Guides / For Shops
What It Takes to Add Lead-Free Brass to Your Shop
September 25, 2026
Potable water work is moving to lead-free brass and it is not going back. If you turn brass and you are not set up for C69300 or a bismuth grade, you are declining a category that is growing while the one you serve shrinks.
Here is what adding it actually involves, from the floor rather than from a brochure.
The two families behave differently
Do not treat lead-free brass as one thing.
Bismuth brass, the C49300 family. Bismuth is a chip breaker and solid lubricant much as lead is. An existing C360 program often runs with adjusted feeds. The material costs more and is held by fewer distributors, and residual stress from bismuth particle growth during solidification is worth knowing about on cold worked parts.
Silicon brass, C69300. A genuinely different alloy. Roughly twice the tensile strength of C360, highly dezincification resistant, and it work hardens. Published machinability near 80 against C360 at 100, which understates how different it feels.
If you are adding one capability first, bismuth is the shorter path and silicon is the one buyers ask for by name. Full comparison in leaded and lead-free brass compared and the datasheets at C69300 and bismuth brass.
What changes on the floor
Tooling. Sharp, positive rake, and keep it sharp. A worn edge that still cuts C360 acceptably will rub on silicon brass, and rubbing work hardens the surface ahead of the next pass, which is a spiral you do not want.
Feeds. Keep the tool cutting. The instinct when a material feels harder is to back off, and on a work hardening alloy that makes it worse rather than better.
Threading. The one most shops report as the surprise. Plan to prove threads out separately rather than assuming the C360 process carries over, especially on gauged sealing threads.
Chip handling. Different chip form from C360, which matters on a bar-fed machine running unattended. Worth watching a full cycle before you trust it overnight.
Segregation. If you run both leaded and lead-free, you need bar storage and swarf bins kept separate. Mixed swarf loses its resale value, and mixed bar loses your traceability, which is the thing the customer is actually paying for.
What to charge
Quote it as two lines rather than one premium.
Cycle time, roughly a fifth longer on published machinability. More on your first few jobs, and price that honestly rather than absorbing it.
Material, higher per kilo and potentially a longer lead time on an unusual diameter.
A buyer who sees one lumped uplift assumes margin and pushes back. A buyer who sees cycle time and material separately understands both, because they are the same two lines in their own cost model. See quoting brass parts.
The paperwork side
This is where shops either look competent or look like they have not done it.
Mill certificates. You pass through the mill’s certificate for the bar. Know whether your customer needs one per lot or only with the first article, because per lot forces segregation and record keeping through your whole process and that belongs in the price.
Traceability. The certificate proves the bar. What makes it meaningful to the customer is your internal trail linking that bar batch to their part lot numbers. A shop that can describe that system in one sentence wins work from shops that cannot.
What you cannot supply. You cannot certify their product to NSF/ANSI 61. Certification attaches to a finished product from a named manufacturer at a named facility. Saying that plainly is a signal you understand the standard. Claiming you can supply NSF certified parts tells an informed buyer you do not. See NSF/ANSI 61 and 372 and material certificates.
How to say it to a buyer
Buyers ask “have you shipped it”, not “can you run it”, and they ask it that way on purpose.
A weak answer: “Yes, we can run any brass alloy.”
A strong answer: “We have run C69300 in production on three part numbers, the largest a 22 mm hex body with a gauged 1/2 NPT thread. We supply the mill certificate and can do per lot traceability. We have not run bismuth brass in production, though we would quote it.”
The second answer names what you have not done. That is precisely why it is believed.
Is it worth it
Worth adding if you already turn brass on bar-fed machines, serve or want to serve plumbing, gas, instrumentation or medical fluid customers, and can afford one prove-out job that does not make money.
Not worth it if brass is occasional work, if you have no bar-fed capacity, or if your customers are entirely in dry industrial and electrical service, where C360 is legal and cheaper and will stay that way until the RoHS position changes. That one is worth watching though. See RoHS exemption 6(c).
Run lead-free brass already, or planning to? Register your shop and say so on the form. Potable water RFQs only go to shops that answer yes to that question, so it changes what you see.
Frequently asked questions
Can I run C69300 on the same program as C360?
Not well. Bismuth brasses often run on an adapted C360 program with reduced feeds, because bismuth breaks the chip much as lead does. Silicon brass is a different proposition: roughly twice the strength, it work hardens, and threading in particular behaves differently. Treat it as a new part to prove out rather than a material swap.
Why do buyers ask whether I have shipped it rather than whether I can run it?
Because nearly every shop says it can run it and considerably fewer have. The gap shows up as a padded quote, a failed first article or a delivery date that slips while the shop learns. A buyer with a potable water deadline is trying to find out which side of that line you are on, and a straight answer helps you more than a hedge.
Should I stock lead-free bar or buy per job?
Per job to start. Lead-free stock is held by fewer distributors and costs more per kilo, so tying up working capital before you have repeat demand is a real risk. Once you have a repeating customer on a fixed diameter, stocking that one size is a different calculation and usually a good one.
Is there a certification I need to machine lead-free brass?
No. You supply a compliant alloy with its mill certificate and machine to the drawing. Certification to NSF/ANSI 61 attaches to a finished product from a named manufacturer at a named facility, and that path belongs to your customer, not to you. Saying so clearly is a mark of competence, not a limitation.
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