転造下径表 | 株式会社ニッセー

ねじ転造を行う際の下径（素材径）表です。下記は計算値ですので、実際に転造を行う際は、事前にテストを行った上で決定して下さい。また、表にない種類のねじに関する下径はお問い合せください。
PDF形式はこちらから取得できます。

メートル並目ねじ

ねじの呼び			基準有効径	等級
ねじの呼び			基準有効径	4h	6g	8g
2	×	0.4	1.740	1.73-1.71	1.70-1.67	‐
2.2	×	0.45	1.908	1.90-1.88	1.87-1.83	‐
2.5	×	0.45	2.208	2.20-2.18	2.17-2.13	‐
3	×	0.6	2.610	‐	2.56-2.53	‐
3	×	0.5	2.675	2.67-2.64	2.63-2.60	‐
3.5	×	0.6	3.110	3.10-3.08	3.06-3.30	‐
4	×	0.75	3.513	‐	3.46-3.42	‐
4	×	0.7	3.545	3.54-3.51	3.49-3.45	‐
4.5	×	0.75	4.013	4.00-3.98	3.96-3.92	‐
5	×	0.9	4.415	-	4.36-4.31	‐
5	×	0.8	4.480	4.47-4.44	4.43-4.38	4.40-4.33
6	×	1	5.350	5.34-5.31	5.30-5.25	5.28-5.21
7	×	1	6.350	6.34-6.31	6.30-6.25	6.28-6.21
8	×	1.25	7.188	7.18-7.14	7.12-7.07	7.10-7.03
9	×	1.25	8.188	8.18-8.14	8.12-8.07	8.10-8.03
10	×	1.5	9.026	9.03-8.99	8.97-8.91	8.94-8.86
11	×	1.5	10.026	10.02-9.98	9.97-9.91	9.94-9.86
12	×	1.75	10.863	10.87-10.82	10.79-10.73	10.77-10.69
14	×	2	12.701	12.71-12.66	12.63-12.56	12.61-12.52
16	×	2	14.701	14.70-14.65	14.63-14.56	14.61-14.52
18	×	2.5	16.376	16.39-16.33	16.31-16.23	16.28-16.17
20	×	2.5	18.376	18.38-18.33	18.31-18.23	18.28-18.17
22	×	2.5	20.306	20.38-20.33	20.31-20.23	20.28-20.17
24	×	3	22.051	22.07-22.01	21.98-21.90	21.96-21.85
27	×	3	25.051	25.06-25.00	24.98-24.89	24.95-24.84
30	×	3.5	27.727	27.75-27.68	27.66-27.56	27.63-27.50
33	×	3.5	30.727	30.74-30.68	30.65-30.56	30.62-30.50
36	×	4	33.402	33.43-33.37	33.33-33.23	33.29-33.16
39	×	4	36.402	36.43-36.36	36.33-36.23	36.29-36.15
42	×	4.5	39.077	39.11-39.04	39.01-38.90	38.97-38.82
45	×	4.5	42.077	42.11-42.04	42.00-41.90	41.96-41.82
48	×	5	44.752	44.79-44.72	44.68-44.57	44.64-44.49
52	×	5	48.752	48.78-48.70	48.67-48.54	48.59-48.39
56	×	5.5	52.428	52.47-52.38	52.34-52.21	52.26-52.05
60	×	5.5	56.428	56.46-56.38	56.34-56.21	56.26-56.05
64	×	6	60.103	60.14-60.06	60.02-59.88	59.93-59.70
68	×	6	64.103	64.14-64.05	64.01-63.87	63.93-63.70

メートル細目ねじ

ねじの呼び			基準有効径	等級
ねじの呼び			基準有効径	4h	6g	8g
3	×	0.35	2.773	2.76-2.73	2.72-2.68	‐
3.5	×	0.35	3.273	3.26-3.23	3.22-3.18	-
4	×	0.5	3.675	3.66-3.63	3.61-3.57	-
4.5	×	0.5	4.175	4.16-4.13	4.11-4.07	-
5	×	0.5	4.675	4.66-4.63	4.61-4.57	-
5.5	×	0.5	5.175	5.16-5.13	5.11-5.07	-
6	×	0.75	5.513	5.50-5.47	5.45-5.41	-
7	×	0.75	6.513	6.50-6.47	6.45-6.41	-
8	×	1	7.350	7.34-7.30	7.29-7.24	7.72-7.20
8	×	0.75	7.513	7.49-7.46	7.45-7.40	7.43-7.36
9	×	1	8.350	8.34-8.30	8.29-8.24	8.27-8.20
9	×	0.75	8.513	8.49-8.46	8.45-8.40	8.43-8.36
10	×	1.25	9.188	9.18-9.14	9.12-9.07	9.10-9.03
10	×	1	9.350	9.34-9.30	9.28-9.23	9.26-9.19
10	×	0.75	9.513	9.50-9.46	9.45-9.40	-
11	×	1	10.350	10.34-10.30	10.28-10.23	10.26-10.19
11	×	0.75	10.513	10.50-10.46	10.45-10.40	-
12	×	1.5	11.026	11.02-10.97	10.95-10.89	10.93-10.85
12	×	1.25	11.118	11.17-11.13	11.12-11.06	11.08-10.98
12	×	1	11.350	11.33-11.29	11.27-11.21	11.25-11.17
14	×	1.5	13.026	13.02-12.97	12.95-12.89	12.93-12.85
14	×	1	13.350	13.34-13.30	13.27-13.21	13.25-13.17
15	×	1.5	14.026	14.02-13.97	13.95-13.89	13.93-13.85
15	×	1	14.305	14.33-14.29	14.27-14.21	14.25-14.17
16	×	1.5	15.026	15.01-14.97	14.95-14.89	14.93-14.85
16	×	1	15.350	15.33-15.29	15.27-15.21	15.25-15.17
17	×	1.5	16.026	16.01-15.97	15.96-15.89	15.91-15.80
17	×	1	16.350	16.33-16.29	16.28-16.22	16.24-16.15
18	×	2	16.701	16.70-16.65	16.62-16.54	16.59-16.48
18	×	1.5	17.026	17.01-16.96	16.93-16.86	16.91-16.81
18	×	1	17.350	17.32-17.28	17.26-17.20	17.24-17.16
20	×	2	18.701	18.70-18.65	18.62-18.54	18.59-18.48
20	×	1.5	19.026	19.01-18.96	18.92-18.85	18.90-18.80
20	×	1	19.350	19.32-19.28	19.26-19.20	19.24-19.16
22	×	2	20.701	20.69-20.64	20.61-20.53	20.58-20.47
22	×	1.5	21.026	21.00-20.96	20.92-20.85	20.90-20.80
22	×	1	21.35	21.32-21.28	21.26-21.20	21.24-21.16
24	×	2	22.701	22.69-22.63	22.60-22.52	22.57-22.46
24	×	1.5	23.026	23.00-22.95	22.92-22.85	22.90-22.80
24	×	1	23.350	2.333-23.29	23.26-23.20	23.24-23.16
25	×	2	23.701	23.69-23.63	23.60-23.52	23.57-23.46
25	×	1.5	24.026	24.00-23.95	23.93-23.85	23.90-23.80
25	×	1	24.350	24.32-24.28	24.26-24.20	24.24-24.16
26	×	1.5	25.026	25.00-24.95	24.93-24.85	24.90-24.80
27	×	2	25.701	25.69-25.64	25.62-25.53	25.57-25.44
27	×	1.5	26.026	26.00-25.95	25.93-25.85	25.90-25.80
27	×	1	26.350	26.33-26.29	26.28-26.22	26.24-26.16
28	×	2	26.701	26.69-26.63	26.60-26.52	26.57-26.46
28	×	1.5	27.026	27.00-26.95	26.93-26.85	26.90-26.80
28	×	1	27.350	27.32-27.28	27.26-27.20	27.24-27.16
30	×	3	28.051	28.06-27.99	27.97-27.87	27.91-27.76
30	×	2	28.701	28.68-28.63	28.60-28.52	28.57-28.46
30	×	1.5	29.026	29.00-28.95	28.93-28.85	28.90-28.80
30	×	1	29.350	29.32-29.28	29.26-29.20	29.24-29.16
32	×	2	30.701	30.68-30.63	30.59-30.51	30.56-30.45
32	×	1.5	31.026	31.00-30.95	30.93-30.85	30.90-30.80
33	×	3	31.051	31.05-30.99	30.97-30.87	30.91-30.75
33	×	2	31.701	31.69-31.63	31.62-31.53	31.57-31.44
33	×	1.5	32.026	32.00-31.95	31.93-31.85	31.90-31.79
35	×	1.5	34.026	34.00-33.95	33.93-33.85	33.90-33.79
36	×	3	34.051	34.05-33.99	33.97-33.87	33.91-33.75
36	×	2	34.701	34.68-34.63	34.59-34.51	34.56-34.45
36	×	1.5	35.026	35.00-34.95	34.93-34.85	34.90-34.79
38	×	1.5	37.026	37.00-36.95	36.93-36.85	36.90-36.79
39	×	3	37.051	37.05-36.99	36.96-36.86	36.91-36.75
39	×	2	37.701	37.68-37.63	37.61-37.53	37.56-37.43
39	×	1.5	38.026	38.01-37.96	37.94-37.87	37.90-37.78
40	×	3	38.051	38.05-37.99	37.96-37.86	37.90-37.75
40	×	2	38.701	38.68-38.63	38.59-38.51	38.56-38.45
40	×	1.5	39.026	39.00-38.95	38.93-38.85	38.90-38.79
42	×	4	39.402	39.42-39.35	39.32-39.21	39.25-39.08
42	×	3	40.051	40.05-39.999	39.96-39.86	39.90-39.75
42	×	2	40.701	40.68-40.62	40.59-40.51	40.56-40.44
42	×	1.5	41.026	41.00-40.95	40.93-40.85	40.90-40.79
45	×	4	42.402	42.42-42.35	42.32-42.20	42.25-42.07
45	×	3	43.051	43.05-42.98	42.96-42.86	42.90-42.75
45	×	2	43.701	43.68-43.63	43.59-43.51	43.56-43.44
45	×	1.5	44.026	44.00-43.95	43.93-43.85	43.90-43.79
48	×	4	45.402	45.41-45.34	45.31-45.19	45.24-45.05
48	×	3	46.051	46.04-45.98	45.95-45.85	45.89-45.72
48	×	2	46.701	46.68-46.62	46.59-46.50	46.56-46.44
48	×	1.5	47.026	47.00-46.95	46.93-46.85	46.90-46.79
50	×	3	48.051	48.04-47.98	47.95-47.85	47.89-47.72
50	×	2	48.701	48.68-48.62	48.59-48.50	48.56-48.44
50	×	1.5	49.026	49.00-48.95	48.92-48.85	48.89-48.79