Small quantities cost more per part because the fixed costs of an order, such as programming, fixturing, setup, first-piece inspection, and material minimums, are divided across fewer pieces. The time to actually cut each part changes very little with quantity, so the difference in unit price comes almost entirely from those fixed costs.
Engineers ordering prototypes and buyers ordering spares often see unit prices that look high compared with production pricing. This page explains why, shows how quantity breaks work, and lists practical ways to lower the cost of low-volume machined parts.
Fixed costs that do not scale with quantity
| Fixed cost | Description |
|---|---|
| Quoting and order processing | Drawing review, estimate, order entry, traveler creation |
| CAM programming | Toolpaths written for each operation |
| Fixturing | Soft jaws or custom fixtures made for the part |
| Machine setup | Tools loaded, offsets set, workholding mounted |
| First-piece inspection | First part measured before the lot runs |
| Material minimums | Distributors sell full bars or minimum cuts; drops may not be reusable |
| Outside processing lot charges | Heat treaters and platers often have minimum lot charges |
| Documentation | Cert packages and FAI cost about the same for 1 part or 100 |
How quantity breaks work
When a shop quotes quantity breaks, it spreads the same fixed costs over each quantity. As quantity rises, unit price falls quickly at first, then levels off as it approaches the true run cost per part. The steepest drop is usually between 1 and about 25 pieces. Beyond a few hundred pieces, further savings come mostly from process improvements such as dedicated fixtures, unattended running, or combining operations.
The same effect appears on outside processing. A heat treat lot charge that is small on 200 parts can be larger than the machining cost of a single prototype.
Prototype pricing
A first prototype carries more than a normal setup. The shop may need to model the part, program it from scratch, develop workholding, and prove out a new process. If the design will change, that work may be repeated on the next iteration. Prototype prices are higher for these reasons, not because the shop charges differently for small orders.
Ways to lower the cost of small quantities
Order for a longer horizon
If you will need 40 parts this year, ordering 40 at once is usually cheaper than four orders of 10. A blanket order with scheduled releases gets the lower price without taking all parts at once, depending on the arrangement.
Combine revisions and part numbers
Freeze the design before ordering several prototypes, and group similar parts in the same order so material and setups can be shared where possible.
Simplify the part
Fewer setups, fewer tool changes, and fewer tight tolerances reduce both setup and run cost.
Use common materials and finishes
Common bar sizes and grades avoid minimum-buy penalties. Removing an unneeded finish avoids an outside processing lot charge.
Match the part to the right machine
Small turned parts can often run complete on a Swiss-type machine from bar, and turned parts with milled features can finish on a lathe with live tooling. Fewer operations means less setup. See our Swiss machining and CNC turning pages.
When a higher unit price is the right choice
Ordering larger quantities is not always correct. Inventory ties up cash, parts can become obsolete after a revision, and storage has a cost. For a design that is still changing, paying a higher unit price for a small lot is often the better decision. The goal is to choose the quantity deliberately, with the quantity breaks in front of you, rather than defaulting to the smallest possible order.
Small-quantity checklist
- Request quantity breaks on every quote.
- Estimate annual use and consider a blanket order.
- Freeze the revision before ordering multiples.
- Review tolerances and finishes for necessity.
- Use common stock grades and sizes where the design allows.
- List documentation needs up front so they are priced once.
Small orders at Wexmar
Wexmar has no minimum order and accepts one-offs. Programs and setup notes are saved for every part, so reorders at the same revision cost less to set up. Prototype and production work run on the same equipment, so a part proven as a prototype moves into production without a new process. More on our capabilities page.
Getting a quote
Ask for several quantity breaks so you can see where unit price levels off. You can upload a drawing for an instant estimate or call (315) 400-2654 to discuss quantities with an estimator.