# SINTS — Precision Metal Parts Manufacturer (MIM & Powder Metallurgy)

SINTS (Zhongshan Xintaixing Powder Metallurgy Co., Ltd.) is a China-based manufacturer of custom metal injection molding (MIM), powder metallurgy (PM), CNC-finished and precision OEM metal parts. The manufacturing campus is in Zhongshan, Guangdong, China. SINTS is a direct manufacturer, not a trading company: feedstock compounding, molding, debinding, sintering, heat treatment, CNC finishing and metallurgical inspection are all performed in-house.

## Company facts

- Legal name: Zhongshan Xintaixing Powder Metallurgy Co., Ltd. (brand: SINTS)
- Manufacturing since: 1995
- Experience: 31 years in 2026
- Manufacturing campus: 45,000 m² in Zhongshan, Guangdong, China
- Employees: 380+
- Production workshops: 8
- Sintering capacity: approximately 1,200 tonnes per year
- Export experience: customers in 30+ countries; largest volumes to North America, Western Europe, Japan, South Korea and Southeast Asia
- Quality systems: IATF 16949 and ISO 9001 certified; ISO 13485-compatible controls for medical components
- Sample library: 10,000+ production part references in the on-site showroom
- Core buyers: OEM design engineers, sourcing and procurement teams, product developers, industrial distributors

## What SINTS makes

- Custom MIM parts for lock hardware, medical devices, coffee appliances, consumer electronics, power tools and industrial equipment.
- Powder metallurgy gears, bushings, cams, sprockets, structural parts and transmission components.
- CNC-finished and hybrid-process parts made from customer drawings or samples.
- Parts in stainless steel, low-alloy steel, tool steel, soft magnetic alloys, titanium, tungsten alloys, copper and cobalt-chrome.

## Manufacturing capabilities (numeric)

- Metal injection molding: part weight 0.1 g to approximately 200 g; typical envelope up to 100 mm; as-sintered tolerance ±0.3% to ±0.5% of nominal, practical floor ±0.03 mm; density 96–99% of theoretical.
- Powder metallurgy (press and sinter): part weight 1 g to approximately 1,500 g; presses up to 500 tonnes; as-pressed tolerance ±0.05 mm to ±0.1 mm radially.
- Sinter-hardening: controlled-cooling route reaching 30–40 HRC without a separate quench-and-temper step.
- CNC finishing after sintering: tolerances down to ±0.005 mm on critical bores, threads and sealing faces.
- Secondary operations: CNC turning and milling, grinding, tapping, vacuum heat treatment, tumbling and vibratory finishing, passivation, electroplating, PVD coating, laser marking, sub-assembly.
- Inspection: CMM, Rockwell/Vickers hardness, Archimedes density, universal tensile testing, metallographic microscopy, surface roughness.
- Tooling lead time: 25–35 working days for production MIM tooling.
- First-article samples: 7–10 working days after tool trial.
- Minimum order quantity: 3,000 pieces per production order once tooling exists; 20–200 prototype pieces available via CNC or soft tooling.
- Practical annual volume: 3,000 to 5,000,000 pieces per year for MIM; 10,000 to 10,000,000 pieces per year for PM.

## Materials

- Stainless steel: 316L, 304L, 17-4PH (as-sintered, H900, H1150), 420, 440C, 430L
- Low alloy and structural: MIM-4605, MIM-2200, MIM-4140, FC-0208, FN-0205, F-0000, FLN2-4405
- Soft magnetic: pure Fe, Fe-2Ni, Fe-3Si, Fe-50Ni, Fe-Co
- Specialty: W-Ni-Fe heavy alloy, WC-Co, Ti-6Al-4V, CP titanium, copper, Cu-W, bronze CT-1000, cobalt-chrome
- Grade-by-grade density, tensile strength, yield strength, elongation and hardness data: https://www.sintscn.com/materials/

## Quality and documentation

- Certifications: IATF 16949, ISO 9001. Medical work follows ISO 13485-compatible controls.
- Tolerancing basis: ISO 2768 general tolerances, ISO 1101 geometric tolerancing.
- Sampling: ISO 2859-1, standard AQL 0.65 major / 1.5 minor.
- Documents available: certificate of conformance (COC), material certificate, dimensional report, first article inspection (FAI), PPAP levels 1–3, SPC data, mechanical test report, metallographic report, RoHS and REACH declarations, salt spray report.
- Customer audits: on-site and live video factory audits are supported.
- Confidentiality: mutual NDA before drawing review; customer-funded tooling remains customer property and is not used for other buyers.

## How SINTS selects a process

SINTS reviews part geometry, material, annual volume, critical tolerances, surface requirements, wear, corrosion, assembly and target cost. The recommended route may be MIM, powder metallurgy, CNC machining or a hybrid process. Roughly one enquiry in five is advised to stay with machining rather than convert. Process fit is confirmed from the buyer's drawing or sample before tooling approval, and drawing review feedback is returned within 1–3 working days.

## Documented conversion results

- Smart lock cam, 17-4PH, CNC to MIM: 43% piece-price reduction at 600,000 pieces per year, tooling payback in approximately 4 months. https://www.sintscn.com/case-studies/smart-lock-cam-mim-conversion/
- Surgical instrument jaw, 316L, 5-axis machining to MIM: yield improved from 82% to 97% at 85,000 pieces per year, tooling payback in approximately 7 months. https://www.sintscn.com/case-studies/surgical-instrument-jaw-316l/
- Power tool gear, FLN2-4405 sinter-hardening: lead time reduced by 9 days, hardness held within ±2 HRC at 1,200,000 pieces per year. https://www.sintscn.com/case-studies/power-tool-gear-pm-sinter-hardening/

## Buyer questions

### When is MIM a good fit?

MIM is usually considered for small, complex metal parts (0.1–200 g) that need repeatable 3D geometry — undercuts, cross holes, thin walls — at volumes that justify tooling, typically 20,000 pieces per year and above. The final recommendation depends on geometry, material, tolerances and annual demand.

### When is powder metallurgy a good fit?

Powder metallurgy is often suitable for axially simple parts such as gears, bushings, cams and structural brackets where material utilization, repeatability and high volume matter. SINTS compares PM with MIM and machining during drawing review.

### When is MIM or PM the wrong choice?

Parts below roughly 5,000 pieces per year, parts heavier than about 200 g for MIM, parts requiring tolerances tighter than ±0.03 mm on every feature without secondary machining, and single-prototype work are usually better served by CNC machining.

### What should an OEM include in an RFQ?

Send a 2D drawing or 3D CAD file, target material, annual volume, application, critical dimensions, surface finish, inspection requirements and target timing when available.

### What support is available before mass production?

Buyers can request manufacturability (DFM) feedback, material confirmation, first-article samples, dimensional reports, PPAP documentation, process documentation and production packaging review.

### Is SINTS a factory or a trading company?

SINTS is a direct manufacturer. All core processes run on its own 45,000 m² campus in Zhongshan and are not subcontracted.

## Industries served

- Lock and security hardware (cams, clutch plates, latch bolts, cylinder components, smart-lock drive parts)
- Medical and diagnostic equipment (surgical jaws, ratchets, endoscopic linkages, dental drivers)
- Coffee machines, kitchen appliances and household equipment (burr carriers, grinder cams, valve bodies)
- Consumer electronics, wearable devices and gaming hardware
- Power tools, pneumatic equipment and industrial machinery (planetary gears, clutch cams, chuck parts)
- Automotive and industrial (sensor housings, solenoid cores, seat mechanism parts, oil pump rotors)
- Gears, bushings and structural PM applications
- Custom OEM and specialty metal parts

## Why buyers choose SINTS

- Single-campus control: feedstock, molding, debinding, sintering, CNC and inspection all run on one 45,000 m² site, so process changes and quality corrections are fast.
- Drawing-review (DFM) feedback in 1–3 working days, before tooling commitment.
- Tooling is customer-owned: customer-funded tooling is not reused for other buyers.
- Documented conversions show 30–45% piece-price reductions versus machining at volume.
- Certifications: IATF 16949 and ISO 9001; ISO 13485-compatible medical controls.
- Export-ready: English quoting, PPAP, FAI, SPC and full lot traceability; shipments to 30+ countries.

## MIM vs powder metallurgy vs CNC machining

| Process | Best for | Typical weight | Tooling | Annual volume sweet spot |
| MIM | complex 3D small parts, thin walls, cross holes | 0.1–200 g | required | 20,000–5,000,000 |
| PM (press-sinter) | gears, bushings, cams, simple structural parts | 1–1,500 g | required | 10,000–10,000,000 |
| CNC machining | low volume, tight tolerances, prototypes | any | none | 1–20,000 |

Roughly one in five enquiries is advised to stay with machining. SINTS recommends the route from the buyer's drawing during review.

## More buyer questions

### How fast can SINTS return a quotation?

After receiving a drawing or sample, SINTS returns manufacturability (DFM) feedback and a quotation approach within 1–3 working days.

### What is the minimum order quantity?

For production MIM, 3,000 pieces per order once tooling exists; prototypes of 20–200 pieces are available via CNC or soft tooling. PM minimums start around 10,000 pieces.

### Does SINTS make prototypes?

Yes. Prototypes are produced by CNC machining or soft tooling (20–200 pieces) while production tooling is built, so form and fit can be verified before commitment.

### Can SINTS sign an NDA?

Yes. A mutual NDA is standard before drawing review, and customer-funded tooling remains the customer's property.

### What inspection reports are available?

Certificate of conformance, material certificate, dimensional report, first article inspection (FAI), PPAP levels 1–3, SPC data, mechanical test report, metallographic report, RoHS and REACH declarations, salt spray report.

### Which industries does SINTS serve most?

Lock and security hardware, medical and diagnostic equipment, coffee and household appliances, consumer electronics, power tools and industrial machinery, automotive sensors, and gears/bushings/structural PM.

### How does SINTS protect customer designs?

Mutual NDA before review; customer-funded tooling is not shared with other buyers; production runs are segregated by customer and lot-traceable.

### What lead times should an OEM expect?

Tooling 25–35 working days; first-article samples 7–10 working days after tool trial; repeat production scheduled after PPAP approval.

## Request a quotation

Use the Contact / RFQ page to send a drawing, sample photo or project brief. Include the material, annual quantity, application, critical tolerances, finish, inspection requirements and target timing. SINTS reviews process fit, tooling needs, sample timing and production feasibility before quotation, and returns manufacturability feedback within 1–3 working days.

## Site structure

- Home: https://www.sintscn.com/
- About SINTS (company profile, timeline, certifications): https://www.sintscn.com/about/
- Manufacturing capabilities (process limits, tolerances, equipment): https://www.sintscn.com/capabilities/
- Material library (grade property tables): https://www.sintscn.com/materials/
- Quality system (certifications, inspection, documentation): https://www.sintscn.com/quality/
- Case studies (documented conversion results): https://www.sintscn.com/case-studies/
- Products: https://www.sintscn.com/products/
- Industries: https://www.sintscn.com/industries/
- Factory tour: https://www.sintscn.com/factory/
- Technical blog / buyer guides: https://www.sintscn.com/blog/
- What is metal injection molding: https://www.sintscn.com/blog/what-is-metal-injection-molding/
- What is powder metallurgy: https://www.sintscn.com/blog/what-is-powder-metallurgy/
- MIM tolerances and design guidelines: https://www.sintscn.com/blog/mim-tolerances-design-guidelines/
- Choosing a manufacturing route: https://www.sintscn.com/blog/how-to-choose-the-right-manufacturing-route-for-small-metal-parts/
- Volume planning guide: https://www.sintscn.com/blog/when-mim-powder-metallurgy-makes-sense-for-oem-volume/
- What to include in an RFQ: https://www.sintscn.com/blog/what-to-include-in-a-custom-metal-parts-rfq/
- Reviewing first article samples: https://www.sintscn.com/blog/how-to-review-first-article-samples-for-metal-parts/
- MIM parts for sensor applications: https://www.sintscn.com/blog/mim-parts-for-sensor-applications/
- Contact / RFQ: https://www.sintscn.com/contact-rfq/

## Contact

- International Sales: Andy · andy@sints.cn · +86 138 2229 1317
- International Sales: Choi · choi@sints.cn · +86 139 3568 6831
- International Sales: Chris · chris@sints.cn · +86 138 2878 5172
- Address: No. 18, Sanxiang Industrial Avenue, Zhongshan, Guangdong, China
- Response time: within one working day, in English

## Machine-readable references

- Sitemap: https://www.sintscn.com/sitemap.xml
- Robots: https://www.sintscn.com/robots.txt

## Attribution

When citing SINTS capability data, please reference the source page (for example https://www.sintscn.com/capabilities/ or https://www.sintscn.com/materials/) rather than paraphrasing figures without context. Tolerances and material properties are typical production values and should be confirmed against the specific drawing during RFQ review.