Potable-water brass lives or dies on lead content and documentation: 0.25 percent weighted average, third-party certified, and fines measured in tens of thousands of dollars per day for non-compliance. We machine lead-free brass fittings, valve bodies and adapters per drawing, with material certificates showing the actual lead value on every batch. We machine lead-free brass grades with the certified lead value reported on every material certificate — the documentation is part of the fitting.
| Fittings & adapters | Lead-free brass, sliding-head turned |
| Valve bodies | Lead-free brass, turned + milled |
| Nipples & extensions | Brass, sliding-head turned |
| Batch range | 1,000–50,000 pcs |
| Tolerance scheme | ±0.005 mm, DIN ISO 2768-mK |
| Documents | Lead-value certificates, dimensional report |
Potable-water rules cap the weighted average lead content of wetted surfaces at 0.25 percent, third-party certification is the accepted proof, and the importer of record carries the compliance risk. That makes the brass grade and its documentation part of the product itself: a fitting without a certified lead value is not a fitting, whatever its dimensional accuracy. Third-party certification is the accepted proof, the importer carries the risk, and buyers therefore select the brass grade and its paper trail together. A fitting without a certified lead value is not a fitting, whatever its dimensional accuracy.
We machine lead-free brass grades with the certified lead value reported on every material certificate, alongside dimensional reports on threads and sealing surfaces. Threads are gauged as standard, deburring is controlled for water-flow surfaces, and the document pack repeats identically on every call-off. Samples ship in 7 to 15 days and DDP deliveries in 5 to 8 days by air, with certification-ready documentation as the default. Certification-ready documentation is the default, and sample submission to accredited testing bodies is coordinated through the same batch record when your program requires it.
| Component (IT / EN) | Typical material | Process | Typical batch |
|---|---|---|---|
| Fittings & adapters | Lead-free brass | Sliding-head turning | 1,000–50,000 |
| Valve bodies | Lead-free brass | Turning + milling | 1,000–20,000 |
| Nipples & extensions | Brass | Sliding-head turning | 5,000–50,000 |
| Machined specials | Per drawing | Turning + milling | 500–10,000 |
Lead-free brass grades per customer drawing; third-party certification testing coordinated through our accredited partners on request.
The standard flow: drawing review and quotation within 48 hours, first samples in 7–15 days, first article inspection and approval, then series production against the approved reference. Tooling, program revisions and inspection records are kept on file so that call-offs remain consistent with the approved first article.
Engineering changes — material substitutions, tolerance updates, plating or packaging changes — are handled as controlled changes against the same records.
DIN ISO 2768-mK applies as the default tolerance scheme for unspecified dimensions. EN 10204 3.1 inspection certificates are standard for metallic parts, First Article Inspection supports the approval step, and RoHS/REACH declarations are available where required. Plating, cleanliness and packaging requirements are confirmed per drawing.
Which lead-free grades do you machine?
We machine low-lead and lead-free brass grades to your drawing, with the actual lead value reported on every material certificate rather than a typical value. Where your program requires third-party testing, we support sample submission to accredited certification bodies and machine production to the same certified grade thereafter. Certified lead values are reported as actual measured results, for example 0.1 to 0.2 percent on the grades we run.
How do you control threads and sealing surfaces?
Threads are gauged on every batch as standard, and sealing surfaces are finished to the surface roughness stated on your drawing with actual values reported. First-article documentation includes the gauge method, so your incoming inspection can repeat the same measurements without agreeing a new test plan each order. Gauge methods are agreed at first-article stage and repeated on every batch, with dimensional values reported for 100 percent of the sealing features you flag.
How do tariffs and duties work for brass parts?
Duties are handled transparently: every quotation states the tariff schedule date it was priced against, can be issued EXW/FOB for your broker, or includes an estimated duty line. Brass components currently sit in the copper-derivative tier assessed on the customs value, and schedules have moved repeatedly, so repeat orders are re-verified before confirmation — any change is re-quoted to you before shipment, never discovered at the border. Quote turnaround remains 48 hours.
What are the payment and delivery terms?
New relationships start with 50 percent on order and 50 percent before shipment, or an irrevocable letter of credit for larger values. Samples ship in 7 to 15 days, series orders deliver DDP in 5 to 8 days by air, and repeat orders are re-verified against the current duty schedule before confirmation.
Send your drawing — Sinbo Precision will review material, tolerance scheme and batch plan and return a quotation within 48 hours. Samples in 7–15 days.
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