美制螺纹UN/UNC/UNF螺纹底孔直径

螺纹底孔直径攻丝/螺纹铣加工

2026年1月14日由

cuttingtools

螺纹底孔直径攻丝/螺纹铣加工

UN螺纹

螺纹 Ø P Gg/1“	D1 最小 mm 2B/3B	D1 最大 mm 2B	建议钻头直径 Ø mm
1 1/8–8 UN	25.138	25.962	25.4
1 1/4–8 UN	28.313	29.126	28.5
1 3/8–8 UN	31.488	32.123	32
1 1/2–8 UN	34.663	35.456	35
1 5/8–8 UN	37.838	38.623	38.1
1 3/4–8 UN	41.013	41.79	41.5
1 7/8–8 UN	44.188	44.957	44.45
2–8 UN	47.363	48.125	48
2 1/4–8 UN	53.713	54.462	54

螺纹 Ø P Gg/1“	D1 最小 mm 2B/3B	D1 最大 mm 2B	建议钻头直径 Ø mm
1–64 UNC	1.425	1.582	1.55
2–56 UNC	1.694	1.872	1.85
3–48 UNC	1.941	2.146	2.1
4–40 UNC	2.156	2.385	2.35
5–40 UNC	2.487	2.697	2.65
6–32 UNC	2.642	2.896	2.85
8–32 UNC	3.302	3.531	3.5
10–24 UNC	3.683	3.962	3.9
12–24 UNC	4.343	4.597	4.5
1/4–20 UNC	4.976	5.268	5.1
5/16–18 UNC	6.411	6.734	6.6
3/8–16 UNC	7.805	8.164	8
7/16–14 UNC	9.149	9.55	9.4
1/2–13 UNC	10.584	11.013	10.8
9/16–12 UNC	11.996	12.456	12.2
5/8–11 UNC	13.376	13.868	13.5
3/4–10 UNC	16.299	16.833	16.5
7/8–9 UNC	19.169	19.748	19.5
1–8 UNC	21.963	22.598	22.25
1 1/8–7 UNC	24.648	25.348	25
1 1/4–7 UNC	27.823	28.524	28
1 1/2–6 UNC	33.518	34.295	34
1 3/4–5 UNC	38.951	39.814	39.5
2–4.5 UNC	44.689	45.598	45

螺纹 Ø P Gg/1“	D1 最小 mm 2B/3B	D1 最大 mm 2B	建议钻头直径 Ø mm
0–80 UNF	1.181	1.306	1.25
1–72 UNF	1.473	1.613	1.55
2–64 UNF	1.755	1.913	1.85
3–56 UNF	2.024	2.197	2.15
4–48 UNF	2.271	2.459	2.4
5–44 UNF	2.55	2.741	2.7
6–40 UNF	2.819	3.023	2.95
8–36 UNF	3.404	3.607	3.5
10–32 UNF	3.962	4.166	4.1
12–28 UNF	4.496	4.724	4.6
1/4–28 UNF	5.367	5.58	5.5
5/16–24 UNF	6.792	7.038	6.9
3/8–24 UNF	8.379	8.626	8.5
7/16–20 UNF	9.738	10.03	9.9
1/2–20 UNF	11.326	11.618	11.5
9/16–18 UNF	12.761	13.084	12.9
5/8–18 UNF	14.348	14.671	14.5
3/4–16 UNF	17.33	17.689	17.5
7/8–14 UNF	20.262	20.663	20.4
1–12 UNF	23.109	23.569	23.25
1 1/8–12 UNF	26.284	26.744	26.5
1 1/4–12 UNF	29.459	29.919	29.5
1 3/8–12 UNF	32.634	33.094	33
1 1/2–12 UNF	35.809	36.269	36.1

公制细牙粗牙螺纹(M / MF) 推荐攻丝底孔尺寸

螺纹底孔直径，攻丝/螺纹铣加工，推荐攻丝底孔尺寸表