Bronze Rods & Bars
Tin Bronze Rod — C90300
An unleaded tin bronze with good strength, pressure tightness and corrosion resistance for valve bodies, bushings and gears.
Product overview
C90300 rod is requested for unleaded bushings, gear blanks and valve parts. Casting method, size range and availability are confirmed with the company on inquiry.
C90300, sometimes referred to as “G bronze” or 88-8-0-4, is a classic unleaded tin bronze. It has a dense, fine-grained structure and is valued for pressure tightness, strength and good resistance to corrosion in fresh and salt water.
The absence of lead makes it harder to machine than leaded bronzes but more suitable where lead content or very high pressure tightness matters. It is a common choice for bushings, gears and valve components in steam and water service.
Material identification
| Item | Detail |
|---|---|
| UNS designation | C90300 |
| Material | Tin Bronze (88-8-0-4) |
| Alloy family | Tin Bronze |
| Alloy type | Cast copper-tin-zinc alloy |
| Product form | Rod / Bar |
| Availability | Listed – sizes, tolerances and stock confirmed per inquiry |
Where it is used
- Valve bodies and fittings (design dependent)
- Bushings and bearings
- Gears and worm wheels
- Pump components
- Marine hardware in compatible service
Machining and fabrication
Moderate machinability – lower than leaded bearing bronzes. Reduced lead helps where lead-limited alloys are preferred. Suitable for soldering and brazing; welding requires procedure control.
Forms and sizes
- Round rod / bar (solid)
- Hollow bar / tube blanks – subject to confirmation
- Square, hexagonal and flat bar – subject to confirmation
- Cut lengths and machined blanks – subject to confirmation
Available diameters, lengths, tolerances and tempers are not listed on this website and are confirmed per inquiry. 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) | 86.0 – 89.0 |
| Tin (Sn) | 7.5 – 9.0 |
| Zinc (Zn) | 3.0 – 5.0 |
| Lead (Pb) | 0.30 max |
| Nickel (Ni, incl. Co) | 1.0 max |
| Iron (Fe) | 0.20 max |
| Antimony (Sb) | 0.20 max |
| Phosphorus (P) | 0.05 max |
| Sulfur (S) | 0.05 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
- ASTM B505/B505M – continuous castings
Related grades
Frequently asked questions
Is C90300 lead-free?
It is a low-lead alloy (lead limited to a trace level in the specification) but is not marketed here as meeting any drinking-water standard. Lead-restricted applications should be reviewed against the applicable regulation.
How does C90300 differ from C90500?
C90500 has a higher tin range, giving a harder and somewhat stronger alloy.
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