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DIN933 /DIN931 Hex Bolt Stainless Steel 304/316 Full Thread/Half Thread
Short Description: DIN933/931 HEX BOLT SS304/316
Place of Origin:China
Surface treatment:plain
Measure System:Metric, Inch
Certification:ISO9001:2015
Grade:A2-70/A4-70
Application:Machinery, Construction, General Industry, Heavy Industry
Size:M6-M48
Packing:Bag, Carton, boxes+Carton,Pallet
Delivery time:2-10 days
Standard:DIN933
Thread type:Full thread
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Description
Item DIN933/931 HEX BOLT SS304/316 Standard DIN,ANSI,BS,ISO,JIS Grade A2-70/A4-70 Size M3-M40 Material SS304/SS316 Surface treatment plain Packaging Details bulk packing in cartons, then put on pallets, or as per your requests. Customer design our experienced engineer team can developed the products and manufacture in accordance with samples, drawings or only ideas Terms EXW,FOB, CIF,CFR, T/T,L/C, or others. Delivery method by sea, by air or by express service Certifications ISO9001 Product Details
High strength fasteners will produce crispness when galvanized. Need special attention.
Hydrogen embrittlement is usually characterized by delayed fracture under stress. There have been automobile springs, washers, screws, sheet springs and other galvanized parts, in a few hours after assembly has been broken, the fracture proportion of 40% ~ 50%. In the process of using cadmium-plated parts of a special product, there was batch crack fracture, and a national key problem was solved and a strict dehydrogenation process was formulated. In addition, there are some hydrogen embrittlement does not show delayed fracture phenomenon, such as: electroplating hanger (steel wire, copper wire) due to many times of electroplating and pickling plating, hydrogen penetration is more serious, often appear in use a fold will occur brittle fracture phenomenon; The mandrel of a shotgun, after several times of chroming, fell to the ground and broke; Some quenched parts (large internal stress) will crack when pickling. These parts are severely hydrogenated and crack without external stress, which can no longer be used to restore the original toughness by dehydrogenation.
The higher the material strength, the greater the hydrogen embrittlement sensitivity. This is a basic concept that must be clarified by surface treatment technicians when compiling electroplating process specifications. Steels with tensile strength σb>105kg/mm2 required by international standards should be subjected to pre-plating stress and post-plating dehydrogenation treatment accordingly. The French aviation industry requires corresponding dehydrogenation treatment for steel parts with yield strength σs>90kg/mm2.
Due to the good correspondence between steel strength and hardness, it is more intuitive and convenient to judge the hydrogen embrittlement sensitivity of material by hardness than by strength. Because a perfect product drawing and machining process should be marked with steel hardness. In the electroplating, we found that the hardness of steel around HRC38 began to show the risk of hydrogen embrittlement fracture. For parts higher than HRC43, dehydrogenation should be considered after plating. When the hardness is about HRC60, dehydrogenation treatment must be carried out immediately after surface treatment, otherwise the steel parts will crack within a few hours.
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About Us
FAQ
1.You are a manufacturing company or trading company?
We are a fastener manufacturer, and our main products are Bolt, Nut, Screw, Anchor and Washer. Meanwhile, we are also a fastener trader with many years experiences in domestic and international market.
2.What quote do you offer?
We offer EXW, FCA(Guangzhou, Foshan, Yiwu, Shanghai, Wenzhou, Urumchi, and many other cities), FOB, CIF, CFR, DAP, DDP sea shipment terms.
3. Can you provide the necessary customs clearance documents
Yes. We are a legal and compliant enterprise of the People's Republic of China, having the formal import and export qualification. FORM E, CO, Invoice with embassy certification are all available for our order.
4.How pay?
T/T, Alibaba Online Payment, Paypal are all available.
5.How transport?
The most common means is sea shipment, if the order quantity is great, this means is the best.
But if the order quantity is little, we advise the air express or air transportation.
Of course, the land transportation is also OK.
Door to Door is also available.
6.Can I order a small list ?
Of course you can. We offer the samples service.
7.Can we print our own logo ?
Yes. We offer the customized service based on a big quantity. OEM and ODM are OK.
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The company's main products cover bolts, nuts, anchor, screws, washers and customized parts, casting parts, built-in fitting parts and steel