As a leading custom metal fabrication supplier based in China, we provide end-to-end manufacturing solutions for businesses requiring high-precision metal components. Our 12,000㎡ facility houses 50+ CNC machining centers, automated sheet metal lines, and professional welding stations.

Whether you need rapid prototyping, low-volume production, or mass manufacturing, we deliver parts with tolerances as tight as ±0.005mm. We serve industries including automotive, aerospace, medical devices, electronics, and industrial equipment.

Key advantages of working with us:

• Factory-direct pricing – save 30-40% compared to local suppliers

• 100% inspection with CMM (Coordinate Measuring Machine)

• 7-day sample lead time for urgent projects

• No minimum order quantity (MOQ)

Core service capabilities

2.1 CNC Machining Services

Our CNC machining center handles complex geometries with high repeatability.

Capabilities:

• CNC Milling: 3-axis, 4-axis, and 5-axis

• CNC Turning: Diameter up to 500mm, length up to 1000mm

• CNC Grinding: Surface and cylindrical grinding

Materials:

Precision:

• Tolerances: ±0.005mm to ±0.01mm

• Surface roughness: Ra 0.2 – 3.2μm

2.2 Sheet Metal Fabrication

We transform flat metal sheets into finished enclosures, brackets, and chassis.

Processes:

• Laser Cutting: Up to 20mm thickness for mild steel, 12mm for stainless steel

• Bending: Up to 200 tons press brake, max length 3000mm

• Punching: Turret punching for complex hole patterns

Typical products:

• Electrical enclosures and control cabinets

• Automotive brackets and mounting plates

• Medical device chassis

• HVAC components

2.3 Metal Welding & Assembly

Our certified welders handle both structural and cosmetic welding.

Welding types:

• TIG welding (stainless steel, aluminum, titanium)

• MIG welding (mild steel, galvanized steel)

• Spot welding for sheet metal assemblies

• Robotic welding for high-volume consistency

Post-weld services:

• Stress relieving

• Grinding and polishing

• Assembly with hardware (rivets, threaded inserts, standoffs)

2.4 Surface Finishing

We offer a full range of surface treatments to enhance appearance and corrosion resistance.

Product Specifications Table

Application Cases

Case 1: Automotive Sensor Housing

• Material: Aluminum 6061-T6

• Process: CNC milling + anodizing (black)

• Quantity: 5000 pcs/month

• Challenge: Required tight tolerance of ±0.01mm on internal bores

• Result: Achieved 99.8% yield rate, delivered in 25 days

Case 2: Medical Device Enclosure

• Material: Stainless Steel 304

• Process: Laser cutting + bending + TIG welding + electropolishing

• Quantity: 200 pcs prototype

• Challenge: No visible weld marks, clean surface for medical environment

• Result: Passed customer inspection with zero defects

Case 3: Industrial Robot Arm Bracket

• Material: Stainless Steel 17-4 PH

• Process: 5-axis CNC machining + heat treatment

• Quantity: 1000 pcs

• Challenge: Complex curved surface with ±0.02mm tolerance

• Result: On-time delivery, customer reordered 5000 pcs

Quality assurance and testing capabilities

We understand that quality is your top priority. Every order follows our 6-step quality control process:

1. Incoming material inspection – Verify material certificate and dimensions

2. In-process inspection – First article inspection (FAI) at machine setup

3. Routine patrol inspection – Every 2 hours during production

4. Final inspection – 100% critical dimensions checked

5. CMM full measurement – Sample parts from each batch

6. Outgoing quality control – Packaging and labeling verification

Available inspection equipment:

• CMM (Coordinate Measuring Machine) – Accuracy ±0.002mm

• Profile projector – For complex contours

• Roughness tester

• Hardness tester (Rockwell, Vickers)

• Thread gauge set

Deliverables with each order:

• Full dimensional inspection report

• Material certificate (EN 10204 3.1)

• Surface roughness report (if applicable)

• PPAP Level 3 (upon request)

Why choose us?

1. Engineering support before production
Our team of 15+ engineers reviews your drawings for manufacturability (DFM) and suggests cost-saving modifications – free of charge.

2. Transparent pricing
No hidden tooling fees or setup charges. You receive a detailed quote with line-by-line breakdown.

3. Shorter lead times
Typical lead time is 30% faster than industry average due to our in-house tooling and 24/5 production schedule.

4. Low MOQ, high flexibility
We accept orders starting from 1 piece for prototyping. No minimum quantity for production orders.

5. Secure packaging & shipping
Anti-rust paper + foam padding + export-grade carton + wooden case for heavy parts. We ship via DHL, FedEx, UPS, or sea freight.

6. After-sales support
If any part does not meet your specifications, we will remake it at no cost or issue a full refund.

（FAQ）

Q1: What file formats do you accept for quoting?
A: We accept STEP (STP), IGES (IGS), SolidWorks (SLDPRT), AutoCAD (DWG, DXF), and PDF. For complex assemblies, please include a STEP file of the full model.

Q2: Do you offer free samples?
A: We do not offer free samples for custom parts due to material and setup costs. However, we deduct the sample cost from your first production order if you proceed within 30 days.

Q3: What is your typical lead time?
A: Samples: 7-15 days depending on complexity. Production: 20-30 days for 500-5000 pcs. Rush service (5-day sample) is available for an additional fee.

Q4: Can you work with my existing 3D model?
A: Yes. We can work directly with your CAD files. Our engineers will contact you if any modifications are needed for manufacturability.

Q5: Do you ship internationally?
A: Yes. We ship worldwide via air (DHL/FedEx/UPS, 3-7 days) or sea freight (15-30 days). We handle all export documentation.

Q6: How do I protect my intellectual property?
A: We sign an NDA before any design files are shared. All customer data is stored on encrypted servers with access restricted to assigned project engineers.

Q7: What payment methods do you accept?
A: T/T (bank transfer), PayPal, credit card, and Alibaba Trade Assurance. For first-time orders, we require 50% deposit, 50% before shipment.

Q8: Do you offer assembly or kitting services?
A: Yes. We can assemble components, install hardware (rivets, threaded inserts), and package kits according to your BOM.

Call to Action and Contact Information

Ready to start your custom metal fabrication project?

Follow these 3 simple steps:

1. Send your drawings – Email your CAD files to sales@yourcompany.com

2. Receive quote within 24 hours – We review and send detailed pricing

3. Production & delivery – Approve sample, mass production, shipping

Contact Information

📧 Email: manager@bjjcen.com
🌐 Website: www.jiachengen.com
📍 Address: [Room 401, 07 Office Building, Phase I Greenland Central Plaza, Tongzhou District, Beijing]

Request a Free Quote Today

Please include the following information when you contact us:

• CAD files (STEP or IGES preferred)

• Material requirement (or let us recommend)

• Quantity needed

• Desired surface finish

• Any special requirements (tolerance, lead time, certification)

Our engineering team will respond within 24 hours with a detailed quote and DFM suggestions.