When you ask three Chinese CNC shops for a quote on the same batch of aluminum housings, you get back three different numbers. Not because their machining rates differ by 30%. Because one quoted EXW, another quoted FOB, and the third bundled freight into CIF without telling you.

That spread between the lowest and highest unit price can hit 40%. And most of that gap has nothing to do with the actual machining. It's the three capital letters hidden inside the number.

I've shipped thousands of CNC parts from our shop floor in Dongguan to customers in California, Stuttgart, and Melbourne. I've watched buyers lose money on EXW deals they thought were cheap. I've watched smart buyers use FOB to cut their landed cost by 15-25% without touching the machining price. This is the conversation I have with every new customer who asks "what's the difference between your FOB price and their EXW price?"

The four terms, explained without the textbook language

Incoterms exist because a CNC part has to travel through six hands before it reaches your loading dock: the factory floor, the truck to port, Chinese export customs, the ocean vessel, destination customs, and the final truck to your warehouse. Each of the four common terms draws a line somewhere in that chain and says "supplier pays everything before this line, buyer pays everything after."

EXW (Ex Works) — The line is at the factory gate. You pay for everything from the moment the parts leave our shop floor. Trucking to port, export clearance, ocean freight, import clearance, final delivery. All on you. The EXW unit price looks the cheapest on paper because it covers the least. It almost never is.

FOB (Free On Board) — The line is at the ship's rail in the Chinese port. We pay for factory-to-port trucking, Chinese export customs clearance, and port handling charges. You pay for ocean freight, cargo insurance, destination customs, and final delivery. This is the pricing structure where you control what matters and we handle what we know best.

CIF (Cost, Insurance, Freight) — The line is at your destination port. We pay for everything FOB covers, plus ocean freight and minimum insurance. The quoted unit price bundles freight at whatever rate the supplier's forwarder charges, which is rarely the market rate. You handle destination customs and final delivery.

DDP (Delivered Duty Paid) — The line is at your door. The supplier handles everything including import duties and taxes. Convenient, and priced accordingly: suppliers typically add 25-40% contingency on top of estimated duties and fees because they take on destination-country import risk they do not fully understand.

Term Factory to port Export customs Ocean freight Insurance Import customs Final delivery Who controls the forwarder
EXW Buyer Buyer Buyer Buyer Buyer Buyer Buyer
FOB Seller Seller Buyer Buyer Buyer Buyer Buyer
CIF Seller Seller Seller Seller Buyer Buyer Seller
DDP Seller Seller Seller Seller Seller Seller Seller

Five reasons FOB wins for CNC parts buyers

Every term has a use case, but for a buyer importing machined parts from China, FOB is the pricing structure that gives you the most leverage. Here is why.

1. You control the freight forwarder

When you buy FOB, you choose who moves your parts across the ocean. You are not paying the supplier's "partner" forwarder a 15-20% markup that is invisible inside a CIF quote. You get market rates directly.

A 500 kg pallet of CNC parts from Shenzhen to Los Angeles costs roughly $380-450 via LCL sea freight at market rates. The same shipment bundled inside a CIF quote often lands at $550-650. On a $3,000 parts order, that hidden $200 freight markup is 6.7% of your total cost, spent on nothing of value.

More importantly, when you own the forwarder relationship, you get direct communication. A delay at the port? Your forwarder calls you. A customs hold? You know the same day. Under CIF, the forwarder reports to the supplier, and you hear about problems days later — if at all.

2. You consolidate shipments from multiple suppliers

This is the big one if you buy from more than one Chinese shop, which you should for anything beyond simple parts. Risk management means not putting every drawing in one factory.

With FOB, three different suppliers ship to the same forwarder's consolidation warehouse near the port. The forwarder combines everything into one container or one consolidated LCL shipment. You pay one freight bill instead of three. You track one shipment instead of three. Your broker clears one entry instead of three.

With EXW, you would need to arrange three separate factory pickups from three locations. With CIF, each supplier bundles their own freight at their own marked-up rate — you pay three markups. With FOB, you consolidate and typically save 30-50% on total logistics cost versus paying three separate freight bills.

3. FOB prices are directly comparable

FOB Shenzhen: $12.50 per part from Supplier A.
FOB Shenzhen: $11.80 per part from Supplier B.

These two numbers mean the same thing. Both include raw material, machining labor, tooling amortization, quality inspection, export-grade packaging, domestic trucking to the port, Chinese export customs clearance, and terminal handling charges. The difference is machining cost plus margin. That is what you want to compare.

EXW prices are not comparable because they exclude different things depending on the factory's location. A Dongguan factory quoting EXW and a Suzhou factory quoting EXW have completely different trucking costs to port, but the unit price hides that. CIF prices are not comparable because each supplier uses a different forwarder at a different negotiated rate. Only FOB strips the price down to what you are actually buying: machining capability.

4. You avoid the DDP pricing trap

DDP sounds great. Parts appear at your door. No logistics to manage.

The reality: suppliers price DDP at cost plus a 25-40% risk buffer because they become the Importer of Record in your country. They do not know your country's customs enforcement patterns. They do not know which brokers are reliable in your port. They price for the worst case because the worst case comes out of their margin if they guess wrong.

A $4,000 CNC order quoted DDP might land at $5,200-5,600. The same order quoted FOB Shenzhen at $4,000 plus your own freight ($350), insurance ($45), customs clearance ($125), and duty (varies, but typically 0-5% on CNC parts) lands well under $5,000 total. You pay a $400-800 premium for DDP convenience on a single mid-sized order.

There is also a compliance risk most buyers overlook. When the supplier is the Importer of Record, they control what gets declared on the customs entry. If they misclassify your parts to reduce their duty cost, and customs audits the entry later, the liability is on your company as the ultimate consignee — not on the supplier who signed the forms.

5. The risk transfer point is clean

Under FOB, the supplier's responsibility ends when the goods cross the ship's rail at the port of loading. Until that moment, any problem — truck accident, port congestion, customs inspection delay at export — belongs to the supplier. After that moment, your cargo insurance covers the goods.

This handoff is legally unambiguous. A thousand cases of maritime law have tested exactly where FOB responsibility transfers. Under EXW, the handoff is at the factory gate and everything after is your problem from 8,000 miles away — including a truck breakdown between Dongguan and Shenzhen that you cannot do anything about. Under CIF, the supplier arranges freight but the risk technically transfers at the same point as FOB, creating a weird split where the supplier picks the carrier but you bear the in-transit risk.

EXW: the price tag that lies

I see this every week. A buyer sends me a competitor's quote: "$8.50 EXW, you are at $9.80 FOB. Why are you 15% higher?"

Let us add up what EXW actually costs for a 500-piece aluminum parts order:

Your real pre-freight total: roughly $4,465 to $4,615. Per part: $8.93 to $9.23.

The FOB quote at $9.80 already includes all five items. The actual gap between EXW and FOB was never $1.30. It was $0.57 to $0.87. And you did zero extra work to get there.

Plus: if anything goes wrong between the factory gate and the port — a truck gets delayed, customs flags the shipment for inspection, the port is congested and storage charges start accruing — on EXW terms, you are paying demurrage and detention from 8,000 miles away with no local leverage. On FOB, the supplier owns that risk and has local relationships to resolve it.

CIF: when the supplier's freight arrangement is not your friend

CIF is the most common misdirection in CNC part quoting because it sounds helpful: "Don't worry, we handle the shipping for you."

The problem is not that CIF is unfair. It is that the incentive structure is wrong. The supplier picks the forwarder, but you bear the in-transit risk. The forwarder works for the supplier — if there is a delay, the forwarder calls the supplier, the supplier decides whether to tell you. You have no direct channel.

The bundled freight rate is the second problem. A CIF quote at $21.80 per part includes freight at whatever rate the supplier's forwarder offers. You cannot see the freight component, so you cannot negotiate it. If the forwarder is charging the supplier $550 for freight and marking it up to $650 inside your CIF price, that $100 is invisible to you.

The third problem is insurance. Standard CIF insurance covers 110% of the invoice value under Institute Cargo Clauses (C) — the narrowest coverage level. It covers total loss of the vessel and not much else. It excludes partial damage, theft, water damage from heavy weather, and rough handling. For CNC parts with ±0.01mm tolerances, where one dropped crate means $5,000 of scrap aluminum, this is not adequate coverage.

There is one valid use case for CIF: sample orders under $2,000 where the logistics overhead of managing your own forwarding is not worth the time. For anything above that threshold, FOB plus your own All Risks cargo insurance costs less and protects more.

Real numbers from a real shipment

Here is an order we shipped in June 2026. Same parts, quoted two ways, full landed cost calculation.

Order specs:

FOB route:

Cost item Amount Who pays
FOB Shenzhen unit price (200 pcs) $3,700 Buyer
LCL sea freight Shenzhen → LA $285 Buyer
Cargo insurance (All Risks, 110% value) $42 Buyer
US customs clearance (broker fee) $125 Buyer
US import duty (aluminum parts, 2.5%) $92.50 Buyer
Trucking LA port → Phoenix warehouse $180 Buyer
Total landed cost $4,424.50
Cost per finished part $22.12

CIF route (same parts, competitor quote):

Cost item Amount Who pays
CIF Los Angeles (200 pcs) $4,360 Buyer
US customs clearance $125 Buyer
US import duty (2.5% on CIF value) $109 Buyer
Trucking LA → Phoenix $180 Buyer
Total landed cost $4,774
Cost per finished part $23.87

FOB saves $349.50 on this one $4,400 order — about 8%. On a $20,000 production run, the FOB advantage scales to roughly $1,500 or more, because the freight markup and duty-on-freight compound with volume.

The FOB negotiation playbook

Many Chinese CNC shops default to EXW or CIF in their initial quote because those terms are simpler to calculate. Getting FOB requires asking for it. Here is the exact language that works:

"Please quote this FOB Shenzhen. I will use my own forwarder for the ocean leg. I need the unit price through to vessel loading only."

This signals three things to the supplier: you understand international logistics, you are not going to argue about freight markups later because you are not paying them, and you are a serious buyer who has done this before.

If the supplier pushes back with "our EXW price is lower," show them the math from the EXW section above. The gap between EXW and FOB on a typical CNC order is $0.40-0.90 per part — the domestic logistics cost that you would pay either way, just wrapped differently.

If the supplier pushes CIF, tell them your forwarder runs consolidated shipments and you need FOB pricing for comparison with other suppliers. Most shops switch to FOB immediately once they know they are being compared against other FOB quotes.

One important nuance: FOB requires you to have a freight forwarder. If this is your first time importing from China, spend 30 minutes getting quotes from three forwarders before you send your first RFQ. Having a forwarder ready makes the FOB negotiation real instead of theoretical.

What "export standard" packaging actually requires

A quick word on packaging, because it affects your freight cost as much as your Incoterm, and your FOB quote should specify it.

CNC parts come off the machine clean and precise. Ocean freight is 3-6 weeks of vibration, humidity cycling, and forklift operators who do not know or care what is inside the crate. The crate is part of the product.

Your FOB price should explicitly include export-grade packaging:

We use 12mm plywood with internal bracing and screw-down lids. It sounds like overkill until you see what a standard wooden crate looks like after six weeks at sea and three forklift transfers. Solid packaging costs $15-30 per crate and prevents hundreds of dollars in scrap.

Sea vs Air vs Express: the decision that follows your FOB terms

FOB pricing is independent of your freight mode choice, but you need to pick the right mode for the timeline:

Mode Transit time Cost for CNC parts Right for
Sea freight LCL 25-40 days $0.50-1.00/kg Production orders above $2,000; planned ahead
Air freight 5-8 days $3.50-6.00/kg Prototypes, urgent tooling replacements, first-article samples
Express (DHL/UPS/FedEx) 3-5 days $6-12/kg Under 25 kg of small parts; above 30 kg, air freight wins on price

The break-even where air freight beats express on cost is roughly 25-30 kg. Below that, use DHL. Above that, get an air freight quote from your forwarder. Above 150 kg, sea freight starts to dominate on cost and the decision becomes timeline versus budget.

One-page FOB buyer checklist

Before you accept a FOB quote, verify these six things:

1. Port is specified. "FOB Shenzhen" is not the same as "FOB Shanghai." The port determines your forwarder's pickup location and your freight cost. If the quote just says "FOB China," ask which port.

2. Packaging standard is in writing. Export plywood crate, VCI corrosion protection, ISPM-15 stamped, foam inserts. Get it specified on the quote or PO.

3. Export documentation is included. Commercial invoice, packing list with weights and dimensions, and Certificate of Origin if your country offers duty reduction under a trade agreement. All of these should be included in the FOB unit price.

4. HS code is confirmed. Ask the supplier for the HS code they will use for Chinese export. Cross-check it against your country's import tariff schedule. An HS code mismatch between export and import is the most common cause of customs delays on CNC parts.

5. Forwarder introduction happens early. Connect your forwarder with the supplier's shipping department at least one week before the goods are ready to ship. The handoff from factory to forwarder is where most FOB shipments develop problems.

6. You arrange your own cargo insurance. Do not rely on the supplier's minimum CIF coverage if you negotiated FOB. All Risks coverage, 110% of invoice value, from port of loading to your receiving dock. It costs roughly 0.3-0.5% of the shipment value.

The bottom line

FOB is not the cheapest-looking number on a quote sheet. EXW wins that game every time — and that is exactly why some suppliers lead with EXW. It makes their price look lower than it really is.

But FOB is the pricing structure where you, the buyer, control what happens to your parts after they leave the machine shop floor. You pick the forwarder. You negotiate the freight rate. You decide whether to ship by sea or air. You own the cost visibility and the communication chain.

The next time you send an RFQ to a Chinese CNC shop, add these five words: "Please quote FOB Shenzhen." It tells the supplier you understand international procurement, and it saves you 8-15% on landed cost compared to letting the shop handle shipping their way.

Have a shipment to sort out? We quote all our CNC machining work FOB Shenzhen by default — the price you see covers everything through to vessel loading, so you can compare us directly to any other FOB quote. Send us your drawing and we will get you a line-by-line quote within 24 hours.