Copper Alloy C14520-H02
Supply condition
UNS C14520
H02 = half hard
Best all-round temper for screw-machine parts that still need some bending or crimping ductility.
Values for the H02 condition
Other C14520 tempers and conditions
C14520 is listed in 7 conditions; see the grade overview at C14520.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose when maximum conductivity, bending or riveting/upsetting is required after machining. | 70 | 225 | 50 | 45 HB | 93 % IACS |
As hot rolled | Mill hot-worked bar for large diameters that will be fully machined; lowest strength but best conductivity. | 95 | 235 | 40 | 50 HB | 93 % IACS |
Eighth hard | Light draw pass for straightness and size tolerance while keeping good ductility for staking or bending. | 180 | 255 | 30 | 65 HB | 92 % IACS |
Quarter hard | Intermediate temper when both moderate strength and some cold-forming (bending, flaring) are needed. | 215 | 275 | 25 | 80 HB | 92 % IACS |
H02This page Half hard | Best all-round temper for screw-machine parts that still need some bending or crimping ductility. | 240 | 290 | 20 | 88 HB | 91 % IACS |
H04Default Full hard | Standard stocked bar temper for high-volume CNC/screw-machine electrical parts — maximum strength and best chip control. | 305 | 335 | 10 | 100 HB | 90 % IACS |
Extra hard | Small-diameter wire/bar where maximum hardness and stiffness of the finished pin or contact matters. | 340 | 365 | 7 | 110 HB | 89 % IACS |
What is C14520-H02?
C14520-H02 is C14520 supplied in the H02 condition — best all-round temper for screw-machine parts that still need some bending or crimping ductility. C14520-H02 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 290 MPa (42.1 ksi) — stronger than 52% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 117 GPa (17 Msi). C14520-H02 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,051°C (1,924 °F). H04 is the default condition FabDigit quotes; H02 is available on request or by drawing note.
Advantages
- Easy to machine — 85/100, better than 93% of copper alloy grades
- Conducts heat well — 355 W/m·K (205.1 BTU/hr·ft·°F), better than 90% of copper alloy grades
- High electrical conductivity — 91 % IACS, better than 88% of copper alloy grades
C14520-H02 properties
Typical room-temperature values for C14520-H02; 17 are specific to this condition. Other listed values are C14520 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C14520-H02 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,051°C (1,924 °F).
Mechanical13
C14520-H02 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 290 MPa (42.1 ksi) — stronger than 52% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C14520-H02 is rated for continuous service to 200°C (392 °F). It conducts heat at 355 W/m·K (205.1 BTU/hr·ft·°F), better than 90% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C14520-H02 conducts electricity at 91 % IACS, better than 88% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C14520-H02 takes about 55 MJ of energy and emits 3.8 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 30%.
Manufacturability7
C14520-H02's machinability is excellent (85/100, better than 93% of copper alloy grades); weldability good (55/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C14520-H02
Is C14520 easy to machine?
Excellent free-cutting copper — run high speeds with sharp positive-rake carbide, light feeds and flood coolant; chips break cleanly, ~80–90 % of free-cutting brass throughput.
Can C14520 be welded?
Resistance and brazing/soldering are excellent thanks to P-deoxidation; GTAW/GMAW is only fair — tellurium can cause hot cracking, so keep heat input low and avoid heavily restrained joints.
Can C14520 be formed, bent or molded?
Anneal (450–600 °C) before severe bending or upsetting; hard tempers tolerate only mild bends because Cu₂Te particles limit ductility.
What surface finishes work on C14520?
Not anodisable; bright dip, mechanically polish, or electroplate with Ni/Ag/Sn (use a nickel barrier for high-temperature contacts); protect bare surfaces with lacquer or benzotriazole against tarnish.
C14520 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 |
|---|---|---|
| Teforms Cu₂Te chip-breaking particles | 0.4 – 0.7 | 0.5 |
| Pdeoxidiser — prevents hydrogen embrittlement in brazing/annealing | 0 – 0.02 | 0.01 |
| CuCu + Ag + Te + P ≥ 99.90 % per CDA/ASTM B301 | ≥ 99.9 (balance) | — |
C14520-H02 — frequently asked
What is C14520-H02 used for?
C14520-H02 is typically used for machined electrical fittings, terminals and brazed connector components. In short: brazable free-machining copper; 90% IACS with chip control; better joining than C14510.
What is the yield strength of C14520-H02?
C14520-H02 has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 290 MPa (42.1 ksi) — stronger than 52% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C14520-H02 easy to machine?
Yes — machinability is rated excellent (85/100, better than 93% of copper alloy grades). Excellent free-cutting copper — run high speeds with sharp positive-rake carbide, light feeds and flood coolant; chips break cleanly, ~80–90 % of free-cutting brass throughput.
Can C14520-H02 be welded?
Yes — weldability is rated good (55/100). Resistance and brazing/soldering are excellent thanks to P-deoxidation; GTAW/GMAW is only fair — tellurium can cause hot cracking, so keep heat input low and avoid heavily restrained joints.
What surface finishes work on C14520-H02?
Not anodisable; bright dip, mechanically polish, or electroplate with Ni/Ag/Sn (use a nickel barrier for high-temperature contacts); protect bare surfaces with lacquer or benzotriazole against tarnish.
Can C14520-H02 be formed, bent or molded?
Anneal (450–600 °C) before severe bending or upsetting; hard tempers tolerate only mild bends because Cu₂Te particles limit ductility.
What is the maximum service temperature of C14520-H02?
C14520-H02 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C14520-H04 and C14520-O61?
H04 is the default condition — standard stocked bar temper for high-volume CNC/screw-machine electrical parts — maximum strength and best chip control. O61: choose when maximum conductivity, bending or riveting/upsetting is required after machining. Yield strength is 305 MPa in H04 versus 70 MPa in O61.
Sources
- ASTM B301/B301M Free-Cutting Copper Rod, Bar, Wire and Shapes — ASTM International (2020)
- CDA Alloy Datasheets C14500 / C14520 (Tellurium Copper) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Tellurium copper bar technical data — Wieland / Aurubis (2022)
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.