Copper Alloy C66200-H08
Supply condition
UNS C66200 · ASTM B591
H08 = spring hard
Pick for spring contacts and clips where the highest elastic limit in thin strip is required.
Values for the H08 condition
Other C66200 tempers and conditions
C66200 is listed in 8 conditions; see the grade overview at C66200.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for deep drawing, severe bending and forming before final work-hardening. | 140 | 360 | 48 | 85 HB | 15 % IACS |
Quarter hard | Pick when moderate forming must be combined with a useful strength increase over annealed. | 290 | 420 | 25 | 120 HB | 14 % IACS |
Half hard | General-purpose cold-rolled strip temper balancing strength and bend performance. | 385 | 485 | 12 | 142 HB | — |
HR02Default Half hard, cold rolled and stress relieved | Default stocked strip temper: half-hard strength with a stress-relief bake to raise elastic limit and resist ammonia stress-corrosion cracking. | 400 | 490 | 10 | 145 HB | 14 % IACS |
Full hard | Pick for flat springs, contacts and stampings needing high strength with only gentle forming. | 480 | 560 | 6 | 165 HB | — |
Hard, cold rolled and stress relieved | Highest routinely stocked strip temper for springy contacts; stress relief raises the elastic limit and reduces SCC sensitivity. | 500 | 570 | 5 | 172 HB | 14 % IACS |
Extra hard | Pick for flat parts requiring maximum strength with essentially no forming. | 545 | 615 | 4 | 183 HB | 14 % IACS |
H08This page Spring hard | Pick for spring contacts and clips where the highest elastic limit in thin strip is required. | 595 | 655 | 3 | 196 HB | 14 % IACS |
What is C66200-H08?
C66200-H08 is C66200 supplied in the H08 condition — pick for spring contacts and clips where the highest elastic limit in thin strip is required. C66200-H08 has a yield strength of 595 MPa (86.3 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 94% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 115 GPa (16.7 Msi). C66200-H08 has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% of copper alloy grades. It melts at 900°C (1,652 °F). HR02 is the default condition FabDigit quotes; H08 is available on request or by drawing note.
Advantages
- High strength — 595 MPa (86.3 ksi), better than 94% of copper alloy grades
Limitations
- Limited ductility — 3%, worse than 97% of copper alloy grades
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
C66200-H08 properties
Typical room-temperature values for C66200-H08; 20 are specific to this condition. Other listed values are C66200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C66200-H08 has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% of copper alloy grades. It melts at 900°C (1,652 °F).
Mechanical12
C66200-H08 has a yield strength of 595 MPa (86.3 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 94% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 115 GPa (16.7 Msi).
Thermal6
C66200-H08 is rated for continuous service to 150°C (302 °F). It conducts heat at 60 W/m·K (34.7 BTU/hr·ft·°F), worse than 59% of copper alloy grades. Thermal expansion is 19.5 µm/m·K (10.8 µin/in·°F).
Electrical3
C66200-H08 conducts electricity at 14 % IACS, worse than 56% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of C66200-H08 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 40%.
Manufacturability7
C66200-H08's machinability is fair (35/100, better than 51% of copper alloy grades); weldability fair (50/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C66200-H08
Is C66200 easy to machine?
Unleaded brass — gummy, long chips; use sharp positive-rake tools, high speed and good lubrication; roughly 30 % of AISI 1212.
Can C66200 be welded?
Resistance and brazing/soldering are preferred; fusion welding risks zinc fuming and porosity, use silicon-bronze filler with local exhaust.
Can C66200 be formed, bent or molded?
Excellent deep drawing and bending in O60/H01; in HR02/HR04 keep bend radii ≥1–2t and bend across the rolling direction.
What surface finishes work on C66200?
Polishes to a bright warm-yellow finish; readily nickel-, tin-, silver- or chrome-plated; use clear lacquer or benzotriazole passivation to prevent tarnish. Not anodizable.
C66200 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 |
|---|---|---|
| Cuvalue recalled from CDA/ASTM B591 listing — verify against current standard | 86 – 89 | 87.5 |
| Ninickel addition for strength and dezincification resistance | 1.5 – 2 | 1.8 |
| Fe | ≤ 0.05 | — |
| Pb | ≤ 0.05 | — |
| Znremainder, nominally ~10–12 % | balance | — |
C66200-H08 — frequently asked
What is C66200-H08 used for?
C66200-H08 is typically used for architectural hardware, electrical connectors and decorative trim. In short: nickel-strengthened forming brass; better corrosion than plain brass; strip and sheet grade.
What is the yield strength of C66200-H08?
C66200-H08 has a typical yield strength of 595 MPa (86.3 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 94% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C66200-H08 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of copper alloy grades). Unleaded brass — gummy, long chips; use sharp positive-rake tools, high speed and good lubrication; roughly 30 % of AISI 1212.
Can C66200-H08 be welded?
With care — weldability is rated fair (50/100). Resistance and brazing/soldering are preferred; fusion welding risks zinc fuming and porosity, use silicon-bronze filler with local exhaust.
What surface finishes work on C66200-H08?
Polishes to a bright warm-yellow finish; readily nickel-, tin-, silver- or chrome-plated; use clear lacquer or benzotriazole passivation to prevent tarnish. Not anodizable.
Can C66200-H08 be formed, bent or molded?
Excellent deep drawing and bending in O60/H01; in HR02/HR04 keep bend radii ≥1–2t and bend across the rolling direction.
What is the maximum service temperature of C66200-H08?
C66200-H08 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 C66200-HR02 and C66200-O60?
HR02 is the default condition — default stocked strip temper: half-hard strength with a stress-relief bake to raise elastic limit and resist ammonia stress-corrosion cracking. O60: pick for deep drawing, severe bending and forming before final work-hardening. Yield strength is 400 MPa in HR02 versus 140 MPa in O60.
Sources
- ASTM B591 — Copper-Zinc-Tin Alloy Plate, Sheet, Strip and Rolled Bar — ASTM International (2022)
- ASTM B601 — Temper Designations for Copper and Copper Alloys — ASTM International (2019)
- CDA UNS alloy datasheets (copper.org) — Copper Development Association (2024)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
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.