These Cnc Machined Surgical Instruments are custom metal components for forceps, retractors, trocars, and robotic end-effectors. We hold tolerances to ±0.005 mm (half a human hair), surface finish dow
These Cnc Machined Surgical Instruments are custom metal components for forceps, retractors, trocars, and robotic end-effectors. We hold tolerances to ±0.005 mm (half a human hair), surface finish down to Ra 0.2 µm, and a hardness range of 40–48 HRC on martensitic stainless. Lead time is 3–5 working days for prototypes, with zero-runout machining on rotating shafts.
Autoclave cycles destroy soft steels. We default to 17-4 PH H900 for its 40–48 HRC hardness and corrosion resistance after 500+ steam cycles. For cutting edges, we switch to 440C hardened to 58 HRC. If you need non-magnetic properties for MRI-guided surgery, we use Nitronic 60. Every grade is mill-certified and traceable to the heat number.
We run 20 five-axis DMG MORI and Fanuc machines. A single setup eliminates re-clamping errors, which is how we hold true position within 0.01 mm on angled jaw serrations and curved shafts. For a 150 mm-long forceps jaw, we achieve a straightness of 0.008 mm over the entire length. This is precision manufacturing without hand-polishing guesswork.
Raw machined steel has free iron on the surface—it corrodes and fails biocompatibility tests. We passivate per ASTM A967 (nitric acid, 30 minutes) to remove free iron. Then we electropolish to Ra 0.2 µm, which reduces bacterial adhesion by 90% compared to a Ra 0.8 µm finish. If you need a matte finish to reduce glare under surgical lights, we micro-bead blast before passivation.
We do not ship without a full report. Each batch goes through a Zeiss CMM for 12–20 critical dimensions, a Keyence vision system for edge radius and burr detection (0.02 mm max), and a Rockwell hardness test on a sacrificial sample. You receive a PDF inspection report with every part number, serial number, and measured value. No exceptions, regardless of order size.
A hinge pin at ±0.005 mm ensures smooth rotation without slop. But we also use a 0.02 mm clearance on mating surfaces—this prevents binding when the instrument is under load. The table below shows what we actually guarantee, not just what we can achieve on a good day.
| Specification | Our Capability | Standard Range |
|---|---|---|
| Machining tolerance (linear) | ±0.005 mm | ±0.01 mm |
| True position (hole-to-hole) | 0.01 mm | 0.02 mm |
| Surface finish (electropolished) | Ra 0.2 µm | Ra 0.4–0.8 µm |
| Hardness (17-4 PH H900) | 40–48 HRC | 28–34 HRC (annealed) |
| Hardness (440C cutting edge) | 58 HRC | 50–55 HRC |
| Runout (on rotating shafts) | 0.005 mm TIR | 0.02 mm TIR |
| Straightness (150 mm length) | 0.008 mm | 0.05 mm |
| Max part size | 500 mm x 300 mm x 300 mm | — |
| Lead time (prototype) | 3–5 working days | 2–3 weeks |
| MOQ | No MOQ—single piece accepted | 50–100 pcs |
Before you send a drawing, check our CNC cutting tool selection guide to understand how tool geometry affects your part's edge quality. For deeper details on how we interpret GD&T symbols, read our CNC machining tolerances guide.
Our finished parts survive 500 autoclave cycles at 134°C without pitting or discoloration. We run a 10-cycle accelerated test on every new geometry before production. If you use ETO or gamma sterilization, we adjust the passivation recipe accordingly—gamma radiation can darken 17-4 PH, so we pre-oxidize to match your final color.
Most factories demand 100-piece minimums. We don't. Send one prototype drawing, we machine one part, you test it in your lab. Once validated, we scale to your volume using the same fixtures and programs—zero process drift. This is how we build long-term supply relationships from a single sample.
No MOQ. We machine one part for prototype validation, then scale to any volume—100 or 100,000 pieces.
Yes, we copy from your 3D model or reverse-engineer from a physical sample within ±0.01 mm, including internal cooling channels and serration patterns.
Every part, even a one-off, goes through the same CMM inspection, hardness test, and visual burr check as a mass production batch—you get the same PDF report.
3–5 working days for standard stainless steel, plus 1 day for passivation and electropolishing. Complex multi-axis parts with tight true position take up to 7 days.
Send your drawing for a firm quote within 12 hours. Email sc@bquq.com or WhatsApp +86 13713157787. We reply with DFM feedback, a fixed price, and a delivery date—no vague estimates.
| Parameter | Capability |
|---|---|
| Materials | AL6061/7075, SUS303/304/316, 45# steel, T2 copper, H59 brass, POM, PEEK, nylon |
| Tolerance | ±0.005mm standard, ±0.003mm on request |
| Machines | 3/4/5-axis CNC, turn-mill, Swiss lathe |
| Surface | Anodizing, nickel, zinc, passivation, sandblast, polish |
| Size Range | Max 400 x 300 x 200 mm |
| Prototype | 72 hours, no MOQ on samples |
| Inspection | Full report per batch, CMM data on request |
