A lot of sellers find a 1688 factory with a good price, run two or three smooth batches, then blow up a campaign because the factory could not handle a larger order fast enough. The factory was not bad. The seller just never confirmed what it could actually do before depending on it.
Why capacity matters more than price alone
A low price from a small factory is appealing, but when you need to move quickly for a campaign, a shipment that lands two weeks late can wreck the whole thing. Ad spend is running, the deposit is sent, and the warehouse has nothing to ship.
Factory capacity shapes three things that matter in practice: production lead time, quality consistency when volume increases, and whether your order gets priority when the factory is busy. None of these appear on the 1688 product page. You have to ask and read the signals.
Questions worth asking directly
Ask through the 1688 chat or through your order-agent service. You do not need fluent Chinese. Short, specific questions work.
- How many units of this product can you produce per day? This is the core number. A factory doing 200 units a day and one doing 2,000 are completely different partners when you need 3,000 units in two weeks.
- When can you start production on my order? Is raw material already on hand and a line available, or do they need to procure materials first? "Start immediately" and "five days to source materials" translate into very different real timelines.
- What is the actual production lead time for the quantity I need? Not the number listed on the product description page. The number the factory commits to when you confirm your specific order size. The listed figure is usually the best-case, not the average.
- How many concurrent orders are you running right now? Few sellers ask this, but it reveals a lot. A small factory juggling many orders at once tends to run late because labor gets spread thin. A direct answer is a good sign. Evasiveness is a signal.
Reading capacity from 1688 profile data
Beyond direct questions, the factory profile page carries a few numbers worth checking.
Years in operation. A few years does not guarantee quality, but a factory open less than a year typically has unstable production lines and staff. For larger orders, the risk of delays is meaningfully higher.
Total transaction volume and recent order velocity. A factory with strong historical sales but thin recent activity could be scaling back or facing line issues. Steady growth in recent orders suggests equipment and staff are in good shape.
Response rate and response speed. A factory with real capacity tends to reply quickly and consistently. A factory that is slow to respond during the conversation stage is rarely faster during production.
Certifications on the profile page. Not every category requires them, but if your product does (electronics, children's items, food-adjacent goods) and the factory has nothing listed, that is worth pressing before you commit.
When to ask for a factory video
For a first large order (roughly when the shipment value starts to feel significant to your cash position), you can ask the factory to send a short video showing the production line running, raw material stock, or finished goods being packed. Many factories treat this as routine when a serious buyer asks.
The video confirms two things: the factory is real and not a trading company reselling someone else's goods, and the capacity they described looks plausible. You do not need to analyze it deeply. The scale is usually obvious at a glance.
Do not ask for a video on a small test batch. It is not worth the friction. This step makes sense when you have already decided to order a real quantity and want to reduce risk before the deposit transfer.
What a test batch tells you about capacity
A first order, even a small one, gives you real data points about the factory.
Does the factory give you proactive production updates, or do you have to ask? A factory that sends messages like "cutting complete," "sewing in progress," and "packed and ready" is running an organized operation. A factory that goes quiet until you prompt them is usually small, with the same person handling production and customer communication, which creates bottlenecks.
How much did actual delivery deviate from the commitment? One to two days is acceptable. A factory that runs a week late on a test batch will run later on a real order under pressure. Write this number down for every factory you test.
Was quality consistent from the first unit to the last in the batch? Strong first units that get rougher toward the end of the batch signal unstable quality control. At scale this problem multiplies.
Building a real lead time with a safety margin
When a factory quotes a production time, that is usually the optimistic figure: no problems, materials ready, line available. Adding three to five days for a normal order is reasonable. Add more if you are ordering during peak production seasons in China, such as the period before Chinese New Year, when factories are either rushing to close orders or shutting down entirely.
Production time is only one leg. Add: domestic China shipping from the factory to the consolidation warehouse, time for the warehouse to process and pack the shipment, then transit to Vietnam (sea freight is roughly 18 to 30 days depending on the route and service, overland is shorter). Every leg has to run clean for you to hit your target date.
If you are importing for a specific event (a livestream, a flash sale, a seasonal campaign), work backward from the date you need stock in hand, subtract the full lead time, and that is the date you have to place the order.
Keeping records to compare factories
When you are weighing multiple factories for the same product, writing down a few key numbers for each makes the comparison clearer than relying on impression.
- Stated daily output capacity
- Committed lead time for your specific quantity
- Average message response time
- On-time delivery rate from test batches (once you have run one)
- Price at each quantity tier
No factory is perfect across all dimensions. The lowest price often comes with the longest lead time. The fastest to respond may have limited capacity. Knowing what you are trading off lets you match the right factory to the right situation, rather than locking into one and being caught off-guard when your needs shift.
Bottom line
Factory capacity is not something you can read from a product page. You have to ask, run a small test batch, and record real data over time. A factory with genuine capacity does not just deliver the first batch on time. It holds its pace when you need to move fast. Knowing this before you depend on a single factory for a large order keeps you from the situation where your ads are running in Vietnam and your stock is sitting in China.