SUS304 SUS304L Welded Metal Bellows Forged KF25 KF40

Place of Origin CHINA
Brand Name DM
Certification ISO 9001/3.1 CERTIFICATE
Model Number DM-069
Minimum Order Quantity 1 set
Price 3000USD-5000USD/SET
Packaging Details 1000 Sets per Month
Delivery Time 20-30DAYS

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Product Details
Material SUS304, SUS304L, SUS316, SUS316L, 316LN-ESR Dimension(L*W*H) Customized
Surface Treatment Sandblast Polished, Electro Polished, Manual Polished Technics Forged
Application Medicine Processing, Chemicals Processing, Food Processing Place Of Origin Jiangsu,China
Shape Cylindrical, Box, D-shape, Spherical, Polygon, Bell Jar, Customized Package Plywood Case
After-sales Service Online Support, Video Technical Support OEM Service Yes
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SUS304L welded metal bellows


SUS304 welded metal bellows


DM-069 KF40 flex hose

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Product Description
Product Description


KF25 KF40 Metal Welding Vacuum Flexible Hoses Stainless Steel Vacuum Bellows


These KF40 Flexible Bellows hose (0.2mm thin wall) vacuum fittings follow ISO-KF standards and have a flange size of NW40. They are unsheathed and butt welded. Commonly used to build foreline vacuum plumbing and process systems. They are often called quick flange fittings because they are quick to assemble. A circumferential clamp and centering ring form the vacuum seal between the connecting flanges.
The standard sizes for quick flange fittings are KF-10, KF-16, KF-25, KF-40, and KF-50 with flange sizes NW-10, NW-16, NW-25, NW-40, and NW-50, respectively. They are made of corrosive resistant stainless steel.


Classification: KF40 100mm-1000mm Flexible Pipe
Bellows are thin-walled metal Bellows,like a spring.
Vacuum bellows are vacuum negative pressure and can only be vented. Generally, it is recommended to buy T=0.15mm compressible flexible pipe if the pipe is less than 300mm.
Chuck Diameter:KF16=30mm KF25=40mm KF40=55mm KF50=75mm;
We also offer these kinds of models(KF16,KF25,KF40,KF50), if you have spcecial requirements, please feel free contact us.



Schematic diagram


single crystal furnace welded bellow for accelerator and vacuum industry 0

Its composition is composed of two formed hollow diaphragm with concentric circle for inner edge welding to form a diaphragm pair, and then a plurality of diaphragm pairs stacked together for outer edge welding to form a corrugated section, and then at both ends and end plate metal welding combined into a bellows group, so that it can be reciprocated with other moving parts according to the external needs





  • Temperature: -196-450℃
  • Medium: Vacuum/Gas
  • Pressure: -0.1Mpa
  • Size:From DN5-DN300






Detailed Images



SUS304 SUS304L Welded Metal Bellows Forged KF25 KF40 1


SUS304 SUS304L Welded Metal Bellows Forged KF25 KF40 2


Company Profile


DRACHMA (ZHANGJIAGANG) MATERIAL CO.LTD has two main production plants. Zhangjiagang plant is responsible for the rough forming of workpieces, mainly forging process; While Hangzhou plant is mainly responsible for precision machining, welding and inspection of products. We implement this layout mainly to use the industrial advantages of each region to achieve maximum economic benefits.


Traditional processing enterprises often do not have such ability, the lack of blank forming ability is unable to achieve the optimal use of materials, resulting in excessive processing allowance, long cycle, high cost. Zhangjiagang is located in the southern jiangsu province, which has the strongest forging capacity in China. It has a good supporting industry and can realize the diversified production of forging and pressing blanks. Thanks to this, the product cycle of our company is faster, the cost performance is higher, and the forging products have better mechanical properties than the products directly processed by rod or plate.


In addition, our company has strong welding ability, which can weld and assemble parts to achieve system delivery. We adopt the mode of automatic robot welding and manual precision welding to achieve flexibility and high quality.


 SUS304 SUS304L Welded Metal Bellows Forged KF25 KF40 3


Equipment List



Name Type Quantity Processing range Precision(um)
CNC MAZAK(QTN350L) 1 φ720*1250 3
CNC MAZAK(QTN250L) 1 φ580*1500 3
Turn milling center MAZAK(QTN250M) 2 φ580*600 3
CNC Newway(NL-634SC) 1 φ630*1000 5
CNC FUJI(TN-36) 2 φ350*290 3
CNC HAAS SL30 1 φ620*750 3
CNC MAZAK FJV200 1 560X*410Y*560Z 3
CNC LGMAZAK NEXUS160AN-2PC 1 560X*410Y*660Z 10
CNC WHEELEL 2 560X*410Y*660Z 5
Welding Miller 1    


Material List we can deal



Stainless steel :304/1.4307 316/1.4404 321/1.4541 316Ti/1.4571 317L 904L F44 NO6625 UNS718

440A/B/C 431 446 F6a F11 F22 F91


Duplex steel : F51 F60 F53 F55


Aluminum : 6061 6063 7075 5052