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GB /T 16674.1 – 2004 – Bu lông long đen

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GB /T 16674.1 – 2004 – Bu lông long đen

Screw Thread				M5	M6	M8	M10	M12	(M14)	M16
P		Pitch		0.8	1	1.25	1.5	1.75	2	2
b		ref.	L≤125	16	18	22	26	30	34	38
b		ref.	125＜L≤200	/	/	28	32	36	40	44
c		min		1	1.1	1.2	1.5	1.8	2.1	2.4
d_a		Form F	max	5.7	6.8	9.2	11.2	13.7	15.7	17.7
d_a		Form U	max	6.2	7.5	10	12.5	15.2	17.7	20.5
d_c		max		11.4	13.6	17	20.8	24.7	28.6	32.8
d_s		max		5	6	8	10	12	14	16
d_s		min		4.82	5.82	7.78	9.78	11.73	13.73	15.73
d_u		max		5.5	6.6	8.8	10.8	12.8	14.8	17.2
d_w		min		9.4	11.6	14.9	18.7	22.5	26.4	30.6
e		min		7.59	8.71	10.95	14.26	16.5	19.86	23.15
k		max		5.6	6.9	8.5	9.7	12.1	12.9	15.2
k₁		min		2.3	2.9	3.8	4.3	5.4	5.6	6.8
f		max		1.44	1.6	2.1	2.1	2.1	2.1	3.2
r₁		min		0.2	0.25	0.4	0.4	0.6	0.6	0.6
r₂		max		0.3	0.4	0.5	0.6	0.7	0.9	1
r₃		max		0.25	0.26	0.36	0.45	0.54	0.63	0.72
r₃		min		0.1	0.11	0.16	0.2	0.24	0.28	0.32
r₄		Ref.		4	4.4	5.7	5.7	5.7	5.7	8.8
s		max		7	8	10	13	15	18	21
s		min		6.78	7.78	9.78	12.73	14.73	17.73	20.67
V		max		0.15	0.2	0.25	0.3	0.35	0.45	0.5
V		min		0.05	0.05	0.1	0.15	0.15	0.2	0.25
Length of Thread b				–	–	–	–	–	–	–

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