Guides / Materials

Materials for Swiss Machining and What Each One Costs You

September 20, 2026

Material is the second largest line on most Swiss machining quotes, after machine time, and it influences the first one too. A grade that cuts fast shortens the cycle. A grade that work hardens lengthens it, wears tools faster and forces gentler parameters.

This guide goes through the materials that actually run on Swiss-type lathes, what each does to your part price and where bar stock adds cost you may not have expected.

Two costs, not one

Material reaches your quote twice.

The bar you pay for. Price per kilogram, plus a premium for the condition the machine needs. When the shop runs with a guide bushing, the bar must be straight and held to a close diameter tolerance, usually centerless ground, which costs more per meter than standard drawn bar. Add the bar remnant the machine cannot use and the cut off width lost on every part. On cheap brass this is noise. On titanium or a certified medical alloy it is a real share of the price. The article on guide bushing mode explains why the bar condition depends on how the part runs.

The seconds the grade adds. Machinability sets surface speed, feed rate and how often an insert gets changed. At 50,000 pieces a year, a grade that adds four seconds to the cycle adds over 55 machine hours.

That second cost surprises buyers more often. The cost guide shows how cycle time dominates the price once volume climbs.

What machinability means here

Machinability rating is a rough index, with free cutting brass near the top and materials like titanium and 316L much lower. On a Swiss machine three specific behaviors matter more than the index.

Chip breaking. Swiss machines run unattended with a bar feeder. A grade that produces long stringy chips wraps them around the part and the tool, and someone has to intervene. Free machining grades include additives that break chips into small pieces, which is why they run so well here.

Work hardening. Some stainless grades and nickel alloys harden where the tool has already passed, so the next pass cuts a harder surface. This forces heavier feeds and sharper tools, and it punishes any dwell.

Heat. Titanium and austenitic stainless conduct heat poorly, so heat stays in the cutting zone rather than leaving with the chip. That limits speed and shortens tool life.

The grades that run

Free cutting brass

C360 is the reference point for cheap Swiss parts. It cuts at high speed, breaks chips into small pieces, leaves a good finish with no extra pass and gives long tool life. Cycle times are the shortest you will see. Typical uses are fittings, connector bodies, valve components and instrument parts.

If your part can be brass and does not need the corrosion resistance or strength of stainless, quote it in brass. The difference is usually large.

Lead free brass grades exist for drinking water and RoHS driven applications. They machine noticeably less easily than leaded C360, so do not assume the same price.

Stainless steels

The most common family on Swiss machines, and the widest spread in cost between grades.

303 is the free machining austenitic grade, with sulfur added for chip breaking. It is the default choice when corrosion resistance matters and the application does not require anything more. 304 cuts more slowly. 316L adds molybdenum for better corrosion resistance and is the medical and marine standard, but it is gummy and takes longer. 17-4 PH is a precipitation hardening grade used where strength matters, and it wears tooling faster.

The spread from 303 to 316L on the same geometry is significant in both cycle time and tool cost. The stainless steel guide compares the grades in detail and covers when each one is worth it.

Titanium

Grade 5, also called Ti-6Al-4V, and Grade 23, the extra low interstitial version used for implants, are the ones you will meet. Titanium is not hard, but it holds heat in the cutting zone, springs back elastically after the tool passes and reacts with tooling at temperature.

On a Swiss machine it runs well within limits: sharp tools, modest speeds, generous coolant and careful chip control. Bar cost is high and remnant waste matters. The titanium guide covers grades, tolerances and traceability.

Aluminum

2011 is the free machining grade and behaves close to brass on the machine. 6061 is the general purpose structural choice and cuts well but produces stringier chips. 7075 is stronger and used where the part carries load.

Aluminum parts are usually cheap per part but light, so bar cost is low relative to steel. Watch thin walls, which flex more than the same section in steel, and watch any anodizing, which grows the dimension.

Copper alloys

Beryllium copper and other copper alloys appear in electrical contacts and connector pins for conductivity and spring properties. Pure copper is difficult, because it is soft and gummy and smears rather than breaking chips. Copper alloys with machining additives run much better. If the part is electrical, ask whether a brass or a copper alloy meets the conductivity requirement, because the price difference can be large.

Carbon and alloy steels

12L14 and similar free machining steels are cheap and cut quickly, and they suit non corrosive applications. 4140 and other alloy steels are used where strength matters, often heat treated afterward. If your part is heat treated after machining, state whether dimensions apply before or after, because the part will move.

Engineering plastics

PEEK, PTFE, POM and nylon run on Swiss machines for insulators, medical components and light mechanical parts. The issues are different from metal: heat softens the material rather than the tool, thin sections flex under cutting force and gauging pressure, and parts can move after machining as stress relaxes. Typical tolerances are looser, around ±0.025 mm, and finishes are different in character.

A comparison table

Material	Relative cycle time	Bar cost	Typical uses	Watch for
Brass C360	Fastest	Low to medium	Fittings, connectors, valves	Lead free grades cut slower
Aluminum 2011	Very fast	Low	Housings, light parts	Thin walls flex
Steel 12L14	Fast	Low	Non corrosive hardware	No corrosion resistance
Stainless 303	Moderate	Medium	General corrosion resistant parts	Not for welding
Stainless 316L	Slow	Medium to high	Medical, marine, fluid	Gummy, long chips
Stainless 17-4 PH	Slow	High	Strong small parts	Movement in heat treatment
Titanium Gr 5 / Gr 23	Slowest	Highest	Implants, aerospace	Heat, springback, traceability
PEEK, POM	Fast	Medium to high	Insulators, medical	Looser tolerances, stress relief

All figures are typical. Your geometry, tolerances and volume change the ranking, sometimes substantially.

Bar stock questions worth asking

1. What bar condition will you buy? Ground or drawn, and what diameter tolerance.
2. How much remnant does each bar leave on my part? It tells you how much of the material you pay for actually becomes parts.
3. Can the part run without a guide bushing? If yes, standard bar may be acceptable and the remnant shortens.
4. Is this grade and size readily available? Specialty alloys in odd diameters carry lead time, which becomes your lead time.
5. What certification comes with the bar? Mill certificates and full lot traceability cost more and take longer to source.

That last point matters most in medical and aerospace work, where the traceability chain is part of the deliverable rather than paperwork.

How to decide

Start from function, not from habit. Write down what the material must actually do: corrosion resistance in what environment, strength under what load, conductivity, biocompatibility, temperature, regulatory requirement. Then ask which is the easiest machining grade that satisfies all of it.

A surprising number of drawings specify 316L when 303 would serve, or 6061 when 2011 would serve, simply because that is what the last part used. Quoting both grades costs you nothing and the answer is sometimes worth changing the drawing for.

Where the requirement is real, accept the cost and design around it. Loosen the tolerances that do not matter, cut features that need special tools and give the shop a realistic yearly volume so it can plan bar purchasing.

Getting grades priced side by side

Send the drawing through the RFQ form and name both the grade you plan to use and any alternative you would accept. We match the part with up to three shops that run Swiss-type lathes and reply within 24 business hours, and asking for two grades on one RFQ is a normal request.

If the tolerances on your drawing are part of the material question, the guide to Swiss machining tolerances covers how grade choice changes what is achievable.

Frequently asked questions

Keep reading

• Stainless Steel on a Swiss Lathe: Choosing Between 303, 304, 316L and 17-4 PH
• Titanium Swiss Machining for Small Precision Turned Parts