SINTS (Zhongshan Xintaixing Powder Metallurgy Co., Ltd.) has manufactured precision sintered components since 1995. Metal injection molding, conventional powder metallurgy, CNC finishing, heat treatment and full metallurgical inspection all run inside one 45,000 m² plant in Zhongshan, Guangdong — no brokered processes, no hidden subcontractors.
SINTS started in 1995 as a conventional powder metallurgy press shop supplying lock hardware and appliance components to the Pearl River Delta. Three decades later we still press and sinter — but the business has grown into a full sintered-metal engineering house running two parallel process families under one roof.
Conventional powder metallurgy handles axially simple, high-volume parts: gears, bushings, cams, sprockets, structural brackets. Metal injection molding handles what a press cannot: undercuts, cross holes, thin walls, complex 3D geometry at 0.1–200 g, in full-density stainless and tool steels.
Most of our customers arrive with a part that is being machined, cast, or assembled from multiple pieces — and a cost target that the current process cannot hit. Our job is to tell them, honestly, whether a sintered process will get them there.
Feedstock compounding, injection molding, catalytic and thermal debinding, vacuum and mesh-belt sintering, sinter-hardening, CNC turning and milling, tumbling, passivation, plating coordination, laser marking, sub-assembly and packing — all sequenced on the same site.
That matters for three reasons. Lead times stay predictable because parts never leave the campus. Metallurgical problems get traced in hours rather than weeks, because the same lab tests the powder, the green part, and the sintered part. And pricing stays transparent, because there is no chain of intermediaries adding margin to your part.
Customers routinely audit the plant in person or by live video walk-through. We will show you the sintering furnace logs and the CMM reports for your own part number.
Three decades of adding process capability rather than adding middlemen.
Established as a conventional powder metallurgy press shop serving lock hardware and household appliance manufacturers in Guangdong.
First direct OEM shipments outside China. Export documentation, third-party inspection and English technical support introduced.
Dedicated metal injection molding hall added — feedstock compounding, catalytic debinding and vacuum sintering brought in-house.
Automotive quality management system implemented; PPAP, FMEA, MSA and SPC added to the standard documentation package.
Site expanded to 45,000 m² across eight workshops, with sintering capacity raised toward 1,200 tonnes per year.
CMM, universal testing machine, metallographic microscope, Archimedes density rig and hardness testers consolidated into one lab.
Controlled-cooling sinter-hardening added, removing the separate quench-and-temper step for FLN2-4405 class alloys.
Sample showroom now holds over 10,000 production part references across locks, medical, appliance, power tool and automotive programs.
Two sintering routes, one finishing chain, one inspection standard.
| Process | Typical Part | Weight Range | As-Sintered Tolerance | Practical Volume |
|---|---|---|---|---|
| Metal Injection Molding | Complex 3D geometry, undercuts, thin walls, cross holes | 0.1 – 200 g | ±0.3% – ±0.5% | 3,000 – 5,000,000 pcs/yr |
| Powder Metallurgy (press & sinter) | Gears, bushings, cams, sprockets, structural parts | 1 – 1,500 g | ±0.05 – ±0.1 mm | 10,000 – 10,000,000 pcs/yr |
| Sinter-Hardening | Load-bearing gears and cams needing 30–40 HRC | 5 – 800 g | ±0.08 mm | 50,000+ pcs/yr |
| CNC Finishing | Critical bores, threads, sealing faces on sintered blanks | — | Down to ±0.005 mm | Any |
| Surface & Assembly | Passivation, plating, PVD, laser marking, sub-assembly | — | Per spec | Any |
Full process data sheets: Capabilities · Grade-by-grade property tables: Material Library · Inspection and documentation: Quality System
OEMs and Tier-1 suppliers in 30+ countries, concentrated in five programme types.
| Sector | Representative Parts | Usual Material | Volume Profile |
|---|---|---|---|
| Lock & Security Hardware | Cams, clutch plates, latch bolts, cylinder components, smart-lock drive parts | 17-4PH, 316L, FC-0208 | 200k – 2M pcs/yr |
| Medical Devices | Surgical jaws, ratchets, endoscopic linkages, dental drivers | 316L, 17-4PH H900 | 20k – 300k pcs/yr |
| Power Tools | Planetary gears, clutch cams, hammer components, chuck parts | FLN2-4405, MIM-4605 | 300k – 3M pcs/yr |
| Coffee & Home Appliance | Burr carriers, grinder cams, valve bodies, actuator arms | 316L, 304L, FN-0205 | 50k – 800k pcs/yr |
| Automotive & Industrial | Sensor housings, solenoid cores, seat mechanism parts, oil pump rotors | Fe-2Ni, Fe-3Si, MIM-4140 | 100k – 5M pcs/yr |
If your part is a poor MIM or PM candidate, we say so in the drawing review — not after you have paid for a mold. Roughly one in five enquiries gets told to stay with machining.
Because every process is in-house, there is a single point of accountability for dimensional, metallurgical and cosmetic issues. No supplier finger-pointing.
The IATF 16949 system governs all production, not only automotive lines. Lock and appliance customers get the same SPC, traceability and change control.
Customer-funded tooling is your property, stored under your part number, and never run for another buyer. Tool records and shot counts are available on request.
Technical questions reach a process engineer, not a sales script. Time-zone-aware responses within one working day, in English.
Quotes break out tooling, material, sintering, secondary operations and packaging. You can see exactly where a cost reduction is available at higher volume.
Typical new-part timeline: 5–7 weeks from approved drawing to first article.
Send a 2D/3D file, target volume and material. Within 1–3 working days you get a manufacturability report: process recommendation, tolerance risks, gate and parting line proposal, and an honest go/no-go.
Itemised quote covering tooling, piece price at several volume breaks and secondary operations. Production tooling is cut in 25–35 working days after design freeze.
Samples in 7–10 working days after tool trial, shipped with a full dimensional report. PPAP level 1–3 packages prepared where required.
Scheduled batches with SPC on critical characteristics, batch traceability from powder lot to shipment, and COC with every delivery.
Copies of all certificates are supplied with the first shipment or on request before ordering.
| Standard | Scope | Status |
|---|---|---|
| IATF 16949 | Automotive quality management system — design-excluded manufacture of sintered metal components | Certified |
| ISO 9001 | Quality management system covering the full campus | Certified |
| ISO 13485 practices | Medical-device component production controls (cleanliness, traceability, DHR) | Compatible workflow |
| RoHS / REACH | Material and surface-treatment substance declarations | Declarations issued |
| ISO 2768 / ISO 1101 | General and geometric tolerancing basis for drawings | Applied |
| ISO 2859-1 | Sampling inspection by attributes — standard AQL 0.65 major / 1.5 minor | Applied |
Full inspection equipment list, documentation package contents and audit policy: Quality System →
A direct manufacturer. Feedstock compounding, molding, debinding, sintering, heat treatment, CNC finishing and inspection are all performed on our own 45,000 m² campus. Core processes are never subcontracted, and you are welcome to audit in person or by live video.
Since 1995 — 31 years. Conventional powder metallurgy came first; metal injection molding was added as a dedicated line and now runs in parallel, sharing the same metallurgical lab and inspection standards.
IATF 16949 and ISO 9001. Medical work follows ISO 13485-compatible controls. PPAP level 1–3, FAI reports, material certificates and RoHS/REACH declarations are all available.
Over 30 countries, with the largest volumes in North America, Western Europe, Japan, South Korea and Southeast Asia. EXW, FOB, CIF and DDP terms are all supported.
3,000 pieces per production order once tooling exists. For evaluation, 20–200 prototype pieces can be produced by CNC or soft tooling before committing to a production mold.
Yes — a mutual NDA before drawing review is standard. Customer drawings, tooling and geometry are confidential, and customer-funded tooling is never used for another buyer.
Practical answers for OEM sourcing and engineering teams.
SINTS (Zhongshan Xintaixing Powder Metallurgy Co., Ltd.) was founded in 1995 in Zhongshan, Guangdong, China.
A direct manufacturer. All core processes run in-house on its own campus and are not subcontracted.
45,000 m2 with 380+ staff, 8 production workshops and about 1,200 tonnes per year of sintering capacity.
30+, with the largest volumes to North America, Western Europe, Japan, South Korea and Southeast Asia.
