 20 - - UNC UNF 16
1 1/16 1.0625 - - 18 - - 8 12 16
1 1/8 1.1250 7 12 18 - - 8 UNF 16
1 3/16 1.1875 - - 18 - - 8 12 16
1 1/4 1.2500 7 12 18 - - 8 UNF 16
1 5/16 1.3125 - - 18 - - 8 12 16
1 3/8 1.3750 6 12 18 - UNC 8 UNF 16
1 7/16 1.4375 - - 18 - 6 8 12 16
1 1/2 1.5000 6 12 18 - UNC 8 UNF 16
1 9/16 1.5625 - - 18 - 6 8 12 16
1 5/8 1.6250 - - 18 - 6 8 12 16
1 11/16 1.6875 - - 18 - 6 8 12 16
13/4 1.7500 5 - - - 6 8 12 16
1 13/16 1.8125 - - - - 6 8 12 16
1 7/8 1.8750 - - - - 6 8 12 16
1 15/16 1.9375 - - - - 6 8 12 16
2 2.0000 4 1/2 - - - 6 8 12 16
2 1/8 2.1250 - - - - 6 8 12 16
2 1/4 2.2500 4 1/2 - - - 6 8 12 16
2 3/8 2.3750 - - - - 6 8