Copper Alloy C35600-H04
Supply condition
UNS C35600
H04 = full hard
Choose for flat parts and washers needing high strength and stiffness with only gentle forming.
Values for the H04 condition
Other C35600 tempers and conditions
C35600 is listed in 7 conditions; see the grade overview at C35600.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for maximum ductility when parts are deep-formed, staked or heavily bent after blanking. | 115 | 340 | 50 | 42 HRB | 26 % IACS |
Quarter hard | Use when moderate bending is still required but annealed strip is too soft to feed and blank cleanly. | 270 | 395 | 25 | 62 HRB | — |
H02Default Half hard | The general-purpose stocked temper: balanced strength, adequate bendability and top-rated screw-machine behaviour. | 340 | 425 | 15 | 70 HRB | — |
H04This page Full hard | Choose for flat parts and washers needing high strength and stiffness with only gentle forming. | 415 | 490 | 7 | 80 HRB | — |
Extra hard | For stamped contacts and clips that must hold shape with minimal deflection; bending only with generous radii. | 450 | 540 | 5 | 84 HRB | — |
Spring hard | Spring-quality strip for leaf contacts and retaining members where elastic limit matters more than ductility. | 470 | 570 | 4 | 87 HRB | — |
Extra spring hard | Highest-strength strip temper; specify only for flat or very lightly formed spring parts, as bendability is nearly exhausted. | 490 | 595 | 3 | 89 HRB | — |
What is C35600-H04?
C35600-H04 is C35600 supplied in the H04 condition — choose for flat parts and washers needing high strength and stiffness with only gentle forming. C35600-H04 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 490 MPa (71.1 ksi) — stronger than 82% of copper alloy grades. Elongation at break is 7% and the elastic modulus is 97 GPa (14.1 Msi). C35600-H04 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 885°C (1,625 °F). H02 is the default condition FabDigit quotes; H04 is available on request or by drawing note.
Advantages
- Easy to machine — 100/100, better than 100% of copper alloy grades
- High strength — 415 MPa (60.2 ksi), better than 82% of copper alloy grades
Limitations
- Needs corrosion protection — 45/100, worse than 98% of copper alloy grades
- Limited service temperature — 170°C (338 °F), worse than 92% 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
- Limited ductility — 7%, worse than 86% of copper alloy grades
C35600-H04 properties
Typical room-temperature values for C35600-H04; 10 are specific to this condition. Other listed values are C35600 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C35600-H04 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 885°C (1,625 °F).
Mechanical12
C35600-H04 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 490 MPa (71.1 ksi) — stronger than 82% of copper alloy grades. Elongation at break is 7% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
C35600-H04 is rated for continuous service to 170°C (338 °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 20.5 µm/m·K (11.4 µin/in·°F).
Electrical3
C35600-H04 conducts electricity at 26 % IACS, better than 63% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 98% of copper alloy grades.
Sustainability4
Producing a kilogram of C35600-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 70%.
Manufacturability8
C35600-H04's machinability is excellent (100/100, better than 100% of copper alloy grades); weldability poor (20/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C35600-H04
Is C35600 easy to machine?
Benchmark free-cutting behaviour — 100% rating, high speeds with neutral-to-negative rake tooling, short chips, minimal tool wear.
Can C35600 be welded?
Not recommended for fusion welding (lead causes hot cracking); join by soft soldering (excellent) or silver brazing with care.
Can C35600 be formed, bent or molded?
Cold bend in the O60/H01 tempers along or across grain with radii ≥1t; hard tempers crack easily and hot working is prohibited by the lead phase.
What surface finishes work on C35600?
Takes bright dip, benzotriazole/lacquer, nickel-chrome or tin plating well; polish to a satin-bright finish, mirror finish limited by lead inclusions.
C35600 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 |
|---|---|---|
| Cumay include Ag | 60 – 63 | 61.5 |
| Pbfree-machining phase | 2 – 3 | 2.5 |
| Fe | ≤ 0.15 | — |
| Zn | balance | — |
C35600-H04 — frequently asked
What is C35600-H04 used for?
C35600-H04 is typically used for precision machined parts, fittings and small fasteners. In short: benchmark free-cutting brass; high-volume screw-machine grade; not fusion weldable.
What is the yield strength of C35600-H04?
C35600-H04 has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 490 MPa (71.1 ksi) — stronger than 82% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C35600-H04 easy to machine?
Yes — machinability is rated excellent (100/100, better than 100% of copper alloy grades). Benchmark free-cutting behaviour — 100% rating, high speeds with neutral-to-negative rake tooling, short chips, minimal tool wear.
Can C35600-H04 be welded?
Not readily — weldability is rated poor (20/100). Not recommended for fusion welding (lead causes hot cracking); join by soft soldering (excellent) or silver brazing with care.
What surface finishes work on C35600-H04?
Takes bright dip, benzotriazole/lacquer, nickel-chrome or tin plating well; polish to a satin-bright finish, mirror finish limited by lead inclusions.
Can C35600-H04 be formed, bent or molded?
Cold bend in the O60/H01 tempers along or across grain with radii ≥1t; hard tempers crack easily and hot working is prohibited by the lead phase.
What is the maximum service temperature of C35600-H04?
C35600-H04 is rated for continuous use to about 170°C (338 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C35600-H02 and C35600-O60?
H02 is the default condition — the general-purpose stocked temper: balanced strength, adequate bendability and top-rated screw-machine behaviour. O60: pick for maximum ductility when parts are deep-formed, staked or heavily bent after blanking. Yield strength is 340 MPa in H02 versus 115 MPa in O60.
Sources
- ASTM B36/B36M — Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2018)
- ASTM B121/B121M — Leaded Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2020)
- CDA Alloy Database — C35600 Extra-High-Leaded Brass — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- GB/T 2040 / GB/T 2059 — SAC (2017)
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.