High strength Heavy hex nut A563 , 2H nut
1. Material: Carbon steel-T40, T45, Q235 or according to requirement
a
                    Stinless steel-SS304 A2, SS316 A4 etc. Alloy steel
2 Size: m5-m100
3. Grade: 4.8 5.6 8.8 10.9 etc. A2-70, A4-80 .Or according to requires
4. Finish: zinc-plated, galcanized, black, Dacromet, plain, nickel ect
5.Packaging & Delivery
Packaging Details:25kg one caton 36catons one pallet oe as customers' requiement.
Delivery Detail:5-20 days
Â
| Name | High strength Heavy hex nut A563 , 2H nut |
| Place of Origin | Jiaxing, Zhengjiang, China |
| Size | M3-M100 1/4-4" or non-standard as request&design |
| Finish | plain, zinc plated, black oxide, hot dip galv.et |
| Head Type | hex,flange, hex cap head |
| Material | Carbon steel, stainless steel, alloys steel   etc. |
| Grade | a2,a4,4.8,8.8,10.9,12.9.etc,A2-70, A4-80 ect |
| Standard | GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS etc |
| Non-standards | OEM is available, according to drawing or samples |
| Samples | Samples are free. |
| Package | Bulk in master cartons, then on pallets, or according to customers' requirement. |
| Payment |  T/T or L/C |
About us:
Jiaxing Goshen Hardware Co Limited, formerly Haina Fastener Co.,Ltd, established in China Mainland with the High-Quality strategy and marketing philosophy inherited from the holding company in the willing to supply better service for the domestic and overseas client.
Mainly Product;
BOLT : din933, din931, din419, din558, din7990, din6922, ASME/ANSI B 18.2.1 , ASME/ANSI BÂ Â Â Â Â Â Â Â 18.2.3.1M,GB, BSW, ISO Hex bolt , carriage bolt, heavy hex bolt, flange head bolt, achor bolt ect
Rod : threaded rod din976, threaded bar din975 stud bolt, B7 stud bolt ect
Nut : din934, hex heavy hex nut, 2H nut, din555, flange bolt, cap nut, nylon nut, ect
Screw :hex screw, self drilling screw, self tapping screw, drywall screw, pan head screw, button head screw, machine screw, chipboard screw,furniture screw,wood screw, ect
 washer :flat washer, spring washer, lock washer,square washer,spring lock washer, plain washer ect
Customized:
If you have drawing or samples, we can as your requirment to product. Welcome to your early reply.
Promise:
1. Hight quality
2. Competitive price
3. The shortest delivery
4. The fastest response
5. Best serviceÂ
High strength Heavy hex nut A563 , 2H nut
1. Material: Carbon steel-T40, T45, Q235 or according to requirement
a
                    Stinless steel-SS304 A2, SS316 A4 etc. Alloy steel
2 Size: m5-m100
3. Grade: 4.8 5.6 8.8 10.9 etc. A2-70, A4-80 .Or according to requires
4. Finish: zinc-plated, galcanized, black, Dacromet, plain, nickel ect
5.Packaging & Delivery
Packaging Details:25kg one caton 36catons one pallet oe as customers' requiement.
Delivery Detail:5-20 days
Â
| Name | High strength Heavy hex nut A563 , 2H nut |
| Place of Origin | Jiaxing, Zhengjiang, China |
| Size | M3-M100 1/4-4" or non-standard as request&design |
| Finish | plain, zinc plated, black oxide, hot dip galv.et |
| Head Type | hex,flange, hex cap head |
| Material | Carbon steel, stainless steel, alloys steel   etc. |
| Grade | a2,a4,4.8,8.8,10.9,12.9.etc,A2-70, A4-80 ect |
| Standard | GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS etc |
| Non-standards | OEM is available, according to drawing or samples |
| Samples | Samples are free. |
| Package | Bulk in master cartons, then on pallets, or according to customers' requirement. |
| Payment |  T/T or L/C |
About us:
Jiaxing Goshen Hardware Co Limited, formerly Haina Fastener Co.,Ltd, established in China Mainland with the High-Quality strategy and marketing philosophy inherited from the holding company in the willing to supply better service for the domestic and overseas client.
Mainly Product;
BOLT : din933, din931, din419, din558, din7990, din6922, ASME/ANSI B 18.2.1 , ASME/ANSI BÂ Â Â Â Â Â Â Â 18.2.3.1M,GB, BSW, ISO Hex bolt , carriage bolt, heavy hex bolt, flange head bolt, achor bolt ect
Rod : threaded rod din976, threaded bar din975 stud bolt, B7 stud bolt ect
Nut : din934, hex heavy hex nut, 2H nut, din555, flange bolt, cap nut, nylon nut, ect
Screw :hex screw, self drilling screw, self tapping screw, drywall screw, pan head screw, button head screw, machine screw, chipboard screw,furniture screw,wood screw, ect
 washer :flat washer, spring washer, lock washer,square washer,spring lock washer, plain washer ect
Customized:
If you have drawing or samples, we can as your requirment to product. Welcome to your early reply.
Promise:
1. Hight quality
2. Competitive price
3. The shortest delivery
4. The fastest response
5. Best serviceÂ
Pyrimidine series intermediates
Pyrimidine, also known as 1,3-diazepine, is a heterocyclic compound with the chemical formula C4H4N2. Pyrimidine is formed by replacing 2 carbons in the meta-position of benzene with 2 nitrogen atoms, and is a diazine. Like pyridine, pyrimidine retains its aromaticity.
Introduction
Name: Pyrimidine
Molecular formula: C4H4N2
Molar mass: 80.09 g/mol
Density: 1.016 g/ml
Melting point: 20 - 22 °C
Boiling point: 123 - 124 °C
CAS Number: 289-95-2
EINECS Number: 206-026-0
SMILES: C1=NC=NC=C1
Application
(1) Anticancer drugs. In the selection of anticancer substances, it is crucial that there are significant differences between tumor tissues and normal tissues, that is, they have a certain ability to recognize target cells. Porphyrin compounds have special affinity for cancer cells due to their unique structures, and they can selectively stay in cancer tissues. The research of it as a localizing agent and a drug for diagnosis and treatment of cancer has already aroused great interest of chemists, medical scientists and biologists. 5-Fluorouracil is a widely used anti-metabolite and anti-tumor drug in clinic. It has inhibitory effect on various tumors. It has good clinical effect in the treatment of colorectal cancer, gastric cancer, breast cancer and other cancers. Polyesters, polyester hydrocarbons, polyester amides, deoxyribonucleic acid, furans, 5-fluorouracil derivatives linked to nitroxide radicals all have antitumor effects.
(2) Anti-AIDS drugs. Viral diseases have become one of the most harmful diseases to human beings, especially the spread of AIDS, which has aroused widespread concern. There are many kinds of anti-AIDS drugs that have been approved by the US Food Administration (FDA), many of which are nucleoside compounds. In order to reduce the toxicity of drugs and improve their efficacy, scientists have begun to turn their attention to the study of non-nucleoside compounds, and such compounds have become the focus of antiviral drug research.
Synthetic method
Pyrimidines and various substituted pyrimidines are synthesized in a variety of ways. For example, barbituric acid (2,4,6-trihydroxypyrimidine) can be obtained by the condensation of urea and diethyl malonate under the action of sodium alkoxide. Barbituric acid and phosphorus oxychloride are heated together to obtain 2,4,6-trichloropyrimidine, which reacts with sodium methoxide to obtain trimethoxypyrimidine. Chloropyrimidines react with ammonia or primary and secondary amines to generate the corresponding aminopyrimidines. The derivatives of pyrimidine, cytosine, uracil and thymine, are the constituent parts of nucleic acid and deoxynucleic acid, and the pyrimidine part in the vitamin B1 molecule is a 4-amino-2-methyl-5-pyrimidine methyl group. Many oral long-acting sulfa drugs are derivatives of pyrimidine and its isomers.
The 2,4-dichloropyrimidine is prepared by reduction reaction in the presence of palladium, magnesium oxide and activated carbon.
Pyrimidine Series Intermediates,2-Chloro-5-Methylpyrimidine,Intermediate 4 6-Dichloro-2-Methylpyrimidine,2 4-Dichloro-5-Methylpyrimidine
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