Manhole Cover and Drain Grate

Manhole Cover and Drain Grate Manufacturer for Municipal & Industrial Projects

We supply ductile iron manhole covers and frames, trench drain grates, and galvanized steel gratings for municipal infrastructure, road drainage, commercial developments, and industrial facilities. Product configurations can be specified by material, clear opening dimensions, load class, frame design, surface finish, and locking requirements.
For projects using EN 124 requirements or US project specifications, we help buyers identify suitable product designs and confirm applicable testing requirements before production. Custom dimensions, cover markings, and frame configurations are available subject to drawing review and manufacturing feasibility.

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Product Range

Ductile Iron Manhole Covers & Frames

Types: Solid Top, Circular, Square, Rectangular, Double-Triangular Anti-Rattle Covers.
Key Features: EPDM rubber gaskets for noise reduction, 100°/118° hinged security locks, keyhole lifts, and anti-theft bolts.
Load Rating: EN 124 Class B125 to F900.

Trench Drain Grates & Gully Gratings

Types: Hinged Gully Gratings, Longitudinal Slot Grates, Heel-Proof Serrated Grates.
Key Features: High-hydraulic intake area, anti-slip surface pattern, bolted frame anchorage for heavy traffic areas.
Load Rating: EN 124 Class C250 to E600; AASHTO H-20 / HS-20.

Galvanized Steel Trench Gratings

Types: Welded Steel Bar Grating, Pressure-Locked Gratings, Anti-Slip Serrated Trench Covers.
Key Features: High strength-to-weight ratio, hot-dip galvanized coating, custom span design for trench channels.
Material & Finish: Carbon steel (Q235/ASTM A36), Stainless Steel (304/316), Hot-Dip Galvanized to ISO 1461 / ASTM A123.

Materials and Technical Specifications

Parameter	Ductile Iron	Grey Cast Iron	Carbon Steel Grating
Example material designation	EN-GJS-500-7	EN-GJL-200	ASTM A36, where specified
Key selection factors	Strength, ductility, casting design	Grade, casting design, intended application	Bar size, span, support and deflection
Mechanical properties	Confirm against the specified grade and material documentation	Confirm against the specified grade and material documentation	Confirm against the applicable material specification and product design
Surface finish	Bituminous coating or epoxy coating, as specified	Bituminous coating or other specified finish	Hot-dip galvanizing or other specified finish
Applicable requirements	Relevant EN 124 requirements and applicable material specifications	Relevant EN 124 requirements and applicable material specifications	Applicable fabrication, coating and project requirements
Typical applications	Roads, utility access, ports and industrial areas	Applications permitted by the selected grade and product design	Drainage trenches, industrial channels and service areas

Surface Treatment Options

Bituminous coating: A commonly specified finish for cast iron products. Coating type and acceptance criteria should be confirmed for the selected product.

Epoxy coating: Available where specified, subject to coating system, preparation, thickness, and application requirements.

Hot-dip galvanizing: Available for suitable steel components. Applicable coating requirements should be established under ISO 1461, ASTM A123, or the project specification, as appropriate.

Stainless steel: Grades 304 or 316 may be considered for applications requiring corrosion resistance, subject to the operating environment and material suitability.

Coating thickness and acceptance criteria should be confirmed for each product and project rather than assumed to be identical across all materials and standards.

Pultruded Galvanized Ductile Iron Grating For Bridge Walkways

EN 124 Load Classes and Selection

EN 124 Class	Test Load	Typical Installation Area
A15	15 kN	Pedestrian areas and cycleways
B125	125 kN	Footways, pedestrian areas, and comparable locations
C250	250 kN	Kerbside channels and specified roadside areas
D400	400 kN	Carriageways and parking areas accessible to heavier vehicles
E600	600 kN	Areas subject to high wheel loads, such as certain industrial or port facilities
F900	900 kN	Areas subject to exceptionally high wheel loads, such as specified aircraft pavement areas

Pultruded Galvanized Ductile Iron Grating For Bridge Walkways suppliers

Manufacturing and Quality Control

Typical cast iron production process
Pattern and tooling review → Melting and material control → Molding and casting → Cooling and fettling → Shot blasting and machining, where required → Surface treatment and optional gasket assembly → Dimensional and specified load testing → Final inspection and export packaging.

Inspection and Testing
Material verification: Review of material grade and chemical composition documentation, where required.

Dimensional inspection: Verification of clear opening, overall dimensions, frame fit, and other drawing-defined tolerances.

Load testing: Testing to the applicable product standard and agreed sampling or inspection plan.

Coating inspection: Verification of coating type, appearance, thickness, or other acceptance criteria specified for the order.

Fit and seating inspection: Checking the contact between cover and frame for fit, rocking, and uneven seating.

Documentation: Inspection reports, material documentation, and test reports where applicable and agreed.

Customization and Supply Options

OEM Custom Molding

Production based on buyer CAD/STEP files or physical samples, including custom logo engraving, local language markings, and specific clear opening dimensions.

Frame Variations

Solid flanges, perforated flanges for concrete anchoring, deep-seating frames, and adjustable height frame systems.

Locking & Sealing Options

Single/double locking bolts, stainless steel hex bolts, EPDM rubber sealing strip inserts, and airtight/watertight gasketed designs.

Packaging & Export Logistics

Heavy-duty steel-banded wooden pallets, plastic shrink wrap, edge corner protection, and containerized loading optimized for fork-truck unloading.

Our Factory

FAQ

Q: How can I select the correct manhole cover load class?

A: Identify the installation location, traffic conditions, required clear opening, and governing standard. For EN 124 projects, select the class appropriate to the installation area. For US projects, provide the relevant project specification and test requirements so the supplier can confirm the suitable product configuration.

Q: What is the difference between ductile iron and grey cast iron manhole covers?

A: Ductile iron and grey cast iron have different graphite structures and mechanical properties. Ductile iron grades are commonly specified where greater ductility and tensile strength are required. The suitability of either material depends on the grade, casting design, product dimensions, loading conditions, and applicable test results.

Q: Can you manufacture covers with custom dimensions or logos?

A: Custom dimensions, markings, and frame configurations may be available subject to drawing review, tooling requirements, and manufacturing feasibility. Please provide a drawing or sample, the required clear opening, installation conditions, and target quantity for assessment.

Q: What test documents can be supplied?

A: Available documentation depends on the product and order requirements. Buyers should specify whether they require material certificates, dimensional inspection reports, load-test reports, coating inspection records, or third-party inspection. Document type and availability should be confirmed before the order is placed.

Q: Which surface treatment is suitable for corrosive environments?

A: The choice depends on the exposure conditions, including moisture, chlorides, chemicals, temperature, and maintenance requirements. Hot-dip galvanizing, specified coating systems, or stainless steel may be considered for suitable applications. The required finish should be confirmed against the environment and project specification.

Q: How are heavy manhole covers and steel gratings packaged for export?

A: Packaging depends on the product weight, dimensions, handling equipment, and transport route. Pallets, strapping, protective wrapping, and edge protection can be specified where appropriate. Confirm packing dimensions and shipment weight before container planning.

Request a Technical Quotation

To assess your requirements and prepare a suitable quotation, please provide as much of the following information as available:
Product type and application.
Drawing, clear opening, and overall dimensions.
Required material grade and surface finish.
EN 124 class or the applicable project specification and test requirements.
Frame configuration, locking, gasket, or anchoring requirements.
Order quantity, destination port, and packaging requirements.
Required inspection documents or third-party inspection scope.

Contact: anzhiyuan@yhmadeinprc.com.cn
Our team can review the submitted requirements and confirm product feasibility, applicable specifications, documentation, MOQ, and estimated lead time before order confirmation.

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