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ASTM A307A M6 20mm Hex Bolt Carbon Steel Material

Brand Name:QBH

Certification:ISO9001

Model Number:ANSI A307

Minimum Order Quantity:900kg

Delivery Time:30days

Payment Terms:L/C, T/T,OA

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Jiaxing City Qunbang Hardware Co., Ltd

Verified Supplier

Location: Jiaxing Zhejiang China

Address: No.375,Tongle Road,Jiaxing City,Zhejiang Province,China

Supplier`s last login times: within 29 hours

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Product Details Company Profile

Product Details

Hex bolts (six sided heads) are the industry standard for fasteners with forged heads. ASTM A307 grade A bolts, all SAE hex bolts, and several other common specifications require a standard (finished) hex head. For specifications such as A307 grade B, A325 and A490 that require a heavy hex pattern, refer to dimensional tolerances for heavy hex bolts or structural bolts.

Manufacturing

QBH Bolt manufactures hex bolts from 1/4″ diameter through 3″ diameter in most ASTM, AASHTO, and SAE specifications. Special tooling can be created to produce nonstandard head dimensions or bolt heads with your company’s name and/or logo.

High-Strength Grade 8 Steel Hex Head Screws

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. Grade 8 steel hex head screws are marked with six radial lines. Length is measured from under the head.

Zinc yellow-chromate plated steel screws resist corrosion in wet environments. Zinc-aluminum-coated steel screws are about five times as corrosion resistant as zinc yellow-chromate plated screws and have good resistance to salt water and acids. Also known as ultra coat and armor coat. To maintain corrosion resistance, use these screws with zinc-aluminum-coated nuts and washers.

Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance.

Screws that meet ASTM A354BD or SAE J429 comply with specifications and testing requirements for material quality. Screws that meet ASME B18.2.1 or ASME B18.6.3 comply with specifications for dimensional standards.

Product name	HEX BOLTS
Standard	ASTM A307A
Size	3/8"-2"
Class	Gr.A
Finish	Z.P., B.Z.P.,PLAIN, BLACK, H.D.G., dacromet, geomet, nickle plated, mechanical zinc plated,ect.
Packing	bulk/boxes in cartons, bulk in poly bags/-buckets, etc
Pallet	solid wood pallet, plywood pallet, ton box/bag, etc.
Mechanical Properties:	GB/T 3098.1

Max body length : 800mm/32in

Screw Thread
d

PP	UNC
	UNF
	8-UN
d_s	max
	min
s	max
	min
e	max
	min
k	max
	min
r	max
	min
b	L≤6
	L＞6

20	18	16	14	13	11	10	9	8	7	7	6
28	24	24	20	20	18	16	14	12	12	12	12
-	-	-	-	-	-	-	-	-	8	8	8
0.26	0.324	0.388	0.452	0.515	0.642	0.768	0.895	1.022	1.149	1.277	1.404
0.237	0.298	0.36	0.421	0.482	0.605	0.729	0.852	0.976	1.098	1.223	1.345
0.438	0.5	0.562	0.625	0.75	0.938	1.125	1.312	1.5	1.688	1.875	2.062
0.425	0.484	0.544	0.603	0.725	0.906	1.088	1.269	1.45	1.631	1.812	1.994
0.505	0.577	0.650	0.722	0.866	1.083	1.299	1.516	1.732	1.949	2.165	2.382
0.484	0.552	0.620	0.687	0.826	1.033	1.240	1.447	1.653	1.859	2.066	2.273
0.188	0.235	0.268	0.316	0.364	0.444	0.524	0.604	0.7	0.78	0.876	0.94
0.15	0.195	0.226	0.272	0.302	0.378	0.455	0.531	0.591	0.658	0.749	0.81
0.030	0.030	0.030	0.030	0.030	0.060	0.060	0.060	0.090	0.090	0.090	0.090
0.010	0.010	0.010	0.010	0.010	0.020	0.020	0.020	0.030	0.030	0.030	0.030
0.7500	0.8750	1.0000	1.1250	1.2500	1.5000	1.7500	2.0000	2.2500	2.5000	2.7500	3.0000
1.0000	1.1250	1.2500	1.3750	1.5000	1.7500	2.0000	2.2500	2.5000	2.7500	3.0000	3.2500

Screw Thread
d

PP	UNC
	UNF
	8-UN
d_s	max
	min
s	max
	min
e	max
	min
k	max
	min
r	max
	min
b	L≤6
	L＞6

6	-	5	-	4-1/2	4	4	4	4	4	4	4
12	-	-	-	-	-	-	-	-	-	-	-
8	8	8	8	8	8	8	8	8	8	8	8
1.531	1.658	1.785	1.912	2.039	2.559	2.827	3.081	3.335	3.589	3.858	4.111
1.47	1.591	1.716	1.839	1.964	2.461	2.711	2.961	3.21	3.461	3.726	3.975
2.25	2.438	2.625	2.812	3	3.75	4.125	4.5	4.875	5.25	5.625	6
2.175	2.356	2.538	2.719	2.9	3.625	3.988	4.35	4.712	5.075	5.437	5.8
2.598	2.815	3.031	3.248	3.464	4.330	4.763	5.196	5.629	6.062	6.495	6.928
2.480	2.616	2.893	3.099	3.306	4.133	4.546	4.959	5.372	5.786	6.198	6.612
1.036	1.116	1.196	1.276	1.388	1.708	1.869	2.06	2.251	2.38	2.572	2.764
0.902	0.978	1.054	1.13	1.175	1.479	1.632	1.815	1.936	2.057	2.241	2.424
0.090	0.090	0.120	0.120	0.120	0.190	0.190	0.190	0.190	0.190	0.190	0.190
0.030	0.030	0.040	0.040	0.040	0.060	0.060	0.060	0.060	0.060	0.060	0.060
3.2500	3.5000	3.7500	4.0000	4.2500	5.2500	5.7500	6.2500	6.7500	7.2500	7.7500	8.2500
3.5000	3.7500	4.0000	4.2500	4.5000	5.5000	6.0000	6.5000	7.0000	7.5000	8.0000	8.5000

Mechanical property :SAEJ429

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

Grade2 Grade5 Grade8

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

Our Services

Professional Manufacturer: All of our Fastener are designed and manufactured according to buyers'
specification and performance.
Quality is guaranteed: Durability testing and critical technical design to enhance fasteners lifetime.
Cost effective: Competitive prices with professional factory supply
Perfect fastening solution with 15+ years experiences to solve your problem: Wide range of parts selection.
Customized Ideal Fasteners: customized services according to the samples and drawings offered.

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. How do you let me trust you.

Jiaxing City Qunbang Hardware Co.,ltd hs its own right of import and export,QBH trademark in China,United States,European Union have been registered.At the same time,you can also check the registration information of our company in the China industry and Commerce system.

2. How about your price.

We will be based on different markets,for different quality and quantity,tailor-made prices for customers,in order to achieve win-win goal.

3. How do you control your quality.

Incoming quality contral( IQC)→Process Quality control(PQC)→Output quality control(OQC),and the random samples is sent to TUV for testing.If the customer received the goods and found quality problems,QBH company promises to be responsible for returning money or replenishing the goods

4. Could you provide free samples?

For new customer, We can provide free samples for standard fastener, But the clients will pay the express

charges. For old customer, We will send you free samples and pay express charges by ourself.

5. Do you accept small order?

QBH company can accept small orders if we have them in stock.Generally speaking,the stock probability of stainless steel fasteners is higher than that of carbon steel fasteners.

6. How about your delivery time

What we pursure is the high efficiency movement pattern,the stainless steel fastener delivery time about 15days,the carbon steel fastener will it about 30days

7. What is your packing.

Usually 25KG/carbon,36CTNS on the pallets,or 20-30kg/Bags,then on the pallet,QBH company personalized packagingis also available,like 10PCS/plastic bag or 10pcs/box,it can print some information

such as LOGO and pattern of customers.

8. What is your payment term

Normally,our terms of payment are TT and L/C,if we cooperate for a long time,we can reach the point of mutual trust,and fully support our customers to become bigger and stronger in the local market.

Not only in the price concessions,but also in the payment can also be made on credit,Specific credit sales time needs to be negotiated separately.

Company Profile

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 natural superiority for the export.

The company mainly produces high-strength fasteners business, bolts and nuts are the main,the main standard are DIN/ANSIASME/JIS/UNI/ISO/AS/BS/GB and so on.The product massively applies in the bridgeroadthe petroleum pipeline facilitythe wind power generation and steel structure project. Carbon steel bolts mainly have 4.8、5.8、6.8、8.8、10.9、12.9,nuts mainly have 4、6、8、10,the main material of stainless steel fastener is 201304316.QBH from its establishment to he present,after ten years of development,it is equipped with perfect testing equipment,and SGS and TUV have a good cooperation,each batch of products is accompanied by a 3.1 or 3.2 certificate,further escort the quality of the company.

In 2017,we registered the trademark “QBH” in the CHINA、EU、United States,and has six fastener product patents,has obtained the Zhejiang Province science and technology small and medium-sized enterprise certificate as well as the ISO9001:2000 cerfiticate.With the continuous development and expansion of the company,as well as customer demand for product diversification,on the basis of its original production,in order to further enhance the potential for cooperation with customers,as well as to provide competitive prices.Starting in 2015,QBH has taken part in several fastener enterprises one after another,the product variety is more abundant and the price is more advantageous,and the quality can also be well controlled. QBH has always been to provide customers with efficient and convenient service and quality products,and create a pleasant trading process for customers for the mission,deeply participate in customer construction projects and make progress together with customers,this means that we need to provide better and more cost-effictive solutions,so as to help customers stand out from the competition.

QBH promises to always provide you with excellent quality,efficient service and very competitive prices.We believe that the cooperation between us is not only based on business,but also hope that we can open new markets on the basis of win-win situation.And thank all the customers in the past to give us great support and help,make us grow up gradually,at the same time also hope that in the nere future,and you can establish new business relations.

ASTM A307A M6 20mm Hex Bolt Carbon Steel Material

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