Copper Alloy C35300-M20
Finish state
UNS C35300 · ASTM B121 · EN CW606N
M20 = as hot rolled
Low-cost mill-condition plate and extruded rod for parts fully machined from solid.
Values for the M20 condition
Other C35300 tempers and conditions
C35300 is listed in 8 conditions; see the grade overview at C35300.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Choose for deep drawing, severe bending or riveting before machining. | 130 | 330 | 45 | 65 HB | — |
M20This page As hot rolled | Low-cost mill-condition plate and extruded rod for parts fully machined from solid. | 140 | 340 | 40 | 70 HB | 26.5 % IACS |
Quarter hard | Balance of moderate bending ability and higher strength for stamped-and-formed parts. | 275 | 370 | 30 | 95 HB | 26 % IACS |
H02Default Half hard | The standard stock condition: best all-round combination of machinability, strength and blanking quality. | 345 | 420 | 20 | 115 HB | — |
Full hard | Use where flatness, stiffness in thin gauge and higher yield strength matter more than bending. | 415 | 480 | 8 | 145 HB | 25.5 % IACS |
Extra hard | Thin strip for flat springs, washers and wear plates needing high yield with minimal forming. | 450 | 520 | 5 | 155 HB | 25.5 % IACS |
Spring hard | Spring-temper strip for contacts and retaining parts; forming limited to gentle radii with the grain. | 475 | 550 | 4 | 165 HB | 25.5 % IACS |
Extra spring hard | Maximum cold-worked strength in thin strip; essentially non-formable, straight blanking only. | 495 | 570 | 3 | 172 HB | 25.5 % IACS |
What is C35300-M20?
C35300-M20 is C35300 supplied in the M20 condition — low-cost mill-condition plate and extruded rod for parts fully machined from solid. C35300-M20 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 74% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 97 GPa (14.1 Msi). C35300-M20 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 888°C (1,630 °F). H02 is the default condition FabDigit quotes; M20 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 40%, better than 84% of copper alloy grades
- Forms and bends easily — 75/100, better than 82% of copper alloy grades
- Easy to machine — 65/100, better than 76% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Needs corrosion protection — 46/100, worse than 96% of copper alloy grades
- Difficult to weld — 15/100, worse than 94% of copper alloy grades
- Low stiffness — 97 GPa (14.1 Msi), worse than 88% of copper alloy grades
C35300-M20 properties
Typical room-temperature values for C35300-M20; 20 are specific to this condition. Other listed values are C35300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C35300-M20 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 888°C (1,630 °F).
Mechanical12
C35300-M20 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 74% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
C35300-M20 is rated for continuous service to 150°C (302 °F). It conducts heat at 115 W/m·K (66.4 BTU/hr·ft·°F), better than 61% of copper alloy grades. Thermal expansion is 20.3 µm/m·K (11.3 µin/in·°F).
Electrical3
C35300-M20 conducts electricity at 26.5 % IACS, better than 66% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (46/100), worse than 96% of copper alloy grades.
Sustainability4
Producing a kilogram of C35300-M20 takes about 58 MJ of energy and emits 3.6 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 45%.
Manufacturability7
C35300-M20's machinability is good (65/100, better than 76% of copper alloy grades); weldability poor (15/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C35300-M20
Is C35300 easy to machine?
Excellent free-cutting behaviour at ~70 % of C36000; use positive-rake carbide or HSS, high speed, light feed, short broken chips — collect swarf as leaded scrap.
Can C35300 be welded?
Not recommended for fusion welding (lead causes hot cracking); join by soft soldering (excellent) or silver brazing with low heat input.
Can C35300 be formed, bent or molded?
Blanks, pierces and coins well in H01–H02; anneal at 425–600 °C for severe draws and stress-relieve at 250–300 °C to avoid season cracking.
What surface finishes work on C35300?
Buffs to a bright brass lustre; commonly nickel/chrome plated, lacquered or chemically antiqued — not anodizable, and pickle to remove dezincified/lead-smeared surface before plating.
C35300 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 |
|---|---|---|
| Cuincludes any Ag | 60 – 63 | 62 |
| Pbfree-machining addition | 1.5 – 2.5 | 2 |
| Fe | ≤ 0.15 | — |
| Znremainder, nominally ~36 % | balance | — |
C35300-M20 — frequently asked
What is C35300-M20 used for?
C35300-M20 is typically used for watch parts and watch backs, clock gears and instrument plates, keys and key blanks, builders' hardware, small gears and pinions and stamped-and-machined terminals. In short: standard screw-machine brass.
What is the yield strength of C35300-M20?
C35300-M20 has a typical yield strength of 140 MPa (20.3 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 74% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C35300-M20 easy to machine?
Reasonably — machinability is rated good (65/100, better than 76% of copper alloy grades). Excellent free-cutting behaviour at ~70 % of C36000; use positive-rake carbide or HSS, high speed, light feed, short broken chips — collect swarf as leaded scrap.
Can C35300-M20 be welded?
Not readily — weldability is rated poor (15/100). Not recommended for fusion welding (lead causes hot cracking); join by soft soldering (excellent) or silver brazing with low heat input.
What surface finishes work on C35300-M20?
Buffs to a bright brass lustre; commonly nickel/chrome plated, lacquered or chemically antiqued — not anodizable, and pickle to remove dezincified/lead-smeared surface before plating.
Can C35300-M20 be formed, bent or molded?
Blanks, pierces and coins well in H01–H02; anneal at 425–600 °C for severe draws and stress-relieve at 250–300 °C to avoid season cracking.
What is the maximum service temperature of C35300-M20?
C35300-M20 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C35300-H02 and C35300-O60?
H02 is the default condition — the standard stock condition: best all-round combination of machinability, strength and blanking quality. O60: choose for deep drawing, severe bending or riveting before machining. Yield strength is 345 MPa in H02 versus 130 MPa in O60.
Can FabDigit make parts in C35300-M20?
Yes — C35300-M20 is available for CNC machining; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM B36/B36M Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2018)
- ASTM B16/B16M Free-Cutting Brass Rod, Bar and Shapes — ASTM International (2019)
- CDA Alloy Datasheet C35300 (High-Leaded Brass) — 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.