Hexagon Socket Set Screws (Excerpt from JIS B 1177 2007)

Nominal screw diameter　d			M1.6	M2	M2.5	M3	M4	M5	M6	M8	M10	M12	M16	M20	M25
P			0.35	0.4	0.45	0.5	0.7	0.8	1	1.25	1.5	1.75	2	2.5	3
dp	Max.		0.80	1.00	1.50	2.00	2.50	3.5	4.0	5.5	7.00	8.50	12.00	15.00	18.00
	Min.		0.55	0.75	1.25	1.75	2.25	3.2	3.7	5.2	6.64	8.14	11.57	14.57	17.57
df			Approximately equivalent to the root diameter of male screw
e ＊3	Min.		0.809	1.011	1.454	1.733	2.303	2.873	3.443	4.583	5.723	6.863	9.149	11.429	13.716
s ＊4	Nominal diameter		0.7	0.9	1.3	1.5	2	2.5	3	4	5	6	8	10	12
	Max.		0.724	0.913	1.300	1.58	2.08	2.58	3.08	4.095	5.14	6.14	8.175	10.175	12.212
	Min.		0.710	0.887	1.275	1.52	2.02	2.52	3.02	4.020	5.02	6.02	8.025	10.025	12.032
t	Min. ＊5		0.7	0.8	1.2	1.2	1.5	2	2	3	4	4.8	6.4	8	10
	Min. ＊6		1.5	1.7	2	2	2.5	3	3.5	5	6	8	10	12	15

Float point
ℓ			(Reference) Rough mass (kg) per 1,000 pieces (density: 7.85 kg/dm3)
Nominal length	Min.	Max.
2	1.8	2.2	0.021	0.029
2.5	2.3	2.7	0.025	0.037	0.063
3	2.8	3.2	0.029	0.044	0.075	0.1
4	3.76	4.24	0.037	0.059	0.1	0.14	0.22
5	4.76	5.24	0.046	0.074	0.125	0.18	0.3	0.44
6	5.76	6.24	0.054	0.089	0.15	0.22	0.38	0.56	0.76
8	7.71	8.29	0.07	0.119	0.199	0.3	0.54	0.8	1.11	1.89
10	9.71	10.29		0.148	0.249	0.38	0.7	1.04	1.46	2.52	3.78
12	11.65	12.35			0.299	0.46	0.86	1.28	1.81	3.15	4.78	6.8
16	15.65	16.35				0.62	1.18	1.76	2.51	4.41	6.78	9.6	16.3
20	19.58	20.42					1.49	2.24	3.21	5.67	8.76	12.4	21.5	32.3
25	24.58	25.42						2.84	4.09	7.25	11.2	15.9	28	42.6	57
30	29.58	30.42							4.97	8.82	13.7	19.4	34.6	52.9	72
35	34.5	35.5								10.4	16.2	22.9	41.4	63.2	87
40	39.5	40.5								12	18.7	26.4	47.7	73.5	102
45	44.5	45.5									21.2	29.9	54.2	83.8	117
50	49.5	50.5									23.7	33.4	60.7	94.1	132
55	54.4	55.6										36.8	67.3	104	147
60	59.4	60.6										40.3	73.7	115	162

Half point
ℓ			(Reference) Rough mass (kg) per 1,000 pieces (density: 7.85 kg/dm3)
Nominal length	Min.	Max.
2	1.8	2.2	0.019	0.029
2.5	2.3	2.7	0.025	0.037	0.063
3	2.8	3.2	0.029	0.044	0.075	0.1
4	3.76	4.24	0.037	0.059	0.1	0.14	0.23
5	4.76	5.24	0.046	0.074	0.125	0.18	0.305	0.42
6	5.76	6.24	0.054	0.089	0.15	0.22	0.38	0.54	0.74
8	7.71	8.29	0.07	0.119	0.199	0.3	0.53	0.78	1.09	1.88
10	9.71	10.29		0.148	0.249	0.38	0.68	1.02	1.44	2.51	3.72
12	11.65	12.35			0.299	0.46	0.83	1.26	1.79	3.14	4.73	6.7
16	15.65	16.35				0.62	1.13	1.74	2.49	4.4	6.73	9.5	15.7
20	19.58	20.42					1.4	2.22	3.19	5.66	8.72	12.3	20.9	31.1
25	24.58	25.42						2.82	4.07	7.24	11.2	15.8	27.4	41.4	55.2
30	29.58	30.42							4.94	8.81	13.7	19.3	33.9	51.7	70.3
35	34.5	35.5								10.4	16.2	22.7	40.4	62	85.3
40	39.5	40.5								12	18.7	26.2	46.9	72.3	100
45	44.5	45.5									21.2	29.7	53.3	82.6	115
50	49.5	50.5									23.6	33.2	59.8	92.6	130
55	54.4	55.6										36.6	66.3	103	145
60	59.4	60.6										40.1	72.8	114	160

・Recommended nominal lengths are within the thick lines.
・P indicates thread pitch.
・e min = 1.14 s min
・Gauge inspection of e and s is according to JIS B 1016.
・(d) applies to screw nominal lengths in shaded areas.
・(e) applies to screw nominal lengths not in shaded areas.