Polymer Covers Wholesale Resin Water Wells Plate Composite Manhole Cover
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Product Attributes
- Customization
- Available
- After-sales Service
- as Specification
- Warranty
- as Specification
- Model NO.
- SA-MC
- Material
- SMC
- Shape
- Circle
- Certification
- RoHS, ISO, CE
- Item
- Manhole Cover
- Brand Name
- Shengao, OEM
- Size
- 200-1200mm
- Mold Type
- Shell Mold, Sand Casting
- Process
- Sand Casting + Machining
- Raw Material
- Ductile Iron, Cast Iron, Qt500
- Casting Tolerance
- CT 7 ~ CT 8
- Surface Finish
- Ra 12.5
- Dimensions
- as Per Drawing
- Surface
- Polishing, Anodising, Powder Coating
- Type
- Manhole Cover
- Application
- Road
- Metal Type
- Cast Iron
- Solar Cell Type
- Poly-Crystalline Silicon
- Frame Finishing
- Powder Coated
- Transport Package
- Pallet, Iron Frame, Flywood Box.
- Specification
- SGS, ISO9001: 2008
- Trademark
- Shengao
- Origin
- Weifang City, Shandong Province
- HS Code
- 7325109000
- Production Capacity
- 500ton/Month
- Package Size
- 60.00cm * 80.00cm * 100.00cm
- Package Gross Weight
- 2.000kg
Shipping
- Shipping Cost:
- Contact the supplier about freight and estimated delivery time.
Online Trading Protection
- Payment Guarantee
-
Platform-protected payments with refund support for eligible order issues.
- Platform Logistics
- Clearer shipment tracking with platform-supported logistics.
- Inspection Service
- Optional pre-shipment inspection for quality and quantity checks.
- After-Sales & Dispute Handling
- Platform-assisted dispute resolution, including refunds or returns when applicable.
Only orders placed and paid through Made-in-China.com Secured Trading are eligible for payment protection and the corresponding platform services.
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Product Description
Characteristics of our manhole cover:
1. Material: cast gray iron, ductile iron.2. Shape: round, square, rectangle and triangle.
3. Diameter: from 200mm to 1200mm.
4. Weight: from 7kg to 154kg or according to customers\' requirment
5. Packing: in wooden pallet with plastic layer
6. Annual output: 10,000 tons
7. Coating: black bitumen or Coating as per customers\' requirement
8. Use :municipal engineering, Traffic, pavement ,electronics,telecom, cable, petroleum, chemical industry, or drainage system and industrial facilities of valve well.

1. Advantage of our Manhole Covers
1) Can supply all kinds of load class Product such as A15/B125/C250/D400/E600/F900
2) Against theft and safety, double sealed, watertight type
3)material No. GGC50(DIN1693-73),QT500-7(GB/T1348-1988), 80-55-06(ASTM A536), FCD500(JISG 5502 2001),500/7(BS2789:1985).
4)Free charge of design.
5) 3 day pay for ready if the request in storck.
2. Detailed information of manhole cover
1) Various manhole cover made by GX Foundry strictly conform to standard and free from sand holes, blowholes,distortion or any other defects
2)Processes:
a) Automatic machine lines
b) Moulding boards
c) Green sand with hand moulding
3.Guarantee: GX Foundry will replace any heavy duty castings that have been properly installed and broken in normal use,free of charge after receipt of the broken castings.

- As the original manufacturer, we can provide factory prices directly;
- Free sample is available for the quality testing demands of client;
- Huge production capacity to meet spot supply;
- Excellent R & D production team for your various requirements escort.
- We have been exporting our manhole cover to more than 80 countries and areas
- We can provide OEM &ODM services support customization in order to satisfy various personalized needs of clients
- We have strict quality testing measures and high specification testing equipment to effectively ensure product quality
- We have a sales team directly under the factory, so that customers can contact the factory directly for any problems during the period of pre-sales, production and after-sales.

name |
Round Cast Iron Water Drainage Manhole Covers/Septic Tank Covers |
| material | ductile iron GGG50/7, gray iron |
| standard | EN124/1433/1563 |
| class | A15,B125,C250,D400,E600,F900 |
| shape | Round |
| Size | 600*600,840*840, 850*850 or as per customers' drawing |
| paint | bituminous black |
| advantage | Non-slip and safe, easy installation, easy to clean, excellent anti-pressure and attractive appearance |
| molding | DISA Line |
| process | Drawing-mould making-raw casting-sand blasting-rough machining-surface treatment-product inspection |
| application | footway, pedestrians, car parks, aircraft pavements |
| certificate | BSI, ISO9001:2000 |
| Strict quality control | Tensile strength: 500Mpa Yield stress : 320Mpa Elongation rate : 7% Hardness: HBS170-230 |
| Main products | Manhole covers and grates, Furnace, bases, Machinery parts, cookers, Valve bodies, pipe fittings, Auto parts |
| other information | we can cast and process any type of iron casting products according to customers' drawing or samples |
Applications & Industries Served
-
Municipal Roadworks: Sewer, stormwater, and utility access points on streets and highways.
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Airports & Ports: Heavy-duty covers for runways, taxiways, and cargo areas.
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Industrial Plants: Access covers for underground lines, cable trenches, and floor drains in factories.
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Pedestrian Zones & Parks: Decorative and lightweight covers for walkways and green spaces.
-
Telecommunications & Power: Utility access chambers for cables and equipment.
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Commercial Property: Drainage systems for parking lots and building perimeters.
Size( customized available for other dimensions
| Order No. | Inner dia | grating | Outer dia | Height | Weight(kg) | Pressure(KN) |
| F0536-1 | 252 x 252 | 326 x 326 | 360 x 360 | 36 | 13.5 | C250 |
| F0536-2 | 350 x 350 | 400 x 400 | 470 x 470 | 40 | 20 | C250 |
| F0536-3 | 450 x 450 | 500 x 500 | 580 x 580 | 50 | 32 | C250 |
| F0536-4 | 550 x 550 | 600 x 600 | 680 x 680 | 50 | 39 | C250 |
| F0536-5 | 350 x 350 | 400 x 400 | 500 x 500 | 100 | 36.2 | D400 |
| F0536-6 | 450 x 450 | 500 x 500 | 600 x 600 | 100 | 49 | D400 |
| F0536-7 | 560 x 560 | 600 x 600 | 700 x 700 | 100 | 62 | D400 |


Core Product Lines & Engineering Excellence
1. Heavy-Duty Manhole Covers & Frames
-
Superior Load Ratings: Engineered to meet EN 124, BS EN 124, or ASTM A48/A536 standards, with load classes ranging from Class A15 (Pedestrian) to Class F900 (Heavy Airfield Traffic). Common ratings: Class B125 (Light Road), Class C250 (Road), Class D400 (Heavy Traffic), Class E600 (Extra Heavy).
-
Precision Fit & Safety: Machined mating surfaces between cover and frame ensure a flush, secure fit that prevents rocking, reduces noise, and eliminates the risk of dislodgement under traffic.
-
Anti-Slip & Anti-Noise Design: Surface patterns include smooth, checkered, cross-bar, or custom logos. Optimized designs minimize tire noise ("rumble") and provide slip resistance for pedestrians.
2. Drainage Grates & Trench Covers
-
High-Flow Hydraulic Efficiency: Slotted or perforated designs maximize water intake while preventing debris clogging. Custom slot sizes and patterns available.
-
Robust Construction: Heavy-duty gratings with reinforced ribs and proper bearing bar support to prevent bending or breaking under point loads.
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Locking & Security Options: Integral locking mechanisms (bolt-down, internal lock) or hinge kits to prevent unauthorized access and theft.
3. Material Science & Metallurgy
-
Grey Cast Iron (ASTM A48 Class 35): Offers excellent wear resistance, castability, and vibration damping. Ideal for standard duty applications.
-
Ductile Iron (ASTM A536, 60-40-18): Superior tensile strength, impact resistance, and toughness. The material of choice for high-traffic areas and heavy-load applications due to its elongation properties.
-
Alloyed Irons: Available for specialized environments requiring enhanced corrosion or abrasion resistance.
4. Specialized & Custom Designs
-
Gas, Water & Telecom Covers: Lightweight designs for utility access chambers.
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Hinged & Locking Covers: For frequent access needs in pedestrian zones or plant floors.
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Decorative & Architectural Castings: Custom patterns, logos, or historic designs for parks, pedestrian malls, and heritage sites.
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Resin-Based Composite Covers (Optional): Lightweight, corrosion-proof, and non-conductive alternatives where metal is not suitable.



Why Source From Us?
-
Compliance Assurance: Products are manufactured to recognized international standards, simplifying project specification and approval.
-
Engineering Support: Our team can assist with load class selection, design optimization for local conditions, and custom pattern development.
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Competitive Global Pricing: Leveraging efficient production and direct export to offer excellent value.
-
Proven Export Experience: Expertise in packing and shipping heavy castings (bulk or in containers) to global destinations with all required documentation.
-
Sustainability: Cast iron is 100% recyclable, contributing to circular economy goals.


If there's anything we can help, please feel free to contact with me.
About the Supplier
This supplier has been audited by TÜV Rheinland. Verify the report on the official TÜV Rheinland website with ID "MIC-ASR2551414". Items marked "" are certified.
Company Profile
WeiFang Shengao Machinery Co., Ltd is located in WeiFang the famous city in China and the world center of kites. It is 140 kilometers far away from Qingdao port, the transportation is very convenient. Our company use the location advantages of ShanDong province to integrate resources so that we can processing according to the drawings of customers.
We mainly undertake the forging parts, stamping parts, casting parts, machining parts and other machinery spare parts. The main products we could do are gears and gear boxes, manhole covers, bucket teeth, flywheels, stove fireplace, cookwares, pump and valve spares, engine spares...Our products have been exported to the United States, Denmark, Italy, Russia, Australia etc for more than 15 years.
The material we can adopt is included various kinds of cast steel and cast iron, heat-resistant steel, carbon steel, alloy steel, alloys and other customized materials. We have strong processing capacity, we own MAZAK, HSS, YOUJI and other brands machining centers from the abroad, we also have lathes, NC lathes, NC milling, boring, grinding, drilling, broaching and wire electrode cutting machines, which are used to ensure we can fulfill different machining requirements from our customers.
We can produce according to the drawings of customers. Our Import and Export Department have many years experiences of foreign trading and our products are mainly exported to the United States, Denmark, Italy, Russia, Australia, Iran, Pakistan, South Africa etc.
Over the years, company adhere to the guideline for management of "Quality first, Reputation first, Delivery just-in-time, Price best". We will try our best to improve the technical level and perfect the enterprise management. Our company will depend on superior quality of products and sincere service to cooperate with domestic and overseas, new and old customers and establish eternal friendship to create a bright future. Sincerely welcome your drawings and samples or any other kinds of designs, our team will try the best to serve you and satisfy all the requirements you have.
Why choose us to produce your parts?
1) Experienced staffs will reply you in 24 hours.
2) Welcome OEM, ODM and Smaller quantity.
3) Exclusive and unique solution can be provided to you.
4) Special discount and protection of sales area.
5) Random quality inspection during production.
6) Delivery on time.
7) At a competitive price from our own factory.
About Our Factory & Business Background
-
Business Type
- Trading Company
- Address
- Room1002-1005, No. 10 Building, Yuhe Road, Shengli Street, Kuiwen District, Weifang, Shandong, China
-
Plant Area
- 41 square meters
-
Number of Employees
- 9
-
Registered Capital
- 1,000,000 RMB
-
Terms of Payment
- LC, T/T, D/P, PayPal, Western Union, Small-amount payment
-
International Commercial Terms(Incoterms)
- FOB, CIF, CFR, EXW
- Average Lead Time
- Peak Season Lead Time, one month, Off Season Lead Time, within 15 workdays
-
Nearest Port
- Qingdao Port
-
Minimum Order Quantity
- 10
-
Supply Chain Partners
- 10
Our Production Capability & Technical Expertise
-
Main Products
- Mechanical Parts
-
Customization Options
- Customization from Samples,Customization from Designs,Full Customization,Minor Customization,Flexible customization
-
R&D Engineers
- 2 people
Our Industry Experience & Global Business Record
-
Year of Establishment
- 2022-08-15
- Export Year
- 2010-04-06
-
Main Markets
- North America, Europe, Southeast Asia/ Mideast
-
Repeat Buyers Choice
- 50%~80%
-
Number of Foreign Trading Staff
- 5
-
Overseas Agent/Branch
- No
Our Certifications, Standards & Industry Recognition
-
Cooperated with Fortune 500
- No
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