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  1. Email :
  2. Tel : +86-15116381985
  3. Add : Headquater Address : No.12, Dongshi Road, Changsha Economic Development Zone, Changsha, Hunan Province, China
  4. Foundry Address : Foundry Address: NO.260,Jinchang Road,Jinjing Town,Changsha,Hunan Province,China

Square Manhole Cover&Frame

Catalog NumberA-Cover SizeB-Clear OpeningC-Frame SizeD-Frame HeightE-Duty ClassF-Lockable
square heavy duty ductile iron manhole cover550*550490*490650*650120D400yes
All dimensions in mm.

Main business: hydraulic access cover, power manhole cover cover, electric manhole cover cover, intelligent monitoring manhole cover cover, intelligent communication manhole cover cover, intelligent water manhole cover cover, intelligent password lock manhole cover cover, integrated pipe gallery manhole cover cover, etc. It is a strategic partner of famous enterprises such as Huawei, China-telecom, Unicom, Zhongshan Dahua, CSCEC, CCCC, China Railway, Xi'an electric power, and the only supplier of Hong Kong Zhuhai Macao Bridge.Our products are exported to 32 countries and regions, Italy, Spain, UK, Malaysia, Middle east, Singapore, South Korea, Japan, Australia,Africa, etc,175 cities around the world.

Founded 1993, Cast-King Foundry was a industry leader in exporting square heavy duty ductile iron manhole cover with lock to every continent of this earth, Just purchase directly at good price from manufacturing factory as reliable supplier, save the money usually earned by a trading company.

OEM & OED is available, look forward to having you as your agent in your local market.

We would push you to great success in municipal construction and infrascture project.

Look forward to being partner with those who are engaged in whole sale business for building material, any customized high quality mechanical and industrial casting are prvovided by us as manhole cover.

More Details


Ductile manhole cover


Ductile iron GGG50/7, gray iron






Round, square, rectangle


200mm-1200mm or as per customers’   drawing


Bituminous black


DISA Line, Hand Modelling


Drawing-mould making-raw   casting-sand blasting-rough machining-surface treatment-product inspection

Advanced technology and equipments

Tensile strength: 500Mpa Yield stress: 320Mpa
  Elongation rate: 7%
  Hardness: HBS170-230

Load capacity

B125 C250 D400 E600 F900


Machining:+/-0.02mm, finish   machining:0.002mm


Footway, pedestrians, car parks,   aircraft pavements


Longevity corrosion resistance, excellent   anti-pressure


1. Quality guarantee 

•  Chemical checking 

• Mechanical testing after heat treatment 

•  Dimension inspected 

2. Quality document

•  Full Q.A document as per client request

3.Packing and Shipping

•  Standard export package(carton/wooden case/pallet)

•  Accept FOB,FAS,CNF,CIF door to door etc. or customer

designated shipping agent.


• Drawing: we can translate your original drawing, offer

best suggestion on design.

•  Quality: we have full set quality control system to

 guarantee the best quality. 


•Inspect in house, all our products must be checked 3 times before packing

•  Third party inspection available upon requirement

In the production process of ductile iron castings, after heat treatment, shot blasting or machining, some holes with a diameter of about 0.5-3mm and a shape of spherical, elliptical or pinhole like smooth inner wall are often found. These holes are generally 2-3mm distributed under the casting skin, which is called subcutaneous porosity.

The formation of subcutaneous pores is due to the high tension on the surface of magnesium containing ferrofluid, which is easy to form oxide film, which has a certain influence on the emission of the gases that are separated out and invading, and these gases will form pores when they stay in the subcutaneous. In addition, the gelatinous solidification of nodular cast iron causes the gas channel to be blocked earlier, which will also promote the formation of subcutaneous porosity defects.

casting process web use.jpg

Any Customized Model is available from us

Any question, please feel free to contact us
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Hunan Castking Foundry Technology Co.,Ltd