Copper Alloy C93900-M05
Finish state
UNS C93900
M05 = as plaster cast
Chosen for repeat production of small bushings and thrust washers; faster solidification refines the lead distribution.
Values for the M05 condition
Other C93900 tempers and conditions
C93900 is listed in 4 conditions; see the grade overview at C93900.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As sand cast | Pick for large or complex bearing housings and one-off shapes where continuous-cast stock sizes do not fit; slightly lower and more scattered strength. | 138 | 193 | 7 | 63 HB | 11.5 % IACS |
As centrifugally cast | Use for larger-diameter rings, sleeves and thick-wall bushings where centrifugal densification gives a sound, inclusion-free wall. | 145 | 200 | 6 | 66 HB | 11.5 % IACS |
M05This page As plaster cast | Chosen for repeat production of small bushings and thrust washers; faster solidification refines the lead distribution. | 150 | 205 | 6 | 68 HB | 11.5 % IACS |
M07Default As continuous cast | Standard stocked form: continuous-cast bar/tube with fine, dense structure and the best strength of the C93900 forms — default choice for machined bushings. | 152 | 207 | 5 | 70 HB | 11.5 % IACS |
What is C93900-M05?
C93900-M05 is C93900 supplied in the M05 condition — chosen for repeat production of small bushings and thrust washers; faster solidification refines the lead distribution. C93900-M05 has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 205 MPa (29.7 ksi) — weaker than 69% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 76 GPa (11 Msi). C93900-M05 has a density of 8.78 g/cm³ (0.317 lb/in³), heavier than 53% of copper alloy grades. It melts at 762°C (1,404 °F). M07 is the default condition FabDigit quotes; M05 is available on request or by drawing note.
Advantages
- Low embodied carbon — 2.8 kg CO₂/kg, better than 100% of copper alloy grades
- Easy to machine — 82/100, better than 90% of copper alloy grades
Limitations
- Difficult to weld — 8/100, worse than 100% of copper alloy grades
- Low stiffness — 76 GPa (11 Msi), worse than 98% of copper alloy grades
- Needs corrosion protection — 45/100, worse than 98% of copper alloy grades
- Limited formability — 5/100, worse than 98% of copper alloy grades
- Hard to polish — 55/100, worse than 97% of copper alloy grades
C93900-M05 properties
Typical room-temperature values for C93900-M05; 20 are specific to this condition. Other listed values are C93900 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C93900-M05 has a density of 8.78 g/cm³ (0.317 lb/in³), heavier than 53% of copper alloy grades. It melts at 762°C (1,404 °F).
Mechanical13
C93900-M05 has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 205 MPa (29.7 ksi) — weaker than 69% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 76 GPa (11 Msi).
Thermal6
C93900-M05 is rated for continuous service to 200°C (392 °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 µm/m·K (10 µin/in·°F).
Electrical3
C93900-M05 conducts electricity at 11.5 % IACS, worse than 65% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 98% of copper alloy grades.
Sustainability4
Producing a kilogram of C93900-M05 takes about 40 MJ of energy and emits 2.8 kg of CO₂ — less than 100% of copper alloy grades. Typical recycled content is 70%.
Manufacturability7
C93900-M05's machinability is very good (82/100, better than 90% of copper alloy grades); weldability not recommended (8/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C93900-M05
Is C93900 easy to machine?
Free-machining with short chips at high speeds; use sharp, high-rake tools and light feeds to avoid smearing the soft lead phase and closing up oil grooves.
Can C93900 be welded?
Essentially unweldable by fusion processes — lead causes severe hot cracking; joins are made by soft soldering or mechanical/press fitting.
Can C93900 be formed, bent or molded?
Casting alloy only: pours readily at 1100–1200 °C, needs good gating and moderate chilling to keep the lead finely dispersed and avoid gravity segregation in thick walls.
What surface finishes work on C93900?
Turn/bore to size and burnish or hone bores; takes tin or electroless-nickel plating with proper activation, but polishing dulls quickly because of the lead phase.
C93900 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 |
|---|---|---|
| Curemainder after specified elements | 76.5 – 79.5 | 78 |
| Sn | 5 – 7 | 6 |
| Pb | 14 – 18 | 16 |
| Zn | ≤ 1.5 | — |
| Fe | ≤ 0.4 | — |
| Sb | ≤ 0.5 | — |
| NiNi + Co | ≤ 0.8 | — |
| P | ≤ 1.5 | — |
| S | ≤ 0.08 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
C93900-M05 — frequently asked
What is C93900-M05 used for?
C93900-M05 is typically used for bushings, bearings, thrust washers and wear plates. In short: high-lead bearing bronze; excellent embeddability; cast forms only.
What is the yield strength of C93900-M05?
C93900-M05 has a typical yield strength of 150 MPa (21.8 ksi) and a tensile strength of 205 MPa (29.7 ksi) — weaker than 69% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C93900-M05 easy to machine?
Yes — machinability is rated very good (82/100, better than 90% of copper alloy grades). Free-machining with short chips at high speeds; use sharp, high-rake tools and light feeds to avoid smearing the soft lead phase and closing up oil grooves.
Can C93900-M05 be welded?
Not readily — weldability is rated not recommended (8/100). Essentially unweldable by fusion processes — lead causes severe hot cracking; joins are made by soft soldering or mechanical/press fitting.
What surface finishes work on C93900-M05?
Turn/bore to size and burnish or hone bores; takes tin or electroless-nickel plating with proper activation, but polishing dulls quickly because of the lead phase.
Can C93900-M05 be formed, bent or molded?
Casting alloy only: pours readily at 1100–1200 °C, needs good gating and moderate chilling to keep the lead finely dispersed and avoid gravity segregation in thick walls.
What is the maximum service temperature of C93900-M05?
C93900-M05 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 C93900-M07 and C93900-M01?
M07 is the default condition — standard stocked form: continuous-cast bar/tube with fine, dense structure and the best strength of the C93900 forms — default choice for machined bushings. M01: pick for large or complex bearing housings and one-off shapes where continuous-cast stock sizes do not fit; slightly lower and more scattered strength. Yield strength is 152 MPa in M07 versus 138 MPa in M01.
Sources
- ASTM B505/B505M — Continuous Cast Copper Alloy Castings — ASTM (2018)
- ASTM B271 — Centrifugal Castings of Copper Alloys — ASTM (2021)
- CDA Alloy Datasheet C93900 — Copper Development Association (copper.org) (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.