Bronze Fittings
C86300 Manganese Bronze Fittings
A very high-strength cast “manganese bronze” (technically a high-tensile brass) for heavy-load gears, bearings and slow-speed components.
Product overview
C86300 fittings are a special-purpose option where very high strength is the driver. Fitting types and sizes offered are confirmed with the company, and the corrosion environment must be assessed.
C86300 is the highest-strength grade among the commonly cast copper alloys. Its microstructure, strengthened with aluminum, manganese and iron in a copper-zinc matrix, gives very high strength and hardness with good wear resistance for slow-speed, heavily loaded applications.
It is not a tin bronze: although traded as manganese bronze, it is a copper-zinc high-tensile alloy. Its corrosion resistance, particularly in sea water and in the presence of stagnant or aggressive fluids, is more limited than aluminum or nickel-aluminum bronzes, and it is subject to dezincification in some environments.
Material identification
| Item | Detail |
|---|---|
| UNS designation | C86300 |
| Material | High-Strength Manganese Bronze |
| Alloy family | Manganese Bronze |
| Alloy type | Cast copper-zinc-aluminum-manganese-iron alloy |
| Product form | Fittings |
| Availability | Listed – sizes, tolerances and stock confirmed per inquiry |
Where it is used
- Heavy-load gears and worm gears
- Slow-speed bearings and wear plates
- Valve stems and guides (design dependent)
- Press and mining equipment components
- Large structural bronze parts
Machining and fabrication
Machinable with suitable tooling at moderate rates. Hard and strong, so tool wear is notable. Weld repair requires qualified procedures.
Forms and sizes
- Elbows (45° and 90°)
- Tees and crosses
- Couplings and reducers
- Unions, plugs and caps
- Custom fittings to drawing
Only fitting types technically appropriate to the material, application and manufacturing method are offered. Sizes, thread forms and ratings are confirmed with the company. 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) | 60.0 – 66.0 |
| Zinc (Zn) | 22.0 – 28.0 |
| Aluminum (Al) | 5.0 – 7.5 |
| Manganese (Mn) | 2.5 – 5.0 |
| Iron (Fe) | 2.0 – 4.0 |
| Nickel (Ni, incl. Co) | 1.0 max |
| Tin (Sn) | 0.20 max |
| Lead (Pb) | 0.20 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 B147/B147M – aluminum-bronze and manganese-bronze sand castings (coverage to be confirmed)
Related grades
Frequently asked questions
Is manganese bronze a true bronze?
Commercially it is called bronze but it is a high-tensile copper-zinc alloy. This site follows the industry naming.
Is C86300 suitable for sea water?
Generally not preferred – aluminum or nickel-aluminum bronzes are the usual sea-water choices. Confirm for the service in question.
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