출처: 메카피아유니파이 가는나사 드릴 아래 구멍(하혈경)나사의 호칭드릴 직경No.0-80UNF1.25No.1-72UNF1.55No.2-64UNF1.85No.3-56UNF2.1No.4-48UNF2.4No.5-44UNF2.7No.6-40UNF2.9No.8-36UNF3.5No.10-32UNF4.1No.12-28UNF4.61 / 4-28UNF5.55 / 16-24UNF6.93 / 8-24UNF8.57 / 16-20UNF9.91 / 2-20UNF11.59 / 16-18UNF12.95 / 8-18UNF14.53 / 4-16UNF17.57 / 8-14UNF20.51-12UNF23.21-1 / 8-12UNF26.51-1 / 4-12UNF29.51-3 / 8-12UNF32.81-1 / 2-12UNF36