China DIN6921 Flange Bolt Carbon Steel Black Oxide Grade 8.8 10.9 12.9 manufacturers and suppliers

DIN6921 Flange Bolt Carbon Steel Black Oxide Grade 8.8 10.9 12.9

Short Description:

Standard: DIN6921

Product Name: Flange Bolt

Key Words: DIN6921, Flange Bolt, Half Thread Flange Bolt

Size: M3-M42

Material: 45#, 35K, 10B21, 40Cr, 35CrMo

Stength Grade: 8.8, 10.9, 12.9

Surface Treatment: Black oxide

Thread Length: Full Thread/ Half Thread

Thread Type: Coarse/Fine

Packing: Bag/Carton/Wooden case

Other Features: Offer customized head mark

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d			M5	M6	M8	M10	M12	M14	M16	M20
P	Pitch	Coarse	0.8	1	1.25	1.5	1.75	2	2	2.5
		Fine thread1	/	/	1	1.25	1.5	1.5	1.5	1.5
		Fine thread2	/	/	/	1	1.25	/	/	/
b	L≤125		16	18	22	26	30	34	38	46
	125＜L≤200		/	/	28	32	36	40	44	52
	L＞200		/	/	/	/	/	/	57	65
c	Min		1	1.1	1.2	1.5	1.8	2.1	2.4	3
da	Type A	Max	5.7	6.8	9.2	11.2	13.7	15.7	17.7	22.4
da	Type B	Max	6.2	7.4	10	12.6	15.2	17.7	20.7	25.7
dc	Max		11.8	14.2	18	22.3	26.6	30.5	35	43
ds	Max		5	6	8	10	12	14	16	20
ds	Min		4.82	5.82	7.78	9.78	11.73	13.73	15.73	19.67
du	Max		5.5	6.6	9	11	13.5	15.5	17.5	22
dw	Min		9.8	12.2	15.8	19.6	23.8	27.6	31.9	39.9
e	Min		8.71	10.95	14.26	16.5	17.62	19.86	23.15	29.87
f	Max		1.4	2	2	2	3	3	3	4
k	Max		5.4	6.6	8.1	9.2	11.5	12.8	14.4	17.1
k1	Min		2	2.5	3.2	3.6	4.6	5.1	5.8	6.8
r1	Min		0.25	0.4	0.4	0.4	0.6	0.6	0.6	0.8
r2	Max		0.3	0.4	0.5	0.6	0.7	0.9	1	1.2
r3	Min		0.1	0.1	0.15	0.2	0.25	0.3	0.35	0.4
r4	≈		3	3.4	4.3	4.3	6.4	6.4	6.4	8.5
s	Max=Nominal		8	10	13	15	16	18	21	27
s	Min		7.78	9.78	12.73	14.73	15.73	17.73	20.67	26.67

Detail description

Flange bolts. According to the thread classification of Metric standard and ASME standard, according to the head shape it has flat head and concave head. Flat bottom and serrated bottom can be assigned according to the appearance of the bottom of the head. The common grade is 8.8, 10.9 and 12.9, and the American grade is Grade 5 and Grade 8. Materials are 304 stainless steel, 316 stainless steel, 35K, 45# steel, 10B21, 40Cr, 35CrMo, etc. And we also provide customized service, the head side and flange diameter and head mark can be customized, the minimum order weight is 1000 kg or equivalent quantity.

Flange bolt is composed of hexagonal head and flange plate, its "support area to stress area word ratio" is greater than the ordinary bolt, so this bolt can bear higher preload, anti-loose performance is also better, so it is widely used in automobile engines, heavy machinery and other products.