Incomplete custom gear RFQs create extra back-and-forth, unclear quotation scope, missed inspection requirements, and sourcing delays. For OEM sourcing teams, mechanical engineers, purchasing engineers, and quality teams, a custom gear quote should give the supplier enough information to review the part as a manufacturing project, not just identify a gear from a catalog.
A strong RFQ does not need to be perfect. It should show what is known, what is uncertain, and what must be confirmed before production.
Quick Answer: What to Include in a Custom Gear RFQ
To request a quote for custom gears, send a controlled drawing or physical sample, key gear geometry, material or heat treatment expectations, operating conditions, quantity, requested timing, and quality document requirements. If some specifications are unknown, provide application context, mating gear information, load, speed, duty cycle, and environment so the supplier can review manufacturability and quotation scope.
RFQ area | Information to provide |
|---|---|
Files and references | Controlled 2D drawing, CAD file, clear reference photos, or physical sample. |
Gear geometry | Gear type, module or DP, pressure angle, tooth count, face width, bore, OD, ID, and mounting details. |
Material and process expectations | Material, current material if known, heat treatment, hardness, surface treatment, finishing, corrosion, cleanliness, or packaging requirements. |
Application conditions | Load, torque, speed, duty cycle, backlash, noise target, lubrication, temperature, contaminants, space limits, and mating components. |
Quantity and production stage | Prototype, pilot build, one-time replacement, repeat OEM production, immediate quantity, and expected annual demand if available. |
Quality documents | Inspection reports, material certificates, FAI, PPAP, COC, traceability, and customer-specific document requirements. |
Commercial timing | Requested timing, project schedule target, and sourcing constraints that may affect review. |
Why Complete RFQ Information Matters
A custom gear RFQ is not only a request for a unit price. The supplier may need to review manufacturability, process route, material and heat treatment assumptions, inspection scope, documentation requirements, production stage, quantity, and timing.
Complete RFQ information helps the supplier understand quotation scope and reduce clarification loops. It also gives engineering, purchasing, and quality teams a clearer basis for discussion before production.
Drawings, CAD Files, Photos, and Physical Samples
A controlled 2D drawing is preferred when tolerances, revision control, material, heat treatment, and inspection requirements matter. The drawing should show the current revision, critical dimensions, tooth data, bore and keyway details, mounting features, and any inspection or documentation notes.
CAD files can support geometry review when available. Buyers may provide PDF drawings and CAD files such as DWG, DXF, STEP, or IGES, but these are examples rather than a complete file-format requirement. Final quotation scope should be confirmed during RFQ.
Photos can help explain orientation, wear condition, mounting context, or sample background. Photos alone usually are not enough for final quotation or production scope.
If a drawing is unavailable, a physical sample can help start the review. Additional measurements, material information, mating gear data, operating conditions, and documentation requirements may still be needed, especially when the sample is worn or the gear must fit existing equipment.
Gear Geometry and Specification Checklist
Gear geometry is one of the most important parts of a custom gear manufacturing quote. Provide as much of the following information as possible:
Gear type, such as:
Internal gear, pinion shaft, compound gear, plastic gear, stainless steel gear, or custom gear assembly.
Pressure angle.
Tooth count.
Helix angle for helical gears.
Face width.
OD, ID, and bore.
Keyway, spline, hub, shaft, set screw, bearing journal, mounting holes, axial structure, and mounting method.
Mating gear or assembly information where relevant.
Drawing revision, sample context, or known changes from the original design.
These details help the supplier review the gear as a manufacturing project and reduce the risk of quoting a scope that misses a mating part, mounting constraint, or inspection requirement.
Application and Operating Conditions to Share
If some specifications are unknown, application information helps the supplier ask better follow-up questions. Useful operating details include:
Load and torque.
Speed.
Duty cycle.
Backlash expectations.
Noise target.
Lubrication method.
Temperature range.
Contaminants or corrosion exposure.
Space limits.
Target cost or performance constraints.
Mating component information.
Application data can guide review, but final design suitability and fit should still be confirmed according to drawing and order requirements.
Material, Heat Treatment, and Surface Treatment Requirements
If the material is already specified, include it in the RFQ. If the material is unknown, share the current material if available, plus the load, speed, wear, corrosion, noise, heat treatment, and cost requirements that may influence selection.
Material examples that may be discussed during RFQ include C45 / 1045 / S45C, AISI 1018 / 1020, 40Cr / 5140, 42CrMo / 4140, 20CrMnTi / 8620, GCr15 / 52100, 304 / 316 stainless steel, 17-4PH, brass, bronze, gray cast iron, ductile iron, POM / acetal, nylon, MC Nylon, UHMW-PE, PEEK, and glass-fiber-reinforced nylon.
Material selection should be confirmed according to load, speed, wear resistance, corrosion exposure, noise target, heat treatment needs, dimensional stability, and cost requirements. Do not assume every material is stocked or suitable for every application.
Also state any heat treatment, hardness, surface treatment, cleanliness, corrosion, or packaging requirements if known. These can affect process route, inspection scope, quotation basis, and timing discussion.
Manufacturing Review and Customization Options
A custom gear supplier may need to review the process route before quoting. That review can include blank preparation, basic machining, tooth forming, finishing, heat treatment, surface treatment, and inspection planning.
Blank preparation, such as bar cutting, forged blanks, cast blanks, turned bar-stock blanks, plate cutting, precision casting, selected powder metallurgy, and injection molding for plastic gears.
Basic machining, such as CNC turning, bore machining, facing, OD machining, hub machining, thread machining, mounting holes, keyway, spline, locating shoulders, and positioning surfaces.
Tooth-form and finishing processes, such as gear hobbing, shaping, milling, shaving, grinding, honing, broaching, wire EDM for special tooth forms, form grinding, worm machining, bevel gear machining, and spiral bevel gear machining.
Heat treatment, such as quenching and tempering, carburizing and quenching, induction hardening, nitriding, carbonitriding, vacuum hardening, tempering, stress relieving, and surface hardening.
Surface treatment, such as black oxide, phosphating, zinc plating, nickel plating, chrome plating, electroless nickel plating, anodizing for aluminum gears, stainless steel passivation, sand blasting, shot blasting, painting, powder coating, rust-preventive oil packaging, and order-specific cleaning or packaging.
The process route depends on gear type, material, size, quantity, precision target, heat treatment, finishing requirements, and inspection scope. These items should be confirmed during RFQ instead of assumed.
Quality Documents and Inspection Requirements
Quality documents should be defined before production. They can affect inspection planning, report content, document format, timing, cost, and supplier qualification.
Inspection reports, FAI, PPAP, COC, traceability records, and other quality documents are order-specific. Buyers should define required documents during RFQ so the inspection plan, report content, document format, timing, and cost impact can be confirmed before production.
Document or record | When to discuss it |
|---|---|
Material Certificate | When material grade, origin, or project traceability must be documented. |
Dimensional Inspection Report | When critical dimensions and tolerances need recorded inspection results. |
Gear Inspection Report | When tooth geometry, runout, tooth profile, lead, or gear-specific inspection data is required. |
Heat Treatment Report / Hardness Report | When hardening, carburizing, nitriding, tempering, or hardness targets affect acceptance. |
Surface Treatment Report | When coating, plating, passivation, black oxide, or corrosion protection must be documented. |
FAI / First Article Inspection | When first-piece approval is required before repeat production. |
PPAP | When required by the customer and applicable to the project. |
COC / Certificate of Conformance | When required by the customer and confirmed during RFQ. |
Traceability records | When the project requires batch, material, process, or inspection traceability. |
If your customer, quality system, or internal approval process requires a specific document, state that requirement in the RFQ.
Prototype, Pilot, and Repeat Production Quantities
Tell the supplier whether the request is for a prototype, pilot build, one-time replacement, or repeat OEM production. Include the immediate order quantity, expected annual demand if available, and any requested timing or project schedule target.
Quantity and expected demand help the supplier evaluate process route, setup assumptions, inspection scope, timing, and quotation basis. Order quantity and schedule should be confirmed during RFQ.
Common RFQ Mistakes That Delay Custom Gear Quotes
Many custom gear quote delays come from missing or unclear scope. Common issues include:
No controlled drawing or revision.
Photos without measurements or operating context.
A worn sample without mating gear or application information.
Missing quantity or annual demand.
Unclear gear type, module or DP, pressure angle, or tooth count.
Missing bore, keyway, spline, hub, shaft, or mounting details.
Missing mating gear data.
Unspecified material, heat treatment, or surface treatment expectations.
Incomplete operating conditions.
Undefined inspection and documentation scope.
Unclear requested timing.
Assuming every supplier quotes the same manufacturing and inspection scope.
Questions to Ask a Custom Gear Supplier
Before placing an order, ask questions that clarify quotation scope and reduce later surprises:
Can you review my drawing or physical sample for manufacturability?
What additional information is needed before quotation?
Which process route is assumed for the quote?
What material, heat treatment, or surface treatment assumptions are being used?
What inspection scope is included?
Which quality documents can be discussed for this order?
How should revisions be handled?
Can the same supplier support prototype, pilot, and repeat production requirements if the project is approved?
These questions help align engineering, purchasing, and quality expectations before production begins.
Where LILY Fits for Custom Gear RFQs
LILY supports industrial custom gear manufacturing for OEM buyers. Projects can be reviewed based on drawings, physical samples, module or DP, pressure angle, tooth count, bore, keyway, mounting structure, operating conditions, quantity, and documentation requirements.
LILY can discuss standard and non-standard gears, including spur gears, helical gears, bevel and miter gears, worm gears and worms, gear racks, fine pitch gears, internal gears, pinion shafts, compound gears, plastic gears, stainless steel gears, and custom gear assemblies, subject to drawing and order requirements.
For suitable projects, LILY can discuss precision gear machining up to Grade 4 / high precision levels, subject to drawing review, gear type, process route, and order-specific inspection requirements. Precision level depends on gear type, size, material, heat treatment, finishing process, inspection scope, and drawing requirements.
LILY Bearing was founded in 2000 and is headquartered in Shanghai, China. The company supplies precision rolling bearings and related industrial components, including gears, and operates under quality systems including ISO 9001, AS9100, and IATF 16949 at the company level. For a specific custom gear order, buyers should confirm applicable documentation, inspection scope, and project-specific quality requirements during RFQ.
FAQ
What information should I include in a custom gear RFQ?
Include a controlled drawing or physical sample, gear geometry, material or process expectations, operating conditions, quantity, requested timing, and quality document requirements.
Can I request a custom gear quote without a drawing?
Yes. A physical sample may help start review, but measurements, material information, mating gear data, operating conditions, and documentation requirements may still be needed.
Can I request a quote from photos only?
Photos can help explain orientation, wear, or mounting context, but final quotation and production scope typically need drawings, samples, measurements, or additional project information.
Should I send CAD files or 2D drawings for a gear quote?
A controlled 2D drawing is preferred for tolerances and revision control. CAD files can support geometry review when available.
What gear dimensions are needed for quotation?
Provide gear type, module or DP, pressure angle, tooth count, face width, OD, bore, keyway, spline, hub, shaft, mounting features, and mating gear data where relevant.
Do I need to know the material and heat treatment before requesting a quote?
Provide known requirements if available. If not, share load, speed, duty cycle, environment, wear or corrosion concerns, and performance expectations for review.
What quality documents should OEM buyers request for custom gears?
Buyers may discuss material certificates, dimensional inspection reports, gear inspection reports, heat treatment reports, hardness reports, surface treatment reports, FAI, PPAP, COC, and traceability records as order-specific requirements.
How does quantity affect a custom gear quote?
Quantity affects process planning, setup assumptions, inspection scope, pricing, timing, and whether the order is prototype, pilot, one-time replacement, or repeat production.
What causes delays in custom gear quotation?
Missing drawings, unclear revisions, no quantity, incomplete operating conditions, missing mating gear data, undefined material or process expectations, and unclear document requirements can slow review.
Can LILY review custom gear RFQs for OEM projects?
Yes. LILY can review drawings, physical samples, gear specifications, operating conditions, quantity, and documentation requirements, then discuss manufacturing options according to drawing and order requirements.
Request a Custom Gear Quote
To request a custom gear quote, send your controlled drawing or physical sample, gear specifications, material and treatment expectations, operating conditions, quantity, requested timing, and required quality documents.
LILY can review the project information and discuss manufacturability, process options, inspection scope, and quotation requirements based on the supplied details. If a drawing is unavailable, send the physical sample and as much application context as possible so the review team can identify what additional information is needed.
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