Medical Tubing RFQ Checklist: Drawings, Materials, Quantity, and Inspection Needs

Introduction

Sending a clear RFQ for medical tubing is the single most effective step to get comparable quotes and avoid hidden surprises. This checklist covers the fields that engineering, quality, and procurement teams should prepare — for stainless steel capillary tubing, small-diameter precision tubes, nitinol components, and related processing services. The recommendations focus on metal tubing for medical device components, not finished sterile devices, and do not replace the OEM’s own regulatory review.

1. Drawings and Technical Specifications

A complete dimensional drawing is the foundation of any usable quotation. At minimum, include:

• Outer diameter (OD) — nominal value and tolerance, e.g. Ø1.50 ±0.03 mm
• Inner diameter (ID) or wall thickness — specify which two of the three you are controlling; for capillary tubing OD 0.30–6.00 mm, tighter ID tolerances generally require honing or mandrel drawing
• Length — cut length with tolerance; indicate pre-assembly or final component dimension
• Surface roughness (Ra) — for sliding fits, fluid paths, or sealing surfaces; typical drawn tube ID Ra is 0.8–3.2 µm depending on material and reduction
• Straightness — important for tubes that feed into automated assembly fixtures
• End condition — square cut, deburred, chamfered, or faced; state maximum burr height if critical (e.g. ≤0.05 mm)
• Critical-to-function features — mark dimensions that affect assembly, flow, or sealing

If you cannot share a full drawing at RFQ stage, a dimensioned sketch with tolerances is still far more useful than a verbal description. For more on preparing dimensional data, see our guide on how to specify OD, ID, wall thickness, and tolerance for medical tubing.

2. Material and Grade

State the material clearly — “stainless steel” or “medical grade” leave too much room for interpretation:

• Alloy designation: e.g. 304 (UNS S30400), 316L (UNS S31603), 316LVM (ASTM F138), Nitinol (ASTM F2063), 17-4PH, cobalt-chromium L605
• Product form: seamless or welded-and-drawn; seamless is preferred for high-pressure or fatigue-sensitive paths, welded-and-drawn can be cost-effective for structural applications
• Applicable standard: e.g. ASTM A269, ASTM A213, ASTM F138, ASTM F2063, ISO 5832-1
• Condition: annealed, cold-worked, or stress-relieved — affects formability, hardness, and downstream processing
• Surface: bright annealed, pickled, or as-drawn; bright annealed is common for tubing that will undergo further cleaning

Ask the supplier to state the actual mill source and standard on the material certificate, not just the alloy name. The OEM is responsible for verifying material suitability under applicable medical device regulations. For 304 vs 316L selection guidance, see our 304 vs 316L stainless steel capillary tubes comparison.

3. Quantity, Batch Size, and Forecast

Quantity drives tooling, pricing, and scheduling. Provide:

• Prototype quantity: e.g. 50–200 pieces for fit-and-function testing
• Pilot batch: e.g. 500–2,000 pieces for process validation builds
• Target annual volume: e.g. 50,000 pcs/year — helps the supplier propose appropriate tooling
• Order frequency: monthly, quarterly, or annual blanket order with call-offs
• MOQ preference: state a ceiling if you have one

If annual volume is uncertain, share a range (e.g. 10,000–50,000 pcs/yr). This lets the supplier quote both manual and semi-automated processing options.

4. Processing and Secondary Operations

List all operations the supplier needs to perform or coordinate:

• Cutting: specify method preference — abrasive saw, EDM, or laser cut for burr-sensitive ends
• Deburring: mechanical, electrochemical, or thermal; note if internal bore deburring is required
• End forming: flaring, swaging, reducing, or beading
• Bending: centerline radius, bend angle, tolerance; multi-bend parts need a bend table or 3D model
• Laser processing: hole drilling, slotting, marking — specify tolerance and positional accuracy
• Welding or brazing: tube-to-tube or tube-to-fitting; state joint design and acceptance criteria
• Cleaning: ultrasonic, passivation, or cleanroom-level final clean
• Marking: laser, inkjet, or electrochemical etch; include font size and location

If the supplier will manage outside processes (coating, electropolishing, heat treating), ask them to identify which steps are in-house versus subcontracted. For clean cutting details, see our article on burr-free cutting for medical tubes.

5. Inspection and Quality Requirements

Clarify what must be measured, recorded, and reported — this directly affects pricing:

• Dimensional inspection plan: which dimensions are 100% checked, which are sampled, and the sampling plan (e.g. ANSI/ASQ Z1.4, AQL 1.0 normal)
• Material certificates: EN 10204 3.1 or mill test report with heat number, chemistry, and mechanical properties
• Surface inspection: visual at defined magnification, or quantitative roughness measurement
• Certificate of Conformance (CoC): per shipment, confirming parts meet drawing and PO requirements
• First Article Inspection (FAI): per AS9102 or your own format — first shipment only or per lot
• Process capability: Cp/Cpk for critical dimensions if the part goes into a validated assembly
• Cleanliness verification: particle count, non-volatile residue; state standard and acceptance limit
• NDT: dye penetrant, eddy current, or pressure test — only if function requires it

Ask for a sample inspection report format to avoid paying for a custom quality plan. For more on documentation, see medical tubing material certificates: what OEM buyers should ask for.

6. Cleaning, Packaging, and Labeling

Define the condition parts must arrive in:

• Cleaning level: commercially clean, precision-cleaned to a particle spec, or processed in ISO Class 7/8 cleanroom for final steps
• Packaging: individual compartments, bulk with interleaving, vacuum-sealed, or VCI bags for corrosion-prone materials
• Labeling: part number, revision, quantity, heat/lot number, date; barcode or QR code if your system requires it
• Export packaging: moisture barrier bags, desiccant, ISPM 15 crates for international shipments

State whether parts will be sterilized by your facility after receipt. The supplier must deliver parts clean enough to enter your sterilization process without additional pre-cleaning. Our article on medical tubing export packaging covers cross-border shipping in more detail.

7. Timeline and Commercial Terms

• Prototype delivery date: for fit check
• Pilot/production delivery dates: aligned to your validation schedule
• Incoterms: e.g. FCA supplier, FOB port, or DAP your facility
• Payment terms: state preference (e.g. T/T 30% upfront, 70% before shipment)
• LTA interest: if you plan to lock pricing for 12–24 months, mention it

8. What to Request from the Supplier in Return

An RFQ is a two-way exchange. Ask the supplier to include in their quotation:

• Quoted OD/ID/wall thickness tolerances and any deviations from your drawing
• Material source: mill name, country of melt, traceability to heat number
• Manufacturing process flow: key steps and which are in-house vs. subcontracted
• Inspection equipment list with relevant resolution
• Standard QC documentation provided with each shipment
• Lead times for prototype, pilot, and production
• Payment terms and volume price breaks
• MOQ and whether it changes for repeat orders
• Shelf life or storage conditions if applicable

A supplier who answers these questions clearly demonstrates the communication discipline needed for a medical device supply relationship. Vague responses at RFQ stage often predict problems later.

Summary RFQ Checklist

Copy or adapt this quick checklist:

• ☐ Drawing or sketch: OD, ID/wall, length, tolerances, surface finish, end condition
• ☐ Material: alloy and standard (e.g. 316L per ASTM A269, seamlessly drawn)
• ☐ Quantity: prototype, pilot, annual estimate, order frequency
• ☐ Processing: cutting, deburring, end forming, bending, laser, welding, cleaning, marking
• ☐ Inspection: dimensional plan, sampling level, CoC, material cert type (3.1 or MTR)
• ☐ FAI requirement: AS9102 or custom, first shipment only or per lot
• ☐ Cleanliness: commercially clean, precision-cleaned, or cleanroom-processed
• ☐ Packaging: individual, bulk, vacuum-sealed; labeling with heat/lot, part number, quantity
• ☐ Timeline: prototype and production delivery dates
• ☐ Commercial: Incoterms, payment terms, LTA interest, MOQ

A well-prepared RFQ reduces turnaround time, makes competing offers directly comparable, and signals that your project is serious. If you have a drawing or specification ready, submit it with the checklist fields above to receive a specification-matched quotation.