Manhole Cover Ring
SKU: FL-PF-012
Ductile iron + steel manhole cover ring. Custom sizes.
| Material | Q235 steel frame + ductile iron cover |
|---|---|
| Manufacturing Process | Laser cutting + casting + assembly |
| Surface Finish | Bitumen coating |
| Tolerance | ±1mm |
| Round diameter | 600mm standard |
| Square | Custom |
| Load class | A15-F900 |
| Material | EN-GJS-500-7 |
| MOQ | 100 units |
| Lead Time | Quoted after drawing review and process confirmation |
| Sample Time | Quoted after drawing review and process confirmation |
| Sample Fee | USD 150 |
| Price Range | USD 80-220/unit |
| Applications | Roads, sidewalks, infrastructure |
| Compliance | EN 124 |
| Export Markets | USA, Germany, Africa |
Manhole cover rings and frames provide secure, load-bearing access to underground utility infrastructure including sewers, water mains, telecommunications, and electrical systems. These components must support vehicle loads, prevent water infiltration, and maintain secure access for utility personnel.
Manhole Component Types
Standard manhole frames support round covers for utility access. Rectangular frames support utility vault covers for larger access points. Recessed frames allow paving material to be installed flush with cover surfaces for aesthetic areas. Locking frames provide secure access in high-security or flood-prone areas. Ventilated frames allow air circulation through underground systems.
Sheet and Grade Selection for Manhole Cover Ring Metal Fabrication
Ductile iron is the traditional material for manhole frames and covers, providing excellent load capacity and durability. However, steel fabrication provides alternatives for specialized applications. Galvanized steel frames provide corrosion resistance for non-traffic applications. Stainless steel (grade 304 or 316L) provides superior corrosion resistance for corrosive environments. Steel frames may be used in combination with cast iron or composite covers.
Design Points for Manhole Cover Ring Metal Fabrication
Frames must support traffic loads appropriate to their installation location: light-duty for pedestrian areas, heavy-duty for vehicular traffic, and extra heavy-duty for highway applications. Frame-to-cover fit must prevent rattling and displacement while allowing easy removal. Sealing systems must prevent water infiltration and gas escape. Frame installation must provide proper elevation relative to surrounding surface. Locking mechanisms must provide security while allowing utility access. Frames must resist corrosion from underground environments.
From Flat Blank to Finished Manhole Cover Ring Metal Fabrication
Our TRUMPF fiber laser cuts frame components, bracket plates, and locking mechanisms from flat sheet stock. CNC press brake machines form frame profiles and mounting flanges. Component assembly uses MIG welding for galvanized steel and TIG welding for stainless steel. Surface treatments include hot-dip galvanizing, powder coating, and bituminous coating for underground corrosion protection.
Field Notes: Manhole Covers, Frames and Rings
Manhole and access covers are a wear-and-safety product rather than a structural one, and the two requirements that shape them are traffic loading and the level of the finished surface. A cover sits in a road or a pavement, so its frame has to transfer the wheel load into the surround without rocking; a frame that is not seated properly will rock under traffic and break up the surround within a season. That makes the seating detail – not the plate thickness – the critical part of the design, and it is why frames are made to sit on a prepared bed rather than simply be bolted down. Where a cover is a fabricated assembly rather than a casting, the other consideration is that it has to be liftable by one or two people, which sets an upper limit on mass that is often tighter than any strength requirement.
Payment Terms
How a project is paid for is agreed before production starts, and the structure that applies to your order is stated on the quotation and on the order confirmation, so there is no ambiguity later.
- 30% advance payment with the order and the 70% balance before shipment — our standard structure.
- 70% advance payment with the order and the 30% balance before shipment — used for some projects.
- 100% payment in advance before production starts — used for some projects.
If your finance team works to a fixed structure, say so in the first enquiry and we will confirm what applies to your order before you commit. Request a quotation.
Questions buyers ask before sending drawings
The questions that come up most often before a project starts, answered the way we answer them by email.
What do you need from me to quote Manhole Cover Ring?
2D drawings as PDF, DWG or DXF, or 3D files as STEP, IGES or SolidWorks, together with material grade, sheet thickness, surface finish, quantity and destination country. If the drawing is not finished yet, send a photo, a sketch or the existing part instead — we review what can be measured from it and reply with the questions that still need answering.
How long does a quotation take?
Enquiries are answered within one business day. Simple laser-cut and bent parts are quoted within 24 hours. Welded frames, assembled units and multi-part structures are quoted after the drawing review and process confirmation, and the date is confirmed in our reply.
Is there a minimum order quantity?
Prototypes are made from a single piece and small batches of 10–50 pieces are routine. Prototype, first batch and repeat volume are quoted together so the numbers stay consistent as the project scales.
Can you work from a sample or a photo if I have no drawing?
Yes. Send the part itself, clear photographs with a rule or caliper in frame, or a dimensioned sketch. We measure what can be measured, list what is still undefined, and confirm it with you before production.
Need a Similar Part?
Most enquiries that start on a page like this are not an order for Manhole Cover Ring — they are a search for a factory that can make something like it. Send us your drawing, 3D model or sample and we will review the manufacturing process and the quotation requirements, then come back with a process plan, a price and a lead time.
We work from 2D drawings, STEP / DWG / DXF / PDF files, or a physical sample if that is all you have.
No complete drawings yet? Describe the part, send photos or a sketch, or send a sample — we can start from there. Discuss your project.
Trade Terms and Delivery
We quote under the standard Incoterms your logistics team already works with, and build the packing and documentation around the one you choose.
- EXW — you collect from our Ningbo facility and run export clearance through your own forwarder.
- FOB Ningbo — we deliver to the vessel at Ningbo port and handle export clearance.
- CIF — we cover carriage and insurance to your named destination port.
- DDP — we handle carriage, insurance, import clearance and duties through to your door.
Send your destination country, target delivery date and preferred trade term together with the drawing. Request a quotation.
Quotation Time
We quote from your drawings. How long that takes depends on what the part asks for:
- Simple parts — quoted within 24 hours. Laser-cut blanks and bent components, supplied with complete 2D or 3D drawings. Mon–Fri, GMT+8.
- Complex assemblies — quoted after the drawing review. Payment kiosks, multi-part welded frames, enclosures with purchased hardware, or anything needing a coating or assembly trial. We confirm a quotation date once the scope is clear.
Production lead time is quoted separately, after drawing review and process confirmation. Send your drawings.
What stands behind this quotation
- Manufacturing since 20162,500 m² Ningbo plant — 3 laser cutting machines (including newer TRUMPF), 4 CNC press brakes and 10 welding stations.
- Shipped to more than 30 export marketsEnclosures, cabinets and formed parts supplied to OEM buyers across Europe, North America and Asia.
- 123 documented product casesMedical device housings, HVAC and heat pump enclosures, agricultural and livestock equipment, industrial hydraulics, material handling trolleys and EV charging cabinets.
- Factory evidence you can checkTUV Rheinland audit reference MIC-ASI243729 and Bureau Veritas reference MIC-ASR263630 available for buyer review under NDA.
Before you send drawings: an NDA is signed on request · first-article inspection is carried out before a batch continues · pricing is staged from prototype quantity to repeat volume · pre-shipment photos and packing records are prepared when the project needs them.