CuSn5Zn5Pb5-C (CC491K) vs CuSn7Zn4Pb7-C (CC493K): 65% composition overlap. Moderate differences, generally not direct substitutes.
CuSn5Zn5Pb5-C (CC491K) vs CuSn7Zn4Pb7-C (CC493K)
Side-by-side chemical composition and mechanical property comparison.
Overview
CuSn5Zn5Pb5-C (CC491K)
2.1096
Classic leaded gunmetal (Rotguss Rg5) — the universal copper casting alloy for bearings and fittings. 5% Sn + 5% Zn + 5% Pb provides good machinability, moderate strength, excellent corrosion resistance in fresh and sea water, and self-lubricating properties from lead phase. Used for plain bearings under low/medium loads, valve bodies, pump housings, pipe fittings, and general marine hardware. The economic workhorse of the bronze foundry. ASTM: C83600 (SAE 40), BS: LG2.
CuSn7Zn4Pb7-C (CC493K)
2.1090
The world's most common bearing bronze (Rg7). Higher tin (7%) and lead (7%) content than Rg5 provides superior bearing properties, better wear resistance, and improved self-lubrication under boundary lubrication. Good sliding properties even for occasional dry running during acceleration. Standard material per DIN 1850/ISO 4379 for plain bearings. Used for medium-load sliding bearings, bushings, guide bushings, valve seats, and worm gear nuts in general engineering, textile machinery, and agricultural equipment. ASTM: C93200.
| CuSn5Zn5Pb5-C (CC491K) | CuSn7Zn4Pb7-C (CC493K) | |
|---|---|---|
| Material Number | 2.1096 | 2.1090 |
| Category | Copper & Brass | Copper & Brass |
| Standard | EN 1982 | EN 1982 |
Chemical composition (wt%)
| Element | CuSn5Zn5Pb5-C (CC491K) | CuSn7Zn4Pb7-C (CC493K) | Overlap |
|---|---|---|---|
| Si | ≤ 0.01% | ≤ 0.01% | OK |
| P | ≤ 0.1% | ≤ 0.1% | OK |
| Ni | ≤ 2% | ≤ 2% | OK |
| Cu | 83–87% | 81–85% | Partial |
Mechanical properties
| Property | CuSn5Zn5Pb5-C (CC491K) | CuSn7Zn4Pb7-C (CC493K) | Unit |
|---|---|---|---|
| tensile_strength | 200–250 | 230–270 | MPa |
| yield_strength | 90–110 | 110–130 | MPa |
| elongation | 6–13 | 7–14 | % |
Compatibility Assessment
CuSn5Zn5Pb5-C (CC491K) and CuSn7Zn4Pb7-C (CC493K) have moderate differences (65% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is CuSn5Zn5Pb5-C (CC491K) the same as CuSn7Zn4Pb7-C (CC493K)?
CuSn5Zn5Pb5-C (CC491K) and CuSn7Zn4Pb7-C (CC493K) have a 65% composition overlap. They are generally not directly interchangeable.
Can I replace CuSn5Zn5Pb5-C (CC491K) with CuSn7Zn4Pb7-C (CC493K)?
Generally not recommended. The compositions differ significantly (65% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between CuSn5Zn5Pb5-C (CC491K) and CuSn7Zn4Pb7-C (CC493K)?
The main differences are in the following elements: Cu, Sn, Zn, Pb. CuSn5Zn5Pb5-C (CC491K) is a Copper & Brass grade, while CuSn7Zn4Pb7-C (CC493K) is a Copper & Brass grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.