Specifications
| Item | Detail |
|---|---|
| Material | 17-4PH (H900 / H1025), AISI 420, AISI 316L |
| Process | Silica sol lost wax investment casting; H900 or H1025 precipitation hardening |
| Dimensional tolerance | ISO 8062 CT4-CT6 as cast; critical bores and spline seats machined to +/- 0.02 mm |
| Surface finish | Ra 3.2-6.3 um as cast; electropolished down to Ra 0.4 um; passivation per ASTM A967 |
| Machining | 5-axis CNC milling and turning, drive spline, cross holes, deburring, laser marking |
| Weight range | 0.08 kg – 0.65 kg per piece |
| Inspection & certificates | CMM report, XRF alloy verification, dye penetrant, hardness map, EN 10204 3.1, PPAP/FAIR on request |
Key features
- Cast spline and flute seat geometry produced net shape, which removes 2 to 3 machining setups and keeps the cutting edge seats concentric with the drive axis within 0.02 mm.
- 17-4PH H900 gives 40-44 HRC with a passive chromium oxide surface. We offer H1025 where revision reamers need higher impact toughness.
- Electropolishing after passivation removes embedded iron and free iron particles, cutting the risk of fretting debris at the hub to shaft interface.
- 5-axis machining holds the bore to shaft fit without secondary jig boring, so modular reamer heads index repeatably across a set.
- Moreover, heat-lot level identification lets us trace every finished hub back to the melt and the hardening batch.
Applications
- Intramedullary reamer head hubs for femoral and tibial canal preparation
- Modular reamer systems for hip and knee revision instrument sets
- Coupling hubs for flexible shaft driven canal reamers
- Generally, Single use and reusable orthopedic reamer assemblies
- Trial instrument hubs used in trauma and joint replacement sets
Quality & compliance
Ningbo Ruican operates under IATF 16949 and ISO 9001 quality management. Additionally, we deliver every shipment with EN 10204 3.1 documentation. In general, we prepare PPAP or FAIR documentation on request for new part introductions. Honest scope statement: Ningbo Ruican is not an ISO 13485 contract manufacturer;
it supplies project-level ISO 13485 documentation under the customer’s Quality Agreement, covering 17-4PH
H900/H1025, AISI 420 and AISI 316L with ISO 10993-5 support. Biocompatibility testing, sterilization validation
and regulatory submission remain the responsibility of the device manufacturer.
FAQ
What tolerance can Ningbo Ruican hold on a reamer head hub bore?
Moreover, we produce as-cast geometry to ISO 8062 CT4-CT6. After 5-axis CNC machining, functional bores, spline seats and
bearing faces are held to +/- 0.02 mm, with concentricity confirmed by CMM on every production lot.
Which material do you recommend, 17-4PH H900 or H1025?
H900 is the default for reusable cutting hubs because it delivers 40-44 HRC and good wear resistance at the
spline. H1025 is selected when the hub sees impact loading or when the customer needs a better combination of
toughness and corrosion resistance after repeated sterilization.
Do you supply passivation and electropolishing in house or through partners?
Generally, passivation per ASTM A967 is performed as a standard step after machining. Electropolishing is offered on the
same routing for parts that need Ra 0.4 um or better, and both operations are recorded in the batch traveler.
Can you work from a sample instead of a drawing?
Yes. Ningbo Ruican supports OEM and ODM programs from either a 3D model, a 2D drawing or a physical sample,
including reverse engineering with 3D scanning and a first article report before tooling release.
What is the typical tooling and sampling lead time?
Tooling for a silica sol lost wax reamer hub is normally completed in 3 to 5 weeks, followed by 2 to 3 weeks for
first article sampling, heat treatment validation and dimensional reporting.
Is cleanroom packaging available?
Yes. Cleanroom-compatible packaging with double bagging, heat-lot labelling and particulate-controlled handling
is available on request and is documented in the packing record.
Send your drawing or sample for a quotation – Wendy She — sales@cnsandcasting.com — WhatsApp +86-13777124360
