Copper Alloy CC493K
EN CC493K
CC493K (CuSn7Zn4Pb7-C, C93200) is a leaded tin-zinc cast bronze, the European counterpart of SAE 660 bearing bronze, in which a dispersed free lead phase gives self-lubrication within a tin-strengthened copper matrix.
Reference datasheet — CC493K is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the GC condition
CC493K tempers and conditions
CC493K is supplied in 4 conditions, soft to hard. GC is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sand cast | Choose for one-off or large complex housings, pump bodies and big bearing shells where section size is variable. | 135 | 260 | 18 | 65 HB | 11.5 % IACS |
Permanent-mould (chill) cast | Choose for medium/large series of small bushings and worm-gear blanks needing finer grain and better surface than sand casting. | 145 | 280 | 15 | 70 HB | 12 % IACS |
Centrifugally cast | Choose for large-diameter bushings, sleeves and worm wheel rims where a dense, porosity-free wall is required. | 150 | 300 | 15 | 75 HB | 12 % IACS |
GCDefault Continuously cast bar / tube | The standard stocked form — continuous-cast solid bar, hollow bar and tube for machined bushings and thrust washers. | 155 | 300 | 16 | 75 HB | 12 % IACS |
What is CC493K?
CC493K (CuSn7Zn4Pb7-C, C93200) is a leaded tin-zinc cast bronze, the European counterpart of SAE 660 bearing bronze, in which a dispersed free lead phase gives self-lubrication within a tin-strengthened copper matrix. Engineers choose it for plain bearings and bushings at 155 MPa yield, 300 MPa tensile, 16 % elongation and 75 HB, poured as sand (GS), chill (GM), centrifugal (GZ) and continuous (GC) castings including stock bar and tube. The 6–8 % lead makes it effectively unweldable and restricts use in lead-controlled potable-water hardware; CC495K (C93700) is the nearest alternative where higher lead and lower strength are acceptable. CC493K has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 855°C (1,571 °F). CC493K has a yield strength of 155 MPa (22.5 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 65% of copper alloy grades. Elongation at break is 16% and the elastic modulus is 97 GPa (14.1 Msi).
What is CC493K used for?
- plain bearings
- bushings
- thrust washers
- machine tool slides
- general bearing castings
Advantages
- Easy to machine — 85/100, better than 93% of copper alloy grades
Limitations
- Difficult to weld — 15/100, worse than 94% of copper alloy grades
- Limited formability — 8/100, worse than 94% of copper alloy grades
- Hard to polish — 60/100, worse than 92% of copper alloy grades
- Low stiffness — 97 GPa (14.1 Msi), worse than 88% of copper alloy grades
CC493K properties
Typical room-temperature values for CC493K-GC; bars are the position among copper alloy grades.
Physical3
CC493K has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 855°C (1,571 °F).
Mechanical14
CC493K has a yield strength of 155 MPa (22.5 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 65% of copper alloy grades. Elongation at break is 16% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
CC493K is rated for continuous service to 200°C (392 °F). It conducts heat at 58 W/m·K (33.5 BTU/hr·ft·°F), worse than 63% of copper alloy grades. Thermal expansion is 18.4 µm/m·K (10.2 µin/in·°F).
Electrical3
CC493K conducts electricity at 12 % IACS, worse than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (59/100), worse than 73% of copper alloy grades.
Sustainability4
Producing a kilogram of CC493K takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 75%.
Manufacturability8
CC493K's machinability is excellent (85/100, better than 93% of copper alloy grades); weldability poor (15/100); formability not recommended (8/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. CC493K is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CC493K
Is CC493K easy to machine?
Very free-cutting: use sharp positive-rake carbide or HSS, high speed, light feed and generous coolant; lead gives short chips and excellent bore finish — avoid smearing the lead phase with dull tools.
Can CC493K be welded?
Essentially unweldable by fusion due to 6–8 % Pb (hot cracking, lead fume); repair by brazing, soft soldering or mechanical means and use local extraction.
Can CC493K be formed, bent or molded?
Cast-only alloy — excellent sand, chill, centrifugal and continuous castability with wide freezing range; feed heavy sections well to avoid interdendritic shrinkage, no cold forming.
CC493K 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 | 6 – 8 | 7 |
| Pbfree lead phase gives emergency lubrication | 6 – 8 | 7 |
| Zn | 2 – 5 | 4 |
| Niincl. Co | ≤ 2 | 0.5 |
| Fe | ≤ 0.3 | 0.1 |
| Sb | ≤ 0.3 | 0.1 |
| P | ≤ 0.1 | 0.03 |
| S | ≤ 0.1 | 0.03 |
| Al | ≤ 0.01 | 0.01 |
| Si | ≤ 0.01 | 0.01 |
| Mn | ≤ 0.2 | 0.05 |
| Cu | ≥ 78 (balance) |
What surface finishes work on CC493K?
Machined running surfaces are normally left bare and oil-grooved; can be tin- or nickel-plated, chemically patinated or lightly polished, but lead inclusions limit mirror finish.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Copper Alloy CC493K in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CuSn7Zn4Pb7-C
- Similar grades
- C93200
How much does CC493K cost?
CC493K is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
CC493K — frequently asked
What is CC493K used for?
CC493K is typically used for plain bearings, bushings, thrust washers, machine tool slides and general bearing castings. In short: SAE 660 equivalent bronze; free-cutting bearing casting; self-lubricating lead phase.
What is the yield strength of CC493K?
CC493K has a typical yield strength of 155 MPa (22.5 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 65% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC493K easy to machine?
Yes — machinability is rated excellent (85/100, better than 93% of copper alloy grades). Very free-cutting: use sharp positive-rake carbide or HSS, high speed, light feed and generous coolant; lead gives short chips and excellent bore finish — avoid smearing the lead phase with dull tools.
Can CC493K be welded?
Not readily — weldability is rated poor (15/100). Essentially unweldable by fusion due to 6–8 % Pb (hot cracking, lead fume); repair by brazing, soft soldering or mechanical means and use local extraction.
What surface finishes work on CC493K?
Machined running surfaces are normally left bare and oil-grooved; can be tin- or nickel-plated, chemically patinated or lightly polished, but lead inclusions limit mirror finish.
Can CC493K be formed, bent or molded?
Cast-only alloy — excellent sand, chill, centrifugal and continuous castability with wide freezing range; feed heavy sections well to avoid interdendritic shrinkage, no cold forming.
What is the maximum service temperature of CC493K?
CC493K is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CC493K-GC and CC493K-GS?
GC is the default condition — the standard stocked form — continuous-cast solid bar, hollow bar and tube for machined bushings and thrust washers. GS: choose for one-off or large complex housings, pump bodies and big bearing shells where section size is variable. Yield strength is 155 MPa in GC versus 135 MPa in GS.
How much does CC493K cost?
CC493K is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 1982 — Copper and copper alloys: ingots and castings (CuSn7Zn4Pb7-C, CC493K) — CEN (2017)
- C93200 High-Leaded Tin Bronze alloy datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASTM B505/B505M — Continuous Cast Copper Alloy Castings — ASTM (2018)
- GB/T 1176 ZCuSn — SAC (2013)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.