Copper Alloy C42200-OS035
Temper
UNS C42200
OS035 = annealed to 0.035 mm grain size
Softest commercial strip temper — pick for deep drawing or severe forming where strength is developed later.
Values for the OS035 condition
Other C42200 tempers and conditions
C42200 is listed in 9 conditions; see the grade overview at C42200.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
OS035This page Annealed to 0.035 mm grain size | Softest commercial strip temper — pick for deep drawing or severe forming where strength is developed later. | 110 | 300 | 48 | 60 HB | 28 % IACS |
Annealed to 0.015 mm grain size | Fine-grain anneal for good formability with a smoother surface after forming (less orange peel) and slightly higher strength. | 140 | 325 | 42 | 72 HB | 28 % IACS |
Quarter hard | Choose when parts need moderate stiffness but still see bending over small radii across the grain. | 275 | 360 | 28 | 108 HB | 28 % IACS |
H02Default Half hard | Default stocked strip temper: best all-round balance of spring strength and bend formability for stamped terminals. | 359 | 414 | 12 | 130 HB | 28 % IACS |
Three-quarter hard | Intermediate spring temper when H02 lacks contact force but H04 cracks on the required bend radius. | 400 | 450 | 8 | 140 HB | 28 % IACS |
Full hard | Standard spring-contact temper: high yield strength with bends limited to generous radii, usually with grain direction. | 450 | 490 | 5 | 150 HB | 28 % IACS |
Extra hard | For flat spring elements with minimal forming — high strength, very limited transverse bending. | 495 | 538 | 3 | 162 HB | 28 % IACS |
Spring hard | Spring temper for contact fingers and clips needing high, stable contact force; stress relieve after forming. | 530 | 572 | 3 | 172 HB | 28 % IACS |
Extra spring hard | Maximum-strength strip for flat springs and thin contacts where essentially no forming is required. | 555 | 595 | 2 | 180 HB | 28 % IACS |
What is C42200-OS035?
C42200-OS035 is C42200 in the OS035 temper — softest commercial strip temper — pick for deep drawing or severe forming where strength is developed later. C42200-OS035 has a yield strength of 110 MPa (16 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 82% of copper alloy grades. Elongation at break is 48% and the elastic modulus is 110 GPa (16 Msi). C42200-OS035 has a density of 8.78 g/cm³ (0.317 lb/in³), heavier than 53% of copper alloy grades. It melts at 1,004°C (1,839 °F). H02 is the default condition FabDigit quotes; OS035 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 48%, better than 97% of copper alloy grades
- Forms and bends easily — 95/100, better than 94% of copper alloy grades
Limitations
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
- Low strength — 110 MPa (16 ksi), worse than 82% of copper alloy grades
C42200-OS035 properties
Typical room-temperature values for C42200-OS035; 13 are specific to this condition. Other listed values are C42200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C42200-OS035 has a density of 8.78 g/cm³ (0.317 lb/in³), heavier than 53% of copper alloy grades. It melts at 1,004°C (1,839 °F).
Mechanical12
C42200-OS035 has a yield strength of 110 MPa (16 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 82% of copper alloy grades. Elongation at break is 48% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
C42200-OS035 is rated for continuous service to 200°C (392 °F). It conducts heat at 113 W/m·K (65.3 BTU/hr·ft·°F), better than 60% of copper alloy grades. Thermal expansion is 18.4 µm/m·K (10.2 µin/in·°F).
Electrical3
C42200-OS035 conducts electricity at 28 % IACS, better than 69% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 69% of copper alloy grades.
Sustainability4
Producing a kilogram of C42200-OS035 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%.
Manufacturability8
C42200-OS035's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability fair (45/100); formability excellent (95/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C42200-OS035
Is C42200 easy to machine?
Gummy, non-free-cutting brass (~30 % of C36000): use sharp positive-rake tools, high speed, light feeds and good lubrication; expect long chips.
Can C42200 be welded?
Excellent soft-soldering and good brazing/resistance welding; avoid arc/gas fusion welding because of zinc fume and loss of temper.
Can C42200 be formed, bent or molded?
Anneal or H01–H02 tempers stamp and deep-draw well; in H04 and harder bend with the grain, allow generous radii, and stress relieve (≈200–260 °C) formed springs to avoid SCC and relaxation.
What surface finishes work on C42200?
Takes bright polishing and standard tin, nickel, silver or gold electroplating for contacts; not anodizable — protect bare surfaces with lacquer or tarnish inhibitor.
C42200 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 |
|---|---|---|
| CuAg may be counted as Cu | 86 – 89 | 87.5 |
| Sn | 0.8 – 1.4 | 1.1 |
| Pdeoxidizer residual | ≤ 0.35 | 0.03 |
| Pbimpurity limit | ≤ 0.05 | — |
| Feimpurity limit | ≤ 0.05 | — |
| Zn | balance | — |
C42200-OS035 — frequently asked
What is C42200-OS035 used for?
C42200-OS035 is typically used for springs, connectors and terminals. In short: most formable tin brass; spring-temper contact strip; non free-cutting alloy.
What is the yield strength of C42200-OS035?
C42200-OS035 has a typical yield strength of 110 MPa (16 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 82% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C42200-OS035 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Gummy, non-free-cutting brass (~30 % of C36000): use sharp positive-rake tools, high speed, light feeds and good lubrication; expect long chips.
Can C42200-OS035 be welded?
With care — weldability is rated fair (45/100). Excellent soft-soldering and good brazing/resistance welding; avoid arc/gas fusion welding because of zinc fume and loss of temper.
What surface finishes work on C42200-OS035?
Takes bright polishing and standard tin, nickel, silver or gold electroplating for contacts; not anodizable — protect bare surfaces with lacquer or tarnish inhibitor.
Can C42200-OS035 be formed, bent or molded?
Anneal or H01–H02 tempers stamp and deep-draw well; in H04 and harder bend with the grain, allow generous radii, and stress relieve (≈200–260 °C) formed springs to avoid SCC and relaxation.
What is the maximum service temperature of C42200-OS035?
C42200-OS035 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 C42200-H02 and C42200-OS035?
H02 is the default condition — default stocked strip temper: best all-round balance of spring strength and bend formability for stamped terminals. OS035: softest commercial strip temper — pick for deep drawing or severe forming where strength is developed later. Yield strength is 359 MPa in H02 versus 110 MPa in OS035.
Sources
- ASTM B591 — Copper-Zinc-Tin Alloy Plate, Sheet, Strip and Rolled Bar — ASTM International (2022)
- ASTM B36/B36M — Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2018)
- CDA/copper.org Alloy Database — C42200 — Copper Development Association (2024)
- ASM Handbook Vol. 2 — Properties of Copper and Copper 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.