Bronze Flanges
C84400 Bronze Flanges
An economical, highly machinable cast alloy (about 81-3-7-9) for general-purpose fittings, valves and plumbing hardware.
Product overview
C84400 flanges are limited to general-purpose services. Pressure class, drilling and facing are confirmed with the company by drawing or standard.
C84400 is a leaded semi-red brass with higher lead and zinc and lower tin than C83600. It is easy to cast and machine and is widely used for low-pressure valves, fittings and general plumbing components where economy and machining speed matter.
It is sold under the “bronze” banner in the fittings trade. Its higher lead content means it is not for potable-water use under lead restrictions, and its strength and pressure performance are generally a step below the higher-tin alloys such as C83600 and C92200.
Material identification
| Item | Detail |
|---|---|
| UNS designation | C84400 |
| Material | Leaded Semi-Red Brass / Valve Metal (81-3-7-9) |
| Alloy family | Additional Cast Bronze Grades |
| Alloy type | Cast copper-tin-lead-zinc alloy |
| Product form | Flanges |
| Availability | Listed – sizes, tolerances and stock confirmed per inquiry |
Where it is used
- Low-pressure valves and fittings
- Plumbing and heating components
- General hardware castings
- Fixtures and instrumentation parts
Machining and fabrication
Very good machinability and casting behaviour, which keeps component cost low. Soldering and brazing are routine.
Forms and sizes
- Cast or machined flanges to drawing or standard – subject to confirmation
- Blind, slip-on, threaded and similar types – subject to confirmation
- Special-order flanges from wrought stock (e.g. C51000)
Standards, sizes, facings and ratings are confirmed with the company for each inquiry; none are published here. Do not rely on this page for dimensions, tolerances or stock.
What to include in your inquiry
- UNS grade and governing specification
- Dimensions (or drawing) and tolerance class
- Quantity and delivery timing
- Application and operating environment
- Certificate / inspection requirements
Composition reference
| Element | Nominal limit, wt % |
|---|---|
| Copper (Cu) | 78.0 – 82.0 |
| Tin (Sn) | 2.3 – 3.5 |
| Lead (Pb) | 6.0 – 8.0 |
| Zinc (Zn) | 7.0 – 10.0 |
| Nickel (Ni, incl. Co) | 1.0 max |
| Iron (Fe) | 0.40 max |
| Antimony (Sb) | 0.25 max |
| Phosphorus (P) | 0.02 max |
| Sulfur (S) | 0.08 max |
Reference data only – typical or nominal values from published specifications, not a guarantee of supplied material. Confirm against the current edition of the applicable specification, the product form and condition, and the material test certificate. Technical review by the company is required before publication or reliance.
Commonly referenced specifications
- ASTM B584 – sand castings
Related grades
Frequently asked questions
How is C84400 different from C83600?
C84400 has more lead and zinc and less tin, trading some strength and pressure tightness for economy and machining speed.
Is C84400 suitable for steam?
Not as a first choice. C92200 is the usual bronze for steam and higher-duty valve service.
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