C95400, C95500, and C95800 are cast aluminum bronze alloys for bushings, bearings, wear parts, and marine components. All offer high strength and corrosion resistance, but they are not interchangeable.
The question is not which alloy is “best,” but which grade and casting condition fit the load, motion, environment, and drawing. C95400 is a common industrial choice, C95500 serves higher specified mechanical requirements, and C95800 is associated with seawater. The final choice requires more than a UNS number.
C95400 vs C95500 vs C95800 at a Glance
The table provides an initial comparison. Composition limits and mechanical requirements must be checked against the applicable specification and ordered condition.
| Alloy | Main composition difference | Typical selection focus | Important caution |
|---|---|---|---|
| C95400 aluminum bronze | Approximately 10–11.5% aluminum and 3–5% iron, with limited nickel | Heavy-duty bushings, wear parts, gears, and general industrial service | Properties change with centrifugal cast, continuous cast, or heat-treated condition |
| C95500 nickel aluminum bronze | Approximately 10–11.5% aluminum, with both nickel and iron generally in the 3–5% range | Higher specified strength, shock loading, and heavily loaded components | Higher strength does not automatically mean better bearing performance |
| C95800 nickel aluminum bronze | Approximately 8.5–9.5% aluminum, 4–5% nickel, 3.5–4.5% iron, and controlled manganese | Seawater, marine pumps, valves, shaft-related parts, and cavitation-prone service | Alloy selection alone cannot control the complete corrosion system |
Chemistry explains only part of the difference. Mechanical properties also depend on casting method, heat treatment, section size, and the purchase specification.
Which Aluminum Bronze Grade Fits Your Bushing Application?
Start with the failure risk and operating conditions rather than choosing the alloy with the highest published strength.
General Heavy-Duty Wear and Sliding Applications
C95400 is often evaluated first for industrial bronze bushings exposed to high load, wear, and intermittent shock. It balances strength, toughness, corrosion resistance, and machinability for many machinery applications.
It is not universal. Speed, lubrication, shaft hardness, surface finish, edge loading, and temperature still affect service life. A strong bushing can fail with unsuitable lubrication or mating surfaces.
Higher Mechanical Loads and Impact
C95500 contains more nickel and is considered when a drawing requires higher minimum properties or the part faces severe load and impact.
A valid C95400 vs C95500 comparison must use the same product form and condition. Comparing heat-treated C95500 with as-cast C95400 does not prove interchangeability. Toughness, elongation, counterface design, and inspection still matter.
Seawater, Pumps, and Cavitation Exposure
C95800 is a frequent candidate for marine bushings, pump and valve components, and parts exposed to flowing seawater. It is associated with resistance to saline corrosion, erosion, and cavitation.
The designation does not prevent every form of seawater damage. Water chemistry, velocity, temperature, deposits, galvanic contact, and local flow can change performance. Review the complete system rather than replacing an alloy only because C95800 is called “marine grade.”
Why the Alloy Grade Alone Is Not a Complete Purchase Specification
UNS C95400, C95500, and C95800 can be supplied under different routes and conditions. ASTM B271/B271M covers copper-base alloy centrifugal castings; ASTM B505/B505M covers continuous cast rod, bar, tube, and shapes. The same alloy can therefore have different forms and mechanical requirements.
JEDBUSHING mainly uses centrifugal casting for custom hollow blanks and finished bushings. Continuous cast bronze tube can be considered when section, length, quantity, and machining suit that route. The order should identify the standard, M02 or M07 condition, heat treatment when applicable, dimensions, machining allowance, quantity, tests, and documents.
Do not treat one online tensile-strength or hardness value as universal. Confirm whether it is a minimum or typical result and whether it applies to the ordered condition.
Send Your Drawing for Alloy and Casting Review
For a custom aluminum bronze bushing, send JEDBUSHING the drawing, quantity, specification, load and motion, lubrication, medium, temperature, and inspection requirements.
We can review the alloy, casting route, blank dimensions, machining allowance, and inspection plan before quotation. Any proposed substitution should be approved by the responsible engineer rather than made silently during sourcing.
Frequently Asked Questions
Can an existing bronze bushing be positively identified as C95400, C95500, or C95800?
Not by color, appearance, or hardness alone. Identification normally requires representative chemical analysis against the relevant UNS limits. Wear and sample location can affect other test results.
Can JEDBUSHING quote the same drawing in more than one aluminum bronze grade?
Yes, when the application permits alternatives. Each option should be reviewed for manufacturing route, ordered condition, testing, and service requirements—not price alone.
Can a centrifugal aluminum bronze casting be repaired by welding?
Do not assume repair is permitted. Check the specification, drawing, defect, repair procedure, and customer approval before accepting weld repair.
What should a buyer do when an old drawing uses a trade name instead of a UNS alloy number?
Send the original designation and complete drawing. Historical specifications, trade names, and modern UNS grades may not be exact equivalents; document and approve any cross-reference before production.