Copper Alloy C35300 · supply condition · default condition
Copper Alloy C35300-H02
Properties of the H02 condition, compared with the other C35300 tempers.
The standard stock condition: best all-round combination of machinability, strength and blanking quality.
What is C35300-H02?
C35300-H02 is C35300 supplied in the H02 condition — the standard stock condition: best all-round combination of machinability, strength and blanking quality. C35300-H02 has a yield strength of 345 MPa (50 ksi) and a tensile strength of 420 MPa (60.9 ksi) — stronger than 73% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 97 GPa (14.1 Msi). C35300-H02 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).
Advantages
- Easy to machine — 70/100, better than 78% of copper alloy grades
Limitations
- Needs corrosion protection — 45/100, worse than 98% of copper alloy grades
- Limited service temperature — 150°C (302 °F), 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 89% of copper alloy grades
C35300-H02 properties
Typical room-temperature values for C35300-H02 — 10 properties are specific to this condition; the rest are grade-level values shared by every C35300 temper. Each bar shows where the value sits among the copper alloy grades in FabDigit's library — further right is higher.
Physical3
C35300-H02 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-H02 has a yield strength of 345 MPa (50 ksi) and a tensile strength of 420 MPa (60.9 ksi) — stronger than 73% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
C35300-H02 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 60% of copper alloy grades. Thermal expansion is 20.3 µm/m·K (11.3 µin/in·°F).
Electrical3
C35300-H02 conducts electricity at 26 % IACS, better than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 98% of copper alloy grades.
Sustainability4
Producing a kilogram of C35300-H02 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-H02's machinability is very good (70/100, better than 78% of copper alloy grades); weldability poor (15/100); formability good (55/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other C35300 tempers and conditions
C35300 is also supplied in 7 other conditions. The full side-by-side table is on the C35300 overview.
- H02DefaultThe standard stock condition: best all-round combination of machinability, strength and blanking quality.345 MPa yield · 115 HB
- H04Use where flatness, stiffness in thin gauge and higher yield strength matter more than bending.415 MPa yield · 145 HB
- H01Balance of moderate bending ability and higher strength for stamped-and-formed parts.275 MPa yield · 95 HB
- O60Choose for deep drawing, severe bending or riveting before machining.130 MPa yield · 65 HB
Working with C35300-H02
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-H02 — frequently asked
What is C35300-H02 used for?
C35300-H02 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-H02?
C35300-H02 has a typical yield strength of 345 MPa (50 ksi) and a tensile strength of 420 MPa (60.9 ksi) — stronger than 73% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C35300-H02 easy to machine?
Yes — machinability is rated very good (70/100, better than 78% 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-H02 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-H02?
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-H02 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-H02?
C35300-H02 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-H02?
Yes — C35300-H02 is available for CNC machining with instant online pricing. 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.