Custom Precision Ceramic Components: What to Include in Your RFQ

A useful quotation for custom precision ceramic components starts with a clear request for quotation, or RFQ.

An overall size and a request for “high precision” are not enough to define the complete supply scope. The supplier also needs to understand the material, functional surfaces, tolerances, mounting interfaces, inspection requirements, and expected quantity.

The goal is not to prepare a longer inquiry. It is to provide the information needed to evaluate the same requirements that your engineering team intends to approve.

ZHHIMG® offers precision ceramic solutions and lists alumina ceramic air-bearing products with dimensions tailored to customer requirements.

This guide explains what to include in a ceramic component RFQ, which details to clarify before ordering, and how to distinguish a preliminary inquiry from a production-ready specification.

Quick Checklist: What Should a Ceramic Component RFQ Include?

Use the following checklist as a starting point. Mark items as confirmed, preliminary, or subject to supplier review.

1. Explain the Application and Component Function

Start with a short description of the application.

A supplier reviewing a drawing should understand which features are functional and why they matter. This is especially useful when the design is still being developed.

Your description should answer:

• What does the component do?
• Which surfaces contact or locate other parts?
• Which areas are used as references?
• Does the component move or remain stationary?
• Is it supplied as a standalone part or within an assembly?
• Which requirements are essential to performance?

You do not need to disclose the complete machine design. A simplified interface drawing or a brief explanation of the component’s function may be sufficient.

For example:

This ceramic component is installed within a precision assembly. Surfaces A and B establish the reference orientation. The mounting-hole pattern must match the attached bracket. The drawing identifies the controlled surfaces and inspection requirements.

The description should support the drawing, not replace it.

2. Define the Ceramic Material—or Clearly Request Material Review

“Ceramic” is a material category, not a complete purchasing specification.

If your engineering team has selected a material, provide the required designation and any relevant grade or composition requirements.

If the material remains open, state that clearly. Explain the application and ask the supplier to confirm which available material could be considered.

Material Information to Include

• Material designation.
• Grade or composition requirement, where applicable.
• Required property data.
• Required material documentation.
• Restrictions on substitutions.
• Customer approval requirements for an alternative.

Do not assume that two quotations are based on equivalent materials merely because both describe the part as a precision ceramic component.

ZHHIMG’s ceramic air-bearing category specifically identifies alumina, Al₂O₃. If your project requires a particular alumina grade or composition, include that requirement in the inquiry for confirmation rather than assuming it from the category name.

If the Material Has Not Been Finalized

A useful RFQ statement is:

Material selection is open for review. Please identify the proposed material, provide relevant available data, and state any assumptions in the quotation. Final material approval is required before production.

This keeps the supplier’s proposal separate from your approved production specification.

3. Provide a Consistent 2D Drawing and 3D Model

A complete drawing package helps the supplier understand both the geometry and the acceptance requirements.

Where available, provide:

• A dimensioned 2D drawing.
• A matching 3D model.
• Drawing number and revision.
• Units.
• Material notes.
• General tolerances.
• Specific requirements for critical features.
• Referenced specifications.

Use the file formats agreed with the supplier.

Confirm Which Document Controls

State how the 2D drawing, 3D model, and any separate specifications should be interpreted together.

Before submission, check for:

• Different revision numbers.
• Dimensions that do not match.
• Missing tolerance notes.
• Features shown in only one file.
• Conflicting material descriptions.
• Unclear units.

If the model is preliminary, label it accordingly. Do not leave the supplier to decide whether a model feature or a drawing note represents the final requirement.

4. Separate Overall Dimensions from Critical Tolerances

Overall dimensions describe the component’s envelope. They do not fully describe how it must fit or function.

Identify the features that require specific control, such as:

• A reference surface.
• A locating diameter.
• A mounting interface.
• A defined thickness.
• The relationship between two faces.
• A hole pattern relative to a datum.
• A working length or functional area.

Depending on the design, the drawing may specify dimensional tolerances and geometric requirements such as flatness, straightness, parallelism, or perpendicularity.

Do not replace these requirements with broad phrases such as “ultra-high precision” or “best possible accuracy.”

Apply Requirements According to Function

A useful RFQ distinguishes between:

This allows the supplier to evaluate the actual requirements rather than assuming that every surface needs the same treatment.

Any proposed tolerance change should remain subject to your engineering approval.

5. Define Surface, Edge, and Appearance Requirements

“Smooth finish” and “no chips” can mean different things to different reviewers.

Where surface condition matters, provide measurable or otherwise clearly defined acceptance criteria.

Review:

• Which areas require a specified surface finish.
• Whether requirements apply across the entire face or only a functional zone.
• Edge-break or chamfer requirements.
• Requirements at hole entrances and intersections.
• Permitted or prohibited visual conditions.
• Cleaning and handling requirements.
• Any required visual inspection method.

If a feature is particularly sensitive, identify it directly on the drawing.

For example:

Apply the specified surface requirement to the marked functional area. Edge requirements and visual acceptance criteria shall follow the approved drawing.

Avoid using an example image as the only definition of a critical requirement unless the buyer and supplier have explicitly agreed how that image will be used for acceptance.

6. Include Mating Interfaces and Assembly Information

A ceramic component may satisfy its individual drawing requirements while still leaving unresolved questions at the assembly level.

Provide the information needed to review the interfaces, including:

• Mating component drawings or relevant dimensions.
• Contact and locating surfaces.
• Mounting features.
• Required clearances.
• Assembly orientation.
• Fasteners or attachment arrangements, where applicable.
• Which party supplies each additional component.
• Which checks are required after assembly.

If your order is for a ceramic component only, state that.

If you want an assembled product, describe the required scope and ask the supplier to confirm availability. Do not assume that a component quotation includes assembly, alignment, or complete-system performance verification.

For ceramic air-bearing inquiries, also make clear whether you are requesting the ceramic part alone or a broader functional assembly.

7. Describe Relevant Operating Conditions

If operating conditions influence the material or design requirements, include them in the RFQ.

Depending on the application, relevant information may include:

• Operating and storage temperature ranges.
• Contact with liquids or chemicals.
• Mechanical loading.
• Repeated motion or loading cycles.
• Cleanliness requirements.
• Vacuum requirements, if applicable.
• Exposure to particles or other contamination.
• Cleaning procedures.

Not every item applies to every part. Include the conditions that matter to your application, and distinguish required conditions from background information.

If compliance with a specific application requirement is needed, identify the evidence you expect. A supplier’s general material description should not be treated as proof that every application-specific requirement has been met.

8. Agree on Inspection and Documentation Before Ordering

The inspection scope should be part of the inquiry, not an additional expectation introduced after the part is manufactured.

State:

• Which dimensions and surfaces must be checked.
• Which drawing revision applies.
• Which acceptance limits apply.
• Whether you require a specific report template.
• What material documentation is needed.
• What calibration information is required.
• Whether special testing is requested.
• Whether assembly-level checks are included.

The supplier should confirm which documents and checks are included in the quotation.

Define the Required Deliverables

A project may request some or all of the following, subject to agreement:

Request only the documentation needed for your approval process, but make those requirements explicit.

For formal conformity statements, clarify any requirements for measurement uncertainty and the acceptance decision procedure with the supplier.

9. State Prototype Quantity and Expected Production Demand

Quantity is an important part of the quotation scope.

Provide:

• Prototype quantity.
• Quantity for the first production order.
• Expected repeat-order quantity.
• Forecast frequency, if available.
• Whether deliveries will be split.
• Whether a first article must be approved before the remaining order proceeds.

If the forecast is uncertain, say so.

A useful inquiry might read:

Please quote the prototype quantity separately from the planned production quantity. The production forecast is preliminary and is not a purchase commitment.

This gives the supplier a clearer basis for quotation without presenting an estimate as a confirmed order.

10. Define the Delivery Request and Packaging Expectations

State your requested delivery date, but distinguish it from a supplier-confirmed schedule.

Include:

• Required destination.
• Preferred delivery terms.
• Requested shipment date or arrival date.
• Packaging requirements.
• Identification and labeling requirements.
• Any special handling or cleanliness instructions.
• Whether inspection documents are required before shipment.

If timing depends on design approval, first-article acceptance, or customer-supplied parts, identify those dependencies.

ZHHIMG’s ceramic air-bearing product page asks customers to provide their size requirements and desired delivery time, making both useful items to include at the first inquiry stage.

Preliminary Inquiry vs. Production-Ready RFQ

You can contact a supplier before every detail is finalized. The important point is to identify the maturity of the specification.

A preliminary inquiry should state its assumptions and open questions.

A production-ready RFQ should minimize unresolved requirements that could change manufacturing, inspection, or delivery.

Example: An Incomplete Inquiry and an Improved RFQ

The following examples are illustrative, not actual customer inquiries.

Incomplete Inquiry

We need a high-precision ceramic part, approximately 300 mm long. Please send your best price.

This does not define the material, complete geometry, critical tolerances, quantity, inspection, or delivery scope.

Improved RFQ

Please review the attached drawing and CAD model for a custom ceramic component.

Application: reference component within a precision assembly.
Drawing revision: Rev. B.
Material: proposed alumina grade subject to our approval.
Critical features: identified on the drawing.
Quantity: two prototypes; repeat-order demand to be confirmed.
Inspection: please confirm the checks and documentation included in your quotation.
Delivery: please quote to the stated destination and identify the delivery terms.
Requested schedule: please advise feasibility after drawing review.

Please list any assumptions, exceptions, or proposed changes separately. Production changes require written approval.

The improved inquiry gives the supplier a defined starting point and makes the remaining decisions visible.

Copy-and-Use RFQ Template

Subject: RFQ – Custom Precision Ceramic Component – [Part Number / Project]

Dear ZHHIMG Team,

Please review the attached information and provide a quotation for our custom precision ceramic component.

Please identify:

• The proposed material.
• The scope included in the quotation.
• Any assumptions or exceptions.
• Any requirements needing further review.
• Available inspection documentation.
• The proposed delivery schedule and terms.

Please submit proposed drawing or specification changes for approval before production.

Best regards,
[Name]
[Company]
[Contact details]

Frequently Asked Questions

Can I request a quote before selecting the ceramic material?

Yes. Identify material selection as an open item and provide the application requirements. Ask the supplier to state the proposed material and available supporting information. Final approval should be documented before production.

Is a 3D model enough for a precision ceramic quotation?

A model can communicate geometry, but the RFQ must also define tolerances, material, surface requirements, inspection, and other purchasing requirements. Provide a controlled drawing or an agreed specification package that supplies those details.

Should every surface have the same tolerance?

Specify requirements according to function. Identify critical reference and mating surfaces separately from clearance or nonfunctional areas. Any changes to the required tolerances should be approved by your engineering team.

Does ZHHIMG offer alumina ceramic air-bearing products?

Yes. ZHHIMG’s ceramic air-bearing category identifies alumina, Al₂O₃, and states that dimensions can be supplied to customer requirements. Submit the required dimensions, specifications, quantity, and requested schedule for review.

Can I request a specific ceramic grade?

Include the complete grade requirement in your inquiry and ask for confirmation. Do not assume that a general product category confirms the availability of every composition or grade.

What should I compare when reviewing supplier quotations?

Compare the proposed material, drawing revision, tolerances, included inspection, quantity, supply scope, packaging, delivery terms, and stated exceptions—not just the unit price.

Request a Custom Precision Ceramic Component Review

A clear RFQ connects the component’s function with the material, drawing, acceptance criteria, and delivery requirements.

ZHHIMG® provides precision ceramic solutions, including alumina ceramic air-bearing products offered in customer-specified sizes.

To discuss your project, send:

• Your 2D drawing and available 3D model.
• Material requirements or the application information needed for review.
• Critical dimensions, tolerances, and surface requirements.
• Prototype and production quantities.
• Inspection and documentation requirements.
• Delivery destination and requested schedule.

Email: info@zhhimg.com.

If the design is still preliminary, identify the open requirements so they can be reviewed before the production specification is finalized.