Qbh Pumps Motors Automotive Suspension Systems Steam Valve Disk Valve-Stem Jam Lock Locking Flange Nut

• Customization: Available
• Material: Carbon Steel, Stainless Steel, Customized
• Type: Hexagon Head
• Model NO.: QBH-DIN6921
• Connection: Common Bolt
• Head Style: Hexagonal
• Standard: DIN, ANSI
• Grade: 4.8, 5.8, 6.8, 8.8, 10.9, 12.9, Ect
• Process: Cold Forming
• Sample: Free Sample
• Class/Grade: 4.8, 5.8, 6.8, 8.8, 10.9, 12.9, Ect
• Available Material: Carbon Steel, High Strength Steel
• Transport Package: 25kg Carton+900kg/Pallet
• Specification: M5~M24
• Trademark: QBH
• Origin: China
• HS Code: 7318160000
• Package Size: 26.00cm * 26.00cm * 14.00cm
• Package Gross Weight: 25.000kg

Product Description

Descriptions

A low carbon steel for general use. Zinc plated for moderate corrosion resistance. A tempered medium
carbon steel. Class 8.8 is hardened, but it is not as strong as class 10.9. It is commonly found in
automotive applications. Class 8.8 is similar to grade 5.
Class 10.9 is stronger than class 8.8, and is commonly found in high strength automotive applications.
Class 10.9 is similar to grade 8.

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.


Specifications
 

STYLE	DIN6921 Hex Head Flange Bolt with Serrations
STANDARD	DIN 6921
Brand	QBH
Web	qbfastener.en.made-in-china.com
Mod No.	QBH-DIN6921-S
SIZE	M5~M24
CLASS	4.8/5.8/6.8/8.8/10.9/12.9, Others: Customized
Coating	Zinc/BLACK/H.D.G
MATERIAL	Carbon Steel/Stainless steel
PACKING	bulk/ boxes in cartons, bulk in polybags/ buckets, etc.
PALLET	solid wood pallet, plywood pallet, ton box/bag, etc.

 

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
		-	-	-	(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
	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
	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
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
								D≤16mm^a	d>16mm^b	d≤16mm
1	Tensile strength Rm,Mpa	nom.^c	400		500		600	800		900	1000	1200
		max.	400	420	500	520	600	800	830	900	1040	1220
2	Lower yield strength ReL,Mpa	nom.^c	240	--	300	--	--	--	--	--	--	--
		max.	240	--	300	--	--	--	--	--	--	--
3	Stress at 0,2 % nonproportional elongation Rp0.2,Mpa	nom.^c	--	--	--	--	--	640	640	720	900	1080
		max.	--	--	--	--	--	640	660	720	940	1100
4	Stress at 0,0048 d non-proportional elongation for full-size fasteners Rp^f,Mpa	nom.^c	--	320	--	400	480	--	--	--	--	--
		max.	--	340^e	--	420^e	480^e	--	--	--	--	--
5	Stress under proof load Sp^f,Mpa	nom.	225	310	280	380	440	580	600	650	830	970
	Proof Sp,nom/ReL min Or strength Sp,nom/Rp0.2min Or rati Sp,nom/Rpf 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,Af	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
		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
		max.	209^g				238	304	318	342	361	414
12	Rockwell hardness,HRB , HRB	min.	67	71	79	82	89
		max.	95^g				99.5
	Rockwell hardness, HRC	min.	--					22	23	28	32	39
		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
	Depth of complete decarburization in the thread,G,mm	max.	--					0.015
15	Reduction of hardness after retempering,HV	max.	--					20
16	Breaking torque, MB,N·m	min.	--					in accordance with ISO 898-7
17	Impact strength, KV^K,I,J	min.	--		27	--		27	27	27	27	m
18	Surface integrity in accordance with		ISO 6157-1^n									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

Free Samples for Standard Fastener from Jiaxing City Qunbang Hardware
 We Promise:
1.High quality
2. Competitive price
3. The shortest delivery
4. The fastest response
5. The best service

FAQ
1.What's your experience like?

Our general manager has been engaged in the export of fasteners since 2005. 
Our team can provide you with professional fasteners selling and smooth export services.

2.How about your price?
High quality products with reasonable price. Please give me a inquire, We will quoted you a price for you refer at once.

3. How do you control your quality?
We require the quality control department to inspect every production link of each shipment. And we can provide you MTC and mill certificate when the goods is finished.

4.How about your delivery time?
General speaking, if the goods is in stock, we can delivery them with 2-5days, If the quantity is 1-2container, we can give you with 18-25days,if the quantity is more than 2 container and you are very urgent, we can let factory priority produce your goods.

5.What is your packing?
Our packing is 20-25kg for one carton,36 or 48pcs cartons for one pallet. One pallets is about 900-960kg, We also can make customer's logo on the cartons. Or we customized cartons according to customers' requirement.

6.What is your payment term?
We can accept T/T,LC for general order ,Paypal and Western union for small order or samples order. 


Awaiting for your kind inquiry! Thanks & best regards!
For more information:  http://qbfastener.en.made-in-china.com