Copper Alloy CC495K-GZ (Centrifugally cast)
Finish state
EN CC495K · UNS C93700 · GB ZCuPb10Sn10
Pick for large-diameter bushings, sleeves and bearing rings where a dense, porosity-free wall is required.
Values for the GZ condition
Other CC495K tempers and conditions
CC495K is listed in 4 conditions; see the grade overview at CC495K.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sand cast | Pick for large, complex or one-off bearing housings and pump bodies where dimensional tolerance and top strength are secondary. | 100 | 220 | 12 | 65 HB | 10 % IACS |
Permanent (chill) mould cast | Pick for medium-volume bushings needing tighter tolerances and a finer, denser structure than sand casting. | 125 | 250 | 8 | 70 HB | 10 % IACS |
GZThis page Centrifugally cast | Pick for large-diameter bushings, sleeves and bearing rings where a dense, porosity-free wall is required. | 130 | 260 | 10 | 72 HB | 10 % IACS |
GCDefault Continuously cast bar / tube | Default stock form: continuous-cast round bar and tube for machined bushings, thrust washers and wear strips. | 140 | 270 | 10 | 75 HB | 10 % IACS |
What is CC495K-GZ?
CC495K-GZ is CC495K supplied in the GZ condition — pick for large-diameter bushings, sleeves and bearing rings where a dense, porosity-free wall is required. CC495K-GZ has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 260 MPa (37.7 ksi) — weaker than 77% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 76 GPa (11 Msi). CC495K-GZ has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 762°C (1,404 °F). GC is the default condition FabDigit quotes; GZ is available on request or by drawing note.
Advantages
- Easy to machine — 85/100, better than 93% of copper alloy grades
Limitations
- Low stiffness — 76 GPa (11 Msi), worse than 98% of copper alloy grades
- Difficult to weld — 10/100, worse than 98% of copper alloy grades
- Hard to polish — 60/100, worse than 92% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
- Low strength — 130 MPa (18.9 ksi), worse than 77% of copper alloy grades
CC495K-GZ properties
Typical room-temperature values for CC495K-GZ; 20 are specific to this condition. Other listed values are CC495K reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CC495K-GZ has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 762°C (1,404 °F).
Mechanical14
CC495K-GZ has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 260 MPa (37.7 ksi) — weaker than 77% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 76 GPa (11 Msi).
Thermal6
CC495K-GZ is rated for continuous service to 250°C (482 °F). It conducts heat at 47 W/m·K (27.2 BTU/hr·ft·°F), worse than 69% of copper alloy grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
CC495K-GZ conducts electricity at 10 % IACS, worse than 74% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (56/100), worse than 81% of copper alloy grades.
Sustainability4
Producing a kilogram of CC495K-GZ takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 70%.
Manufacturability7
CC495K-GZ's machinability is excellent (85/100, better than 93% of copper alloy grades); weldability not recommended (10/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC495K-GZ
Is CC495K easy to machine?
Excellent free-machining behaviour (≈80 % of free-cutting brass): use sharp positive-rake tools, high speed, light feed and flood coolant; chips break short thanks to the lead phase.
Can CC495K be welded?
Effectively unweldable by fusion because of 10 % lead (hot cracking, lead fume); repair by soft soldering or mechanical means, and use fume extraction on any hot work.
Can CC495K be formed, bent or molded?
Cast-only alloy with excellent fluidity and feeding — sand, chill, centrifugal and continuous casting all standard; avoid cold forming, and control cooling to prevent lead segregation in thick sections.
What surface finishes work on CC495K?
Takes a fine turned or bored bearing surface directly; polishing is limited by lead smear, and tin/lead or electroless-nickel plating is possible with careful pre-cleaning (no anodizing).
CC495K chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Sn | 9 – 11 | 10 |
| Pbfree lead phase — bearing/lubricity constituent | 8 – 11 | 10 |
| ZnC93700 limits Zn to 0.8 max | ≤ 2 | 0.5 |
| Niincl. Co | ≤ 2 | — |
| FeC93700 allows up to 0.7 | ≤ 0.25 | — |
| Sb | ≤ 0.5 | — |
| P | ≤ 0.1 | — |
| S | ≤ 0.1 | — |
| Mn | ≤ 0.2 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| Cu | ≥ 78 (balance) | — |
CC495K-GZ — frequently asked
What is CC495K-GZ used for?
CC495K-GZ is typically used for plain bearings, bushings, thrust washers, gear shift components and medium-duty bearing castings. In short: classic 10-10 bearing bronze; good load with self-lubrication; machines near free-cutting brass.
What is the yield strength of CC495K-GZ?
CC495K-GZ has a typical yield strength of 130 MPa (18.9 ksi) and a tensile strength of 260 MPa (37.7 ksi) — weaker than 77% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC495K-GZ easy to machine?
Yes — machinability is rated excellent (85/100, better than 93% of copper alloy grades). Excellent free-machining behaviour (≈80 % of free-cutting brass): use sharp positive-rake tools, high speed, light feed and flood coolant; chips break short thanks to the lead phase.
Can CC495K-GZ be welded?
Not readily — weldability is rated not recommended (10/100). Effectively unweldable by fusion because of 10 % lead (hot cracking, lead fume); repair by soft soldering or mechanical means, and use fume extraction on any hot work.
What surface finishes work on CC495K-GZ?
Takes a fine turned or bored bearing surface directly; polishing is limited by lead smear, and tin/lead or electroless-nickel plating is possible with careful pre-cleaning (no anodizing).
Can CC495K-GZ be formed, bent or molded?
Cast-only alloy with excellent fluidity and feeding — sand, chill, centrifugal and continuous casting all standard; avoid cold forming, and control cooling to prevent lead segregation in thick sections.
What is the maximum service temperature of CC495K-GZ?
CC495K-GZ is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CC495K-GC and CC495K-GS?
GC is the default condition — default stock form: continuous-cast round bar and tube for machined bushings, thrust washers and wear strips. GS: pick for large, complex or one-off bearing housings and pump bodies where dimensional tolerance and top strength are secondary. Yield strength is 140 MPa in GC versus 100 MPa in GS.
Sources
- EN 1982 — Copper and copper alloys: ingots and castings (CuSn10Pb10-C, CC495K) — CEN (2017)
- ASTM B505/B505M — Continuous cast copper alloys (C93700) — ASTM (2018)
- ASTM B584 — Copper alloy sand castings for general applications — ASTM (2022)
- GB/T 1176 — (ZCuPb10Sn10) — SAC (2013)
- CDA alloy datasheet C93700 (high-leaded tin bronze, SAE 64) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.