- PF규격 규격(inch) 날장(mm)전장(mm)기준경(mm)관용나사 1/8-2819559.7288.74 1/4-19286213.15711.70 3/8-19286516.66215.21 1/2-14358020.95519.0 5/8-143582 22.911 3/4-14358526.44124.5 7/8-14 30.201 1"-11459533.24930.71 1/8-11(11 1/2) 37.897 1 1/4-11(11 1/2) 41.91039.41 1/2-11(11 1/2) 47.80345.31 3/4-11(11 1/2) 53.746 2"-11(11 1/2) 59.61457.1