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DIN933 Stainless Steel SS304 A2-70 Hex Head Bolts Cup Screw Bolts

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DIN933 Stainless Steel SS304 A2-70 Hex Head Bolts Cup Screw Bolts

Brand Name : HNF
Model Number : M8-M80
Certification : ISO9001:2008
Place of Origin : Zhejiang
MOQ : 1000 PCS
Price : Negotiation
Payment Terms : L/C, T/T, Western Union, MoneyGram
Supply Ability : 500TON / per month
Delivery Time : 10-30DAYS
Packaging Details : Cartons+Pallets
Name : DIN933 Stainaless Steel Hexagon head bolts
Size : M8-M80
Material : Stainless steel
Standard : DIN933
Production Process : Hot forging
Class : A2-70
Type : Hexagen head
Thread : full Thread
Alias : hexagon screw head bolts
Sample : free
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DIN933 Stainless steel SS304 A2-70 Hex head bolts cup screw bolts


Stainless steel usually refers to steel that is resistant to air, water, acid, alkali salt or other corrosive substances.According to the composition of the alloy, the emphasis is on rust and acid resistance.Some of the steel is not rustproof, but not necessarily acid, and acid-resistant steel is usually stainless.The main products used in the production fasteners are austenitic stainless steel, which is often referred to as austenitic stainless steel in People's Daily life.We use stainless steel fasteners, the raw material mainly USES the austenite 302, 304, 316 and "low nickel" 201.

It is often thought that the magnet adsorbs stainless steel, verifying its advantages and disadvantages, and does not absorb the magnetism.The aspirant is magnetic and is considered to be counterfeit.In fact, this is a very one-sided and unreal error identification method.There are many kinds of stainless steel screws. At room temperature, the structure can be divided into several types:

1.Austenitic body type: 304, 321, 316, 310, etc.

2.Martensite or iron body type: such as 430, 420, 410, etc.

Austenite is not magnetic or weak magnetic, martensite or ferrite is magnetic.

Often used as decorative tube plate mostly austenite size of 304 stainless steel material, generally is non-magnetic or weak magnetic, but caused by smelting chemical composition may also appear different magnetic fluctuations or processing status, but it cannot be considered a counterfeit or substandard, what reason is this?

Mentioned above austenite is non-magnetic or weak magnetic, martensite and ferrite is magnetic, due to improper smelting composition segregation or heat treatment, can cause a small amount of martensite in the austenitic stainless steel 304 or ferrite organization.In this way, the 304 stainless steel will have a weak magnetism.

In addition, 304 stainless steel is cold-processed, the structure of the structure will also be transformed to martensite, the greater the deformation degree of cold processing, the more martensitic transformation, the greater the magnetism of steel.As a number of steel strip, the production of Φ 76 tube, no obvious magnetic induction, Φ 9.5 tube production.It is obvious that the deformation of the rectangular tube is larger than that of the circular tube, especially the corner part, and the deformation is more intense.

In order to completely eliminate the magnetic properties of 304 steel caused by the above reasons, stable austenite tissue can be restored by high temperature solid solution treatment, thereby eliminating magnetism.

In particular, due to the above causes of 304 stainless steel magnetic, and other stainless steel materials, such as 430, carbon steel magnetic completely is not the same level, that is to say 304 magnetic always shows the weak magnetic steel.

This tells us that if the stainless steel is weak or not magnetic, it should be judged as 304 or 316.If it is as magnetic as carbon steel, it shows strong magnetism because it is not made of 304.

Application field

ItemStainless Steel hex head Bolts
Standard:DIN933,DIN931DIN6923.DIN603 DIN912 DIN444,DIN315,ASME B18.2.3,ASME B18.5
Other Standard:DIN933-1987,EN24017-1992,ISO4017-2001,EN24017-1997,ISO4017-2011
Type:Flange Bolt,Carriage bolt, Guardrail bolt,Socket Bolt,T bolt,Square bolt and Wing bolt
Sample:For free
MaterialStainless Steel: SS201 SS304/SS304L SS316/SS316L SS904L
Steel Grade: Gr.4.8,5.8,8.8,10.9,12.9; SAE: Gr.2,5,8;
Finishing:Zinc(Yellow,White,Blue,Black,Colour),Hop Dip Galvanized(HDG),Black Oxide,Geomet,Dacroment,Nickel plated,Zinc-Nickel plated,Telfon
M2-M24:Cold Froging,M24-M100 Hot Forging,
Machining and CNC for Customized fastener
Stock ProductsStainless steel: DIN6923 DIN912 DIN603 DIN315


Stainless steel screw is widely used in machinery, petrochemical, telecommunications, chemical industry, construction industry, electric power, textile, sports equipment, paper making, sewage treatment, ship, automobile and other industries, with domestic economic living standards greatly improved the application range of the stainless steel screw will be more extensive.


Stainless steel screws do not necessarily corrode rust, only that stainless steel screws are more likely to rust than iron screws.But stainless steel screws will rust in certain situations.So stainless steel screw in what condition easy to cause rusting!What are the causes of rust?

Stainless steel screw has good characteristics, strong corrosion resistance, high temperature resistance, and strong rust resistance.But it will rust in harsh conditions.For example, stainless steel screws in very wet conditions, daily sun exposure, wind and rain.It will be a little rusty for a long time.Contact with some acid-base chemicals to produce chemical reactions.Cause corrosion to rust.There is already a bad stainless steel screws, such as material for stainless steel SUS201 screws to use the product in the water of the sea, because often time of soaking, originally SUS201 stainless steel screw itself is not very suitable for the water of the sea salt resistant used above.Cause corrosion to rust.The use of seawater products is generally recommended to use stainless steel SUS316 screws, because 316 stainless steel screws can carry corrosion and other performance is better.

It can be concluded from the above that stainless steel screws will corrode and rust in certain situations.Therefore, this requires reasonable use of stainless steel screws.Use stainless steel screws with different materials under different conditions.Moreover, in different occasions, when using stainless steel screws, special attention should be paid to the details.As far as possible stainless steel screw corrosion rust control.

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