From a component drawing to a casting enquiry
Qingdao Rinborn Machinery Co., Ltd., known as RMC Foundry, produces custom metal castings and offers CNC machining. Its pump-related range includes bodies, covers, bearing housings and open, semi-open and closed impellers. This is a starting point for OEM teams sourcing individual pump components, rather than a catalog of complete pumping units. The company presents these parts on its valve and pump components page.
Start with the part you want delivered. A housing ready for your own machine shop and a finished component ready for assembly involve different work. Naming that endpoint helps RMC respond with a relevant manufacturing proposal.
Product directions to explore with RMC
Pump bodies, covers and bearing housings
These are useful starting points when your project centers on the stationary components of a pump assembly. Introduce the part’s function, mating components and required delivery condition. For a housing, a marked drawing showing the faces and bores to be machined makes the scope easier to discuss than a photograph alone.
Custom impellers
RMC’s stainless-steel closed-impeller example combines investment casting with CNC machining and lists dynamic balancing among the available tests. That provides a concrete product reference for discussing your own impeller design. It is not evidence that every design has the same dimensions, material or test package.
Identify whether you need an open, semi-open or closed configuration, and send the relevant geometry. Ask for the machining and inspection scope to be included in the proposal, rather than assuming that a photograph defines the finished deliverable.
Machined casting components
The company’s published service range includes several casting processes alongside precision machining. A practical benefit to explore is coordinating the casting and finished features within one project discussion. Ask which route RMC proposes for your drawing and which operations are included in the quotation.
Connect your project with CNFX product references
The following pages explain related component categories. Their general specifications are not quotations or RMC-specific performance commitments.
| Product reference | Relevant discussion with RMC |
|---|---|
| CNC Machined Part | Which surfaces and interfaces should arrive finished, and which remain for your own assembly process? |
| Ductile Iron Casting | If your drawing specifies ductile iron, identify the grade, component geometry and delivery condition for the foundry’s review. |
A short brief that moves the conversation forward
For an illustrative pump-cover project, your opening message could be: “We need a custom cast cover for an existing pump assembly. We have a drawing and want a quotation including the marked machining operations.” This is a sample enquiry, not a reported RMC customer order.
- Identify the component and its role in the assembly.
- Provide the drawing revision, specified material and quantity.
- Mark the requested machining and finishing operations.
- State the required inspection documents and intended delivery destination.
- Review the proposed scope against your drawing before agreeing to sample production.
Avoid mixing multiple drawing revisions or asking for “a finished part” without defining the finish. If a requirement is still undecided, name it as a question for the factory instead of supplying a guessed specification.
Buyer questions
Does this article offer a complete pump?
No. It introduces RMC’s custom cast and machined components. Explain your component need when contacting the company.
Can I order the impeller shown on the company’s website?
Use it as a manufacturing reference. Request confirmation of your own geometry, material, quantity and available tooling before treating it as an orderable item.
How do I start if my drawing is not complete?
Describe the application and say which files or samples you have. Ask what additional information the company needs to assess the project. Price and delivery depend on the agreed scope.
Start a pump-casting conversation
Enquire with Qingdao Rinborn Machinery Co., Ltd. →
Introduce the component through the factory’s CNFX profile. Arrange an appropriate sharing channel before sending confidential drawings.
About this spotlight
Prepared by CNFX using RMC’s published company and product information, checked on 15 September 2026. See the company profile for its business identity. Project-specific capabilities and commercial terms are agreed with the factory. Suggest a correction.