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How quantity changes the price of a machined part

July 7, 2026

Unit price on machined parts does not slide down a smooth curve. It falls in steps, and each step happens when a different cost stops dominating. Knowing where those steps sit lets you order at the right quantity instead of the quantity you first thought of.

The four zones

1 to 10 pieces: setup is everything. Programming, fixture and first article are spread over almost nothing. The unit price looks absurd compared with the material, and that is normal. Buy at this quantity to prove a design, not to compare suppliers.

10 to 100: setup still matters, process is simple. Shops use soft jaws and simple fixtures. The unit price falls fast across this range. This is where most first production orders sit.

100 to 1,000: process investment starts to pay. A dedicated fixture, better tooling and optimised cycle times become worth the engineering. If a shop is willing to invest here, the price step can be substantial.

Above 1,000: cycle time is king. The conversation moves to seconds per part, machine choice, bar feeding, multi-spindle work and automation. Design changes that save ten seconds are now worth discussing.

What actually falls and what does not

Cost element	Behaviour with quantity
Programming	Fixed, spread thinner
Fixture	Fixed, may increase if a better one is justified
First article	Fixed
Machine time per part	Falls a little with optimisation, then flattens
Material per part	Flat, small improvement on bulk buying
Finishing	Falls until the finisher’s minimum batch is passed, then flat
Inspection	Falls if sampling replaces piece by piece checks

That table explains most of what buyers find confusing. Doubling from 50 to 100 can cut the unit price noticeably. Doubling from 1,000 to 2,000 often barely moves it, because by then almost nothing fixed is left to spread.

How to ask for pricing that is useful

Do not ask for a price. Ask for a small table.

Please quote 100, 250, 500 and 1,000 pieces, and state which quantity the fixture cost assumes. If a different fixture would change the price at 1,000, quote both.

Three things come from that:

1. You see where the break points are on your specific part
2. You learn how much of the price is setup, which tells you whether to consolidate orders
3. You find out whether the shop thinks in terms of process investment at all, which is a useful signal about the shop

Blanket orders and releases

If you use parts steadily, ask about a blanket order: one purchase order at a volume price, released in batches across a year. The shop gets a committed quantity and can buy material once and build a fixture. You get the volume price without holding all the stock.

Agree three things in writing: the total quantity, the release schedule and what happens if you do not take the full volume. That last point is where blanket orders go wrong.

Prototype pricing is not a preview

The price you pay for five prototypes tells you almost nothing about production. Buyers sometimes judge a shop on a prototype quote and pick the cheapest, then discover that the shop has no process to scale.

A better test at prototype stage is to ask two questions: what would you do differently at 500 pieces, and what would the price be. A shop that answers with a fixture plan and a number is one you can grow with. A shop that says the price stays the same has not thought about it.

When smaller is actually better

Ordering more is not always right. Order smaller when:

• The design is not frozen
• The part is new to this shop and unproven
• The material is expensive and cash matters
• Storage or shelf life is a real constraint, which applies to some plastics and coated parts

Splitting a first production order into two releases, with inspection between them, costs a little in unit price and removes a large amount of risk.

Planning a year instead of an order

If a part is going into steady use, one conversation at the start is worth more than a year of quarterly haggling. Ask the shop to price three scenarios:

1. Order by order. What you pay if each release is treated as a new job.
2. Blanket order with releases. One committed quantity, material bought once, fixture justified, parts delivered on a schedule.
3. Consignment or buffer stock. The shop holds finished stock and you draw from it, paying as you take.

The gap between one and two is usually large. The gap between two and three is usually small and mostly about who carries the inventory.

Questions that reveal how a shop thinks about volume

• What quantity would justify building a dedicated fixture for this part?
• What is the cycle time now, and what would it be with that fixture?
• Is there a design change that would let you run this from bar instead of block?
• At what quantity would you move this to a different machine?

A shop that answers these in specifics is a shop that can grow with your part. A shop that treats 50 pieces and 5,000 pieces as the same job with a different multiplier will be the wrong supplier by the second year.

The guide on what drives the price explains the underlying lines, and comparing quotes covers how to read the answers when they arrive. To get pricing at several quantities on your own part, send the drawing and list the quantities in the description.

Questions we get on this

Keep reading

• What machining in Vietnam actually costs, and where the saving goes
• Minimum order quantity in machining, and why it is really a value