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OEM manufacturing · Built to your drawings
OEM Injection Molding: Build-to-Print Tooling, Molding & Assembly
Have drawings or a sample? Hongqing tools, molds and assembles to your design. Send your 3D files: our engineers run a design-for-manufacturing (DFM) review, then build and trial the mold in our own mold shop, and start production once you approve the samples. Molds are held to ±0.01 mm and up to 1.5 m; 90+ presses from 80T to 1300T; pilot runs from 100 pieces; you own the mold.
We'll sign an NDA before you send drawings · Or email info@dghongqing.com
In-house toolroom, ±0.01 mm
90+ presses, 80T–1300T
You own your molds
Reply within 1 business day
Who this is for
You have a design and need a factory that can tool and mass-produce it
From single parts to finished products: order molded parts only, or hand us molding, finishing and assembly together.
Complete 3D files
Straight to DFM review
Send STEP, IGS, X_T or STL files; our engineers check structure, draft, wall thickness and tolerances, suggest changes and a mold layout, then quote.
Only 2D drawings or a sample
We complete the data for tooling
We check whether the information is enough to build a mold; our mechanical engineers fill in the missing 3D data, and once you confirm it we do the DFM review and quote.
Need finished products
Finishing and assembly follow molding
Painting, silk screen and pad printing, UV printing, laser marking, heat-staked inserts and full assembly all happen on the same site, followed by inspection, packing and shipment.
Production process
Six steps from drawing to shipment, each with a deliverable
After each step we send you the results to approve before moving on.
01
DFM review
We check wall thickness, draft, undercuts, gate and parting line locations and tolerances, then suggest changes and a mold layout. You receive: our DFM review.
02
Written quote and contract
Based on cavities, steel and process, we quote the mold and unit price in writing in US dollars; tooling starts once the 50% mold deposit is paid. You receive: the quote and contract.
03
Mold design and manufacturing
Designed and machined in our own toolroom, commonly in S136 steel, to ±0.01 mm and up to 1.5 m. Tooling takes from 30 days. You receive: a finished mold that belongs to you.
04
Mold trial and sample approval
We trial the mold on 80T–1300T presses, check dimensions, appearance and fit, and send you T1 samples to approve, adjusting and re-trialing if needed. You receive: T1 samples and inspection results.
05
Injection molding production
Production matches the approved samples, commonly in ABS, PC, PP, PA, POM, TPE or TPU, with two-shot and insert molding available; production runs start at 2,000 pieces. You receive: parts that match the approved sample.
06
Finishing, assembly and shipping
Painting, printing, laser marking, assembly and packing; sampling inspection per GB/T 2828.1 (ISO 2859-1) AQL or your standard; FOB or EXW, and we can arrange sea, air or express shipping. Deliverable: inspected finished goods.
DFM review
Eight things our DFM review checks before tooling
Fixing these on the drawing costs almost nothing; fixing them after tooling means mold changes and delays.
Wall thickness
Is the wall even? Too thick causes sink marks; too thin causes short shots.
Draft angles
Enough draft on side walls to avoid drag marks, sticking and ejector stress marks.
Undercuts
Where slides or lifters are needed, and whether a design change can remove them to cut mold cost.
Gates and weld lines
Where to gate, and how to keep weld lines and gate marks off cosmetic surfaces.
Parting lines
Whether parting and witness lines affect appearance or feel.
Ejection
Ejector pin layout and method, so cosmetic faces stay free of pin marks and stress whitening.
Cooling and warpage
Warpage risk on large flat, long or thin-walled parts, and how cooling should be laid out.
Tolerances and fit
Whether critical dimensions and clearances can be held consistently, and whether snap fits and screw bosses assemble.
Manufacturing
Tooling, molding, finishing and assembly on one site
No need to manage separate mold, molding, painting and assembly suppliers; any outsourced process, such as electroplating, is disclosed in advance.
In-house toolroom
Sodick EDM and wire EDM and Makino high-speed machining centers, holding ±0.01 mm on molds up to 1.5 m with slides, lifters and multiple cavities.
Explore mold making →
Molding floor
90+ presses from Sumitomo, Haitian, Kawaguchi and others, 80T–1300T, including 40+ above 300T, 7 two-shot and 5 vertical machines.
Explore injection molding →
Surface finishing
6 robotic spray painting lines, 30+ pad printers and 7+ automatic silk screen printers, plus UV printing, laser marking and conductive coating.
Explore finishing →
Assembly workshop
5 assembly lines in an enclosed workshop with an air shower, from heat-staked inserts to full product assembly, testing and packing.
Explore assembly →Key figures
OEM production at a glance
Our current factory resources and terms. You are welcome to verify them on site or by video audit.
File formats
3D: STEP, IGS, X_T, STL; 2D: DWG, DXF, PDF
Molds
In-house toolroom, ±0.01 mm, up to 1.5 m; slides, lifters, inserts, multi-cavity
Mold steel and life
Commonly S136; 500,000-shot life
Molding presses
90+, 80T–1300T (40+ above 300T, 7 two-shot, 5 vertical)
Materials and processes
ABS, PC, PC/ABS, PP, PA, POM, TPE, TPU; two-shot, insert molding, overmolding
Finishing and assembly
Painting, silk screen, pad printing, UV printing, laser marking, conductive coating; 5 assembly lines
Tooling lead time
From 30 days
Minimum order (MOQ)
Pilot run from 100 pcs; production from 2,000 pcs
Production lead time
Quoted per product once samples are approved
Payment
Mold: 50% deposit; parts: 50% deposit, balance before shipment
Terms and shipping
FOB or EXW; we can arrange sea, air or express shipping
Quality control
Sampling per GB/T 2828.1 (ISO 2859-1) AQL or your standard; ISO 9001, ISO 14001, ISO 45001, IATF 16949
Have drawings? Send them for a DFM review and quote
Our Sales Manager, Coya Xiang, replies within one business day, and we can sign an NDA first if you need one.
Costs
What drives the mold cost and the unit price
Knowing these helps you control cost at the design stage; after reviewing your 3D files we send a written quote in US dollars.
Mold cost
A one-off investment that you own
Driven mainly by part size, number of cavities, steel grade, the number of slides and lifters, surface texture, and whether overmolding or two-shot molding is needed. Tooling starts after a 50% deposit, and you can take the mold with you.
Unit price
Per piece, lower at higher volumes
Driven mainly by material and weight, cycle time, finishing, assembly steps and order quantity. Production starts at 2,000 pieces; if you need fewer, tell us the quantity and we'll explain the effect on unit price.
See pricing and MOQ →
What does Hongqing's DFM review check before build-to-print tooling?
Hongqing runs a DFM (design for manufacturing) review before tooling any OEM project. It checks eight things: wall thickness, draft angles, undercuts, gates and weld lines, parting lines, ejection, cooling and warpage, and tolerances and assembly. You receive the review comments and suggested changes before the quote, and the mold quote is based on the reviewed mold design. Fixing these issues at the drawing stage costs almost nothing; fixing them after tooling means mold rework and delays. The review needs a 3D file (STEP, IGS, X_T or STL), ideally with a 2D drawing showing key dimensions and tolerances.
Can Hongqing make a mold from only 2D drawings or a physical sample?
Hongqing can start an OEM project from 2D drawings or a physical sample, and our mechanical engineers build the 3D data needed for tooling. We first check whether your material is enough to tool from; once the missing 3D geometry is modeled and you approve it, we run the DFM review and quote. The modeling effort and cost are stated in the quote. Please mark key dimensions and how parts fit together on the sample, and add tolerances to 2D drawings, so the 3D model stays true to your original design.
How are mold cost and unit price calculated for an OEM project?
Hongqing quotes OEM projects in two parts. The mold is a one-time cost based on part size, number of cavities, steel grade, number of slides and lifters, surface texture, and whether overmolding or two-shot molding is needed; you own the mold. The unit price is per piece and depends on material and part weight, cycle time, finishing, assembly steps and order quantity, falling as volume rises. After reviewing your 3D files and completing the DFM review, we issue a written quote in USD. Tooling starts after a 50% mold deposit; production orders take a 50% deposit with the balance paid before shipment.
How soon do I get samples after OEM tooling starts, and what if they have problems?
Hongqing's OEM tooling takes from 30 days. When the mold is finished, we run trials on our 80T–1300T presses, check dimensions, appearance and fit, and send you the T1 samples with the inspection results for approval. If samples show flash, sink marks, warpage or fit issues, we find the cause, then rework the mold or adjust the process and run another trial; you approve the fix first. If the change comes from a design revision on your side, we explain the impact on time and cost before proceeding. After reviewing your files, we give you a schedule that includes trials and sample approval.
What is the minimum order quantity for OEM production?
Hongqing's OEM production starts at 2,000 pieces, and pilot runs start at 100 pieces; the larger the order, the lower the unit price. Many customers run a small pilot batch first to check assembly, packaging and market response, then move to full production with the same mold, so no new tooling is needed. If you need fewer than 2,000 pieces, tell us the quantity and expected annual volume, and we will explain how quantity affects the unit price before quoting.
Send us what you have. We'll map out the route to mass production.
Wherever you are in development, we'll propose the right manufacturing plan, from early design review through tooling and molding to finishing, assembly and shipping, and move your project step by step to mass production.
Helpful to include: sketches, drawings or 3D files, annual volume and target market.
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