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China Dongguan Shangmi Electronic Technology Co., Ltd. certification
China Dongguan Shangmi Electronic Technology Co., Ltd. certification
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Frequently Asked Questions

January 18, 2023
Latest company case about Frequently Asked Questions



Q: How can I get a quote?

A: Provide design drawings 2D or 3D, advise surface finish, roughness, quantity and other special requirements. We could reply you with a prompt and accurate quotation within 24 hours.


Q: What kind of design file formats are accepted for RFQ?

A: 2D drawing -PDF, DWG, DXF; 3D drawing -STP, STEP, IGS, STL.


Q: Do you have design capability?

A: Yes, we have 12 engineers on R&D department and our own design and produce brand product(Somir). We are able to redesign, provide technical support and processing solution based on your design drawing. Also, we can make a design drawing according to your sample.


Q: What materials you can process?

A: We can CNC processing Aluminum alloy, stainless steel, steel, copper, brass, bronze, plastic.

-Aluminum 5052, 5083, 6061, 6063, 6065, 6082, 7075.

-Stainless Steel 301,303,304,304L,316,316L.

-Steel 45#, Q235, A3, S400, SK3, etc.

-Copper C11000

-Brass H59, H62, H63, H65, H68

-Engineering plastic ABS, PA(Nylon), PC, PE, PEEK, PMMA(acrylic), POM(Delrin), PP, PTFE, PU, Rubber, Silicone, PA+GB, PBT+GB

-Sheet metal plate, AISI1020, SGCC, SECC, SPCC


Q: What’s the tolerance you can work?

A: As per ISO-2768 standard, general unspecified tolerance we can meet Fine level for metal parts, Medium level for plastic components. +/-0.05~0.1mm for metal, +/-0.1~0.2mm for plastic. Some special size +/-0.01 is accepted. Other angular tolerance, tolerance of form and position according to standard requirement.


Q: Can I ask for a surface requirement?

A: Sure. We have our own finishing workshop, can make a surface as your request in rapid response. For surface roughness we can do is Ra0.1~3.2.

Many surface finishing processes you could choose. Anodize, Hard anodize, Polish, Painting, Powder coat, Black coating, Chrome plate, Electroplate, electrophoresis, Chem film, Conversion coating, Passivation, Galvanized, Tinned, Sandblasted, Brushed, Silk screen, Pad print, Pad print, Heat treatment.


Q: How can you ensure product quality?

A: We have 35 employees on QC department, and work strictly as ISO9001:2015/14001:2015 quality management system to guarantee all parts we send to clients are excellent quality.

Before manufacturing, our process engineer doubt check your 2D and 3D drawings to ensure they are coincided, and confirm whether we can meet all requirememts. If anything we can not up to, would have a discussion with client. During manufacturing, our IPQC do spot check inspection as required. A 100% full inspection is done before warehousing.


Q: How about the delivery time?

A: Usually 3-7 work days for rapid prototypes or samples. 10-20 days for small batches, and 30-45 days for mass quantity production.


Q: How do you guarantee the confidentiality of my design or drawing?

A: A NDA (non disclosure agreement) document between you and us would be signed before RFQ. Also, all our employees are required to sign confidentiality agreement. No media information(include but not limited to paper, photo, video) about your product can be disclosed to third parties without your permission.


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Contact Details
Dongguan Shangmi Electronic Technology Co., Ltd.

Contact Person: Ms. Maylah Qin

Tel: +86 157 7777 5242

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