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DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

China DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

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DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

MOQ： 900kg
Price： Negotiation
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Payment Terms	L/C, T/T
Supply Ability	500TON/MONTH
Delivery Time	30DAYS
Packaging Details	25KG/CTN,36CTN/PALLET or small packing
Standard	DIN6921
Material	Carbon Steel
Size	M5-M20
Finish	ZP YZP HDG BLACK
Grade	4.8 6.8 8.8-12.8ect
Packing	Carton and pallet or according to the customer's requirement
Sample	Free Sample
Thread	Mushroom head square neck
Lead time	Per on order quantity
Type	Hexagon Head
Advantage	we can manufacture according to client design,OEM / ODM / customized service provided
Oem	yes,welcome
Brand Name	QBH
Model Number	DIN6921
Certification	ISO9001
Place of Origin	CHINA

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Product Details
Company Details

Product Specification


Payment Terms	L/C, T/T	Supply Ability	500TON/MONTH
Delivery Time	30DAYS	Packaging Details	25KG/CTN,36CTN/PALLET or small packing
Standard	DIN6921	Material	Carbon Steel
Size	M5-M20	Finish	ZP YZP HDG BLACK
Grade	4.8 6.8 8.8-12.8ect	Packing	Carton and pallet or according to the customer's requirement
Sample	Free Sample	Thread	Mushroom head square neck
Lead time	Per on order quantity	Type	Hexagon Head
Advantage	we can manufacture according to client design,OEM / ODM / customized service provided	Oem	yes,welcome
Brand Name	QBH	Model Number	DIN6921
Certification	ISO9001	Place of Origin	CHINA
High Light	8.8 Stainless Steel Flange Bolts Metric ，DIN 6921 Stainless Steel Flange Bolts Metric ，CL10.9 Metric Flange Head Bolts

DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

Specification

Choose these Class 10.9 steel screws for high-stress applications, such as valves, pumps, motors,

and automotive suspension systems. They are at least 25% stronger than medium-strength steel

screws. The flange distributes pressure where the screw meets the surface, eliminating the need for a

separate washer. Head height includes the flange. Length is measured from under the flange.

Black-phosphate steel screws are mildly corrosion resistant in dry environments. Zinc yellow-

chromate plated steel screws resist corrosion in wet environments.

Screws that meet ISO 898-1 or SAE J1199 comply with specifications and testing requirements for

material quality. Screws that meet ASME B18.2.3.9M or DIN 6921 comply with specifications for

dimensional standards.

DIN 6921 - Hexagon flange bolts metric

Current norm: DIN EN 1665

Legend:

d2 - the inner diameter of the ring
b - length of the thread (at least)
l - length of bolt
d - the nominal diameter of the thread
k - head height
s - size hex head turnkey

Makings:QBH

Steel: 4.6,8.8,10.9
Stainless: A2, A4
Plastic: -
Non Ferrous: -
Thread: 6g

Table according to DIN 6921:

Tdread		M5	M6	M8	M10	M12	(M14)	M16	M20
size d		-	-	M8 x 1	M10 x 1,25	M12 x 1,5	(M14x1,5)	M16 x 1,5	M20 x 1,5
size d		-	-	-	(M10 x 1)	(M10 x 1,25)	-	-	-
P		0,8	1	1,25	1,5	1,75	2	2	2,5
C	Min.	1	1,1	1,2	1,5	1,8	2,1	2,4	3
da	Min.	5	6	8	10	12	14	16	20
da	Max.	5,75	6,75	8,75	10,8	13	15,1	17,3	21,6
dc	Max.	11,8	14,2	17,9	21,8	26	29,9	34,5	42,8
dw	Min.	9,8	12,2	15,8	19,6	23,8	27,6	31,9	39,9
e	Min.	8,79	11,05	14,38	16,64	20,03	23,36	26,75	32,95
h	Max.	6,2	7,3	9,4	11,4	13,8	15,9	18,3	22,4
m	Min.	4,7	5,7	7,6	9,6	11,6	13,3	15,3	18,9
m´	Min.	2,2	3,1	4,5	5,5	6,7	7,8	9	11,1
s	Nominal size =max.	8	10	13	15	18	21	24	30
s	Min.	7,78	9,78	12,73	14,73	17,73	20,67	23,67	29,16
r	Max.	0,3	0,36	0,48	0,6	0,72	0,88	0,96	1,2

Tab2

Thread d			M5		M6		M8		M10		M12		M14		M16		M 20
			-		-		M8 x 1		M10 x 1,25		M12 x 1,5		M14 x 1,5		M16 x 1,5		M20 x 1,5
			-		-		-		(M10 x 1)		(M12 x 1,25)		-		-		-
l			Shank lengtds
l			Shank lengtds
nominal dimension	min.	max.	ls min.	lg max	ls min.	lg max	ls min.	lg max	ls min.	lg max	ls min.	lg max	ls min.	lg max	ls min.	lg max	ls min.	lg max
10	9,71	10,29	-	2,4
12	11,65	12,35	-	2,4	-	3
16	15,65	16,35	-	2,4	-	3	-	4
20	19,58	20,42	-	4	-	3	-	4	-	4,5
25	24,58	25,42	5	9	2	7	-	4	-	4,5	-	5,3
30	29,58	30,42	10	14	7	12	-	8	-	4,5	-	5,3	-	6
35	34,5	35,5	15	19	12	17	6,75	13	-	9	-	5,3	-	6	-	6
40	39,5	40,5	20	24	17	22	11,75	18	6,5	14	-	10	-	6	-	6	-	7,5
45	44,5	45,5	25	29	22	27	16,75	23	11,5	19	6,25	15	-	11	-	6	-	7,5
50	49,5	50,5	30	34	27	32	21,75	28	16,5	24	11,25	20	6	16	-	12	-	7,5
55	54,4	55,6			32	37	26,75	33	21,5	29	16,25	25	11	21	7	17	-	9
60	59,4	60,6			37	42	31,75	38	26,5	34	21,25	30	16	26	12	22	-	14
65	64,4	65,5					36,75	43	31,5	39	26,25	35	21	31	17	27	6,5	19
70	69,4	70,6					41,75	48	36,5	44	31,25	40	26	36	22	32	11,5	24
80	79,4	80,6					51,75	58	46,5	54	41,25	50	36	46	32	42	21,5	34
90	89,3	90,7							56,5	64	51,25	60	46	56	42	52	31,5	44
100	99,3	100,7							66,5	74	61,25	70	56	66	52	62	41,5	54
110	109,3	110,7									71,25	80	66	76	62	72	51,5	54
120	119,3	120,7									81,25	90	76	86	72	82	61,5	74
130	129,2	130,8											80	90	76	86	65,5	78
140	139,2	140,8											90	100	86	96	75,5	88
150	149,2	150,8													96	106	85,5	98
160	159,2	160,8													106	116	95,5	108
180	179,2	180,8															115,5	128
200	199	201															135,5	148

Process flow

Cold forging

Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ thread rolling ➨make heat treatment(if need) ➨ Finish ➨ Packing

Hot forging

Cutting material ➨ hot forging ➨ turning ➨ shrink diameter(half thread) ➨thread rolling ➨ make heat treatment(if need) ➨ Finish ➨ Packing

Product Grade

Class4.8 Class5.8 Class6.8 Class8.8 Class10.9 Class12.9

NO.	Mechanical or physical property		Property class
			4.6	4.8	5.6	5.8	6.8	8.8		9.8	10.9	12.9/12.9
			4.6	4.8	5.6	5.8	6.8	D≤16mm^a	d＞16mm^b	d≤16mm	10.9	12.9/12.9
1	Tensile strength R_m,Mpa	nom.^c	400		500		600	800		900	1000	1200
1	Tensile strength R_m,Mpa	max.	400	420	500	520	600	800	830	900	1040	1220
2	Lower yield strength R_eL,Mpa	nom.^c	240	——	300	——	——	——	——	——	——	——
2	Lower yield strength R_eL,Mpa	max.	240	——	300	——	——	——	——	——	——	——
3	Stress at 0,2 % nonproportional elongation R_p0.2,Mpa	nom.^c	——	——	——	——	——	640	640	720	900	1080
3	Stress at 0,2 % nonproportional elongation R_p0.2,Mpa	max.	——	——	——	——	——	640	660	720	940	1100
4	Stress at 0,0048 d non-proportional elongation for full-size fasteners R_p^f,Mpa	nom.^c	——	320	——	400	480	——	——	——	——	——
4		max.	——	340^e	——	420^e	480^e	——	——	——	——	——
5	Stress under proof load S_p^f,Mpa	nom.	225	310	280	380	440	580	600	650	830	970
5	Proof S_p,nom/R_{eL min} Or strength S_p,nom/R_p0.2min Or rati S_p,nom/R_{pf min}		0.94	0.91	0.93	0.9	0.92	0.91	0.91	0.9	0.88	0.88
6	Percentage elongation after fracture for machined test pieces,A,%	min.	22	-—	20	——	——	12	12	10	9	8
7	Percentage reduction of area after fracture for machined test pieces,Z,%	min.	——					52		48	48	44
8	Elongation after fracture for full-size fasteners,A_f	min.	——	0.24	——	0.22	0.2	——	——	——	——	——
9	Head soundness		No fracture
10	Vickers hardness, HV, F≥98N	min.	120	130	155	160	190	250	255	290	320	385
10	Vickers hardness, HV, F≥98N	max.	220^g				250	320	335	360	380	435
11	Brinell hardness, HBW ,F=30D²	min.	114	124	147	152	181	238	242	276	304	366
11	Brinell hardness, HBW ,F=30D²	max.	209^g				238	304	318	342	361	414
12	Rockwell hardness,HRB , HRB	min.	67	71	79	82	89
	Rockwell hardness,HRB , HRB	max.	95^g				99.5
	Rockwell hardness, HRC	min.	——					22	23	28	32	39
	Rockwell hardness, HRC	max.	——					32	34	37	39	44
13	Surface hardness HV 0.3	max.	——					h			h,j	h,j
14	Height of non-decarburized thread zone,E,mm	min.	——					1/2H₁			2/3H₁	3/4H₁
14	Depth of complete decarburization in the thread,G,mm	max.	——					0.015
15	Reduction of hardness after retempering,HV	max.	——					20
16	Breaking torque, M_B,N·m	min.	——					in accordance with ISO 898-7
17	Impact strength, K_V^K,I,J	min.	——		27	——		27	27	27	27	m
18	Surface integrity in accordance with		ISO 6157-1ⁿ									ISO 6157-3
a Values do not apply for structural bolting. b For structural bolting d W M12. c Nominal values are specified only for the purpose of the designation system for property classes.See Clause 5. d In cases where the lower yield strength ReL cannot be determined, it is permissible to measure the stress at 0,2 % non-proportional elongation Rp0,2. e For the property classes 4.8, 5.8 and 6.8 the values for Rpf min are under investigation. The present values are given for calculation of the proof stress ratio only. They are not test values. f Proof loads are specified in Tables 5 and 7. g Hardness determined at the end of a fastener shall be 250 HV, 238 HB or 99,5 HRB maximum. h Surface hardness shall not be more than 30 Vickers points above the measured core hardness of the fastener when determination of both surface hardness and core hardness are carried out with HV 0,3. i Any increase in hardness at the surface which indicates that the surface hardness exceeds 390 HV is not acceptable. j Any increase in hardness at the surface which indicates that the surface hardness exceeds 435 HV is not acceptable. k Values are determined at a test temperature of −20 °C, see 9.14. l Applies to d W 16 mm. m Value for KV is under investigation. n Instead of ISO 6157-1, ISO 6157-3 may apply by agreement between the manufacturer and the purchaser.

Materials and Chemical compstition

1008

CHEMICAL COMPOSI %
C	Si	Mn	P	S	Cr	Ni	Cu	Al
0.06	0.06	0.33	0.013	0.003	0.01	0	0.01	0.028

1035

CHEMICAL COMPOSI %
C	Si	Mn	P	S	Cr	Ni	Cu
0.34	0.13	0.73	0.012	0.002	0.02	0.01	0.02

10B21

CHEMICAL COMPOSI %
C	Si	Mn	P	S	Cr	B
0.2	0.04	0.81	0.017	0.007	0.017	0.0021

1045

CHEMICAL COMPOSI %
C	Si	Mn	P	S	Cr	Ni	Cu
0.45	0.23	0.58	0.014	0.006	0.057	0.008	0.016

40CR

CHEMICAL COMPOSI %
C	Si	Mn	P	S	Cr	Ni	Cu
0.4	0.21	0.54	0.015	0.008	0.95	0.02	0.02

35CRMO

CHEMICAL COMPOSI %
C	Si	Mn	P	S	Cr	Ni	Cu	Mo
0.35	0.22	0.59	0.01	0.003	0.93	0.01	0.01	0.21

42CRMO

CHEMICAL COMPOSI %
C	Si	Mn	P	S	Cr	Ni	Cu	Mo
0.42	0.27	0.92	0.013	0.004	1.01	0.03	0.04	0.2

Finish

PLAIN ZP YZP BLACK HDG DACROMET GEOMET CHROME NICKEL AND SO ON

PACKING

QBH BULK

20-25KG/CTN,36CTNS/PALLET

20-30KG/BAGS,36BAGS/PALLET

ONE TON/BOXES

50KG/ IRON DRUM,12 IRON DRUMS/PALLET

QBH SMALL PACKING

Packing in small boxes according to customer’s requirements

Packing in plastic bag according to customer’s requirements

QBH PALLET TYPE

SOLID WOOD FUMIGATION PALLET

EURO Pallet

THREE SPLINT PALLET

WOODEN BOX

The advantages of QBH

QBH brand sales to the main quality assurance.
Years of export trade management, excellent service, word-of-mouth guarantee.
By working with TUV,escort for quality.
Customization of non-standard parts can be made according to customer's requirements and drawings.
For quality customers,we can provide a certain credit period.

Company Details

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from Quality China Factory

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Business Type:

Manufacturer,Trading Company,Seller 
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Year Established:

2014 
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Total Annual:

3000-4500
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Employee Number:

100~150 
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Ecer Certification：

Verified Supplier 

Jiaxing City Qunbang Hardware Co,ltd is a productiondesignsales and after-sales as one of the fasteners business,The company is located in HangjiaHu Plain,close to ShanghaiNingboZhapu ports.The geographical position is superior,the transportation is convenient,has created the nat... Jiaxing City Qunbang Hardware Co,ltd is a productiondesignsales and after-sales as one of the fasteners business,The company is located in HangjiaHu Plain,close to ShanghaiNingboZhapu ports.The geographical position is superior,the transportation is convenient,has created the nat...

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Jiaxing City Qunbang Hardware Co., Ltd
No.375,Tongle Road,Jiaxing City,Zhejiang Province,China
https://www.steelnutbolts.com/

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