常用规格有：
3/16-24x1/4 3/16-24x15/16 3/16-24x1x3/8 3/16-24x1x1/2 3/16-24x1x5/8 3/16-24x1x3/4 3/16-24x1x1 3/16-24x1x1-1/4 3/16-24x1 x1-1/2
1/4-20x3/8 1/4-20x1/2 1/4-20x5/8 1/4-20x3/4 1/4-20x1 1/4-20x1-1/4 1/4-20x1-1/2 1/4-20x1-3/4 1/4-20x2
5/16-18x1/2 5/16-18x5/8 5/16-18x3/4 5/16-18x1 5/16-18x1-1/4 5/16-18x1-1/2 5/16-18x1-3/4 5/16-18x2 5/16-18x2 5/16-18x2-1/2 5/16-18x3
3/8-16x5/8 3/8-16x3/4 3/8-16x1 3/8-16x1-1/4 3/8-16x1-3/4 3/8-16x2 3/8-16x2-1/2
1/2-12x3/4 1/2-12x1 1/2-12x1-1/4 1/2-12x1-1/2 1/2-12x1-3/4 1/2-12x2 1/2-12x2-1/2 1/2-12x3 1/2-12x3-1/2 1/2-12x4
