Copper Alloy C93400-M05
Finish state
UNS C93400
M05 = as plaster cast
Medium-volume small parts needing tighter dimensions and a finer as-cast grain than sand casting.
Values for the M05 condition
Other C93400 tempers and conditions
C93400 is listed in 4 conditions; see the grade overview at C93400.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As sand cast | Choose for one-off or complex-shaped bearing housings, glands and pump parts; lowest cost tooling, slightly lower properties. | 103 | 207 | 20 | 55 HB | 12 % IACS |
M05This page As plaster cast | Medium-volume small parts needing tighter dimensions and a finer as-cast grain than sand casting. | 124 | 228 | 16 | 60 HB | 12 % IACS |
As centrifugally cast | Use for large-diameter sleeves and rings where a dense, inclusion-free wall is needed. | 128 | 234 | 16 | 62 HB | 12 % IACS |
M07Default As continuous cast | Standard stock form for bushings and thrust washers — densest structure and highest strength of the casting routes. | 138 | 241 | 15 | 65 HB | 12 % IACS |
What is C93400-M05?
C93400-M05 is C93400 supplied in the M05 condition — medium-volume small parts needing tighter dimensions and a finer as-cast grain than sand casting. C93400-M05 has a yield strength of 124 MPa (18 ksi) and a tensile strength of 228 MPa (33.1 ksi) — weaker than 78% of copper alloy grades. Elongation at break is 16% and the elastic modulus is 97 GPa (14.1 Msi). C93400-M05 has a density of 8.95 g/cm³ (0.323 lb/in³), heavier than 98% of copper alloy grades. It melts at 854°C (1,569 °F). M07 is the default condition FabDigit quotes; M05 is available on request or by drawing note.
Advantages
- Easy to machine — 88/100, better than 96% of copper alloy grades
Limitations
- Hard to polish — 55/100, worse than 97% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
- Low stiffness — 97 GPa (14.1 Msi), worse than 88% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Low strength — 124 MPa (18 ksi), worse than 78% of copper alloy grades
C93400-M05 properties
Typical room-temperature values for C93400-M05; 20 are specific to this condition. Other listed values are C93400 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C93400-M05 has a density of 8.95 g/cm³ (0.323 lb/in³), heavier than 98% of copper alloy grades. It melts at 854°C (1,569 °F).
Mechanical14
C93400-M05 has a yield strength of 124 MPa (18 ksi) and a tensile strength of 228 MPa (33.1 ksi) — weaker than 78% of copper alloy grades. Elongation at break is 16% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
C93400-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
C93400-M05 conducts electricity at 12 % IACS, worse than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 64% of copper alloy grades.
Sustainability4
Producing a kilogram of C93400-M05 takes about 50 MJ of energy and emits 3.6 kg of CO₂ — less than 89% of copper alloy grades. Typical recycled content is 75%.
Manufacturability8
C93400-M05's machinability is excellent (88/100, better than 96% of copper alloy grades); weldability poor (20/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C93400-M05
Is C93400 easy to machine?
Excellent free-cutting behaviour (~80 % of C36000); use sharp positive-rake tools, light feeds and flood coolant to avoid smearing the lead phase, chips break short.
Can C93400 be welded?
Poor fusion weldability because of the high lead content; join by soldering or low-temperature brazing, or mechanically fit sleeves rather than welding.
Can C93400 be formed, bent or molded?
Casting alloy only — very fluid with a wide freezing range; needs directional solidification, generous risering and chills to avoid tin/lead inverse segregation and micro-shrinkage; not cold formable.
What surface finishes work on C93400?
Machined or ground finishes are usual; can be tin, nickel or chrome plated after careful cleaning, and takes a satin polish, but the lead phase prevents a true mirror finish.
C93400 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 |
|---|---|---|
| Cu | 82 – 85 | 84 |
| Sn | 7 – 9 | 8 |
| Pbfree lead phase provides bearing/lubricity behaviour | 7 – 9 | 8 |
| Zn | ≤ 0.8 | — |
| NiNi + Co | ≤ 1 | — |
| Fe | ≤ 0.2 | — |
| Sb | ≤ 0.5 | — |
| S | ≤ 0.08 | — |
| Phigher P (up to ~1.5 %) permitted for continuous-cast bearing product | ≤ 0.15 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
C93400-M05 — frequently asked
What is C93400-M05 used for?
C93400-M05 is typically used for bushings, bearings and wear-resistant castings. In short: medium-leaded bearing bronze; excellent free-cutting behaviour; lower service temperature.
What is the yield strength of C93400-M05?
C93400-M05 has a typical yield strength of 124 MPa (18 ksi) and a tensile strength of 228 MPa (33.1 ksi) — weaker than 78% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C93400-M05 easy to machine?
Yes — machinability is rated excellent (88/100, better than 96% of copper alloy grades). Excellent free-cutting behaviour (~80 % of C36000); use sharp positive-rake tools, light feeds and flood coolant to avoid smearing the lead phase, chips break short.
Can C93400-M05 be welded?
Not readily — weldability is rated poor (20/100). Poor fusion weldability because of the high lead content; join by soldering or low-temperature brazing, or mechanically fit sleeves rather than welding.
What surface finishes work on C93400-M05?
Machined or ground finishes are usual; can be tin, nickel or chrome plated after careful cleaning, and takes a satin polish, but the lead phase prevents a true mirror finish.
Can C93400-M05 be formed, bent or molded?
Casting alloy only — very fluid with a wide freezing range; needs directional solidification, generous risering and chills to avoid tin/lead inverse segregation and micro-shrinkage; not cold formable.
What is the maximum service temperature of C93400-M05?
C93400-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 C93400-M07 and C93400-M01?
M07 is the default condition — standard stock form for bushings and thrust washers — densest structure and highest strength of the casting routes. M01: choose for one-off or complex-shaped bearing housings, glands and pump parts; lowest cost tooling, slightly lower properties. Yield strength is 138 MPa in M07 versus 103 MPa in M01.
Sources
- ASTM B505/B505M — Continuous Cast Copper Alloy Castings — ASTM International (2018)
- ASTM B584 — Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- Copper Alloy C93400 property sheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- GB/T 1176 (comparable ZCuSn5Pb5Zn5 / ZCuPb10Sn10 grades) (2013)
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.