Copper Alloy C35300-H04
Supply condition
UNS C35300 · ASTM B121 · EN CW606N
H04 = full hard
Use where flatness, stiffness in thin gauge and higher yield strength matter more than bending.
Values for the H04 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 | — |
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 | — |
H04This page 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-H04?
C35300-H04 is C35300 supplied in the H04 condition — use where flatness, stiffness in thin gauge and higher yield strength matter more than bending. C35300-H04 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 82% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 97 GPa (14.1 Msi). C35300-H04 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; H04 is available on request or by drawing note.
Advantages
- High strength — 415 MPa (60.2 ksi), better than 82% of copper alloy grades
- Easy to machine — 72/100, better than 79% of copper alloy grades
Limitations
- Needs corrosion protection — 43/100, worse than 99% 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 88% of copper alloy grades
- Limited ductility — 8%, worse than 83% of copper alloy grades
C35300-H04 properties
Typical room-temperature values for C35300-H04; 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-H04 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-H04 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 82% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
C35300-H04 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-H04 conducts electricity at 25.5 % IACS, better than 60% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (43/100), worse than 99% of copper alloy grades.
Sustainability4
Producing a kilogram of C35300-H04 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-H04's machinability is very good (72/100, better than 79% of copper alloy grades); weldability poor (15/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C35300-H04
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-H04 — frequently asked
What is C35300-H04 used for?
C35300-H04 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-H04?
C35300-H04 has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 82% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C35300-H04 easy to machine?
Yes — machinability is rated very good (72/100, better than 79% 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-H04 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-H04?
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-H04 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-H04?
C35300-H04 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-H04?
Yes — C35300-H04 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.