Copper Alloy C35300 · temper
Copper Alloy C35300-O60
Properties of the O60 condition, compared with the other C35300 tempers.
Choose for deep drawing, severe bending or riveting before machining.
What is C35300-O60?
C35300-O60 is C35300 in the O60 temper — choose for deep drawing, severe bending or riveting before machining. C35300-O60 has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 76% of copper alloy grades. Elongation at break is 45% and the elastic modulus is 97 GPa (14.1 Msi). C35300-O60 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; O60 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 45%, better than 91% of copper alloy grades
- Forms and bends easily — 75/100, better than 80% of copper alloy grades
- Easy to machine — 60/100, better than 75% of copper alloy grades
Limitations
- Needs corrosion protection — 45/100, worse than 98% 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 89% of copper alloy grades
- Low strength — 130 MPa (18.9 ksi), worse than 76% of copper alloy grades
C35300-O60 properties
Typical room-temperature values for C35300-O60 — 10 properties are specific to this condition; the rest are grade-level values shared by every C35300 temper. Each bar shows where the value sits among the copper alloy grades in FabDigit's library — further right is higher.
Physical3
C35300-O60 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-O60 has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 76% of copper alloy grades. Elongation at break is 45% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
C35300-O60 is rated for continuous service to 200°C (392 °F). It conducts heat at 115 W/m·K (66.4 BTU/hr·ft·°F), better than 60% of copper alloy grades. Thermal expansion is 20.3 µm/m·K (11.3 µin/in·°F).
Electrical3
C35300-O60 conducts electricity at 26 % IACS, better than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 98% of copper alloy grades.
Sustainability4
Producing a kilogram of C35300-O60 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-O60's machinability is good (60/100, better than 75% of copper alloy grades); weldability poor (15/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other C35300 tempers and conditions
C35300 is also supplied in 7 other conditions. The full side-by-side table is on the C35300 overview.
- H02DefaultThe standard stock condition: best all-round combination of machinability, strength and blanking quality.345 MPa yield · 115 HB
- H04Use where flatness, stiffness in thin gauge and higher yield strength matter more than bending.415 MPa yield · 145 HB
- H01Balance of moderate bending ability and higher strength for stamped-and-formed parts.275 MPa yield · 95 HB
- O60Choose for deep drawing, severe bending or riveting before machining.130 MPa yield · 65 HB
Working with C35300-O60
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-O60 — frequently asked
What is C35300-O60 used for?
C35300-O60 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-O60?
C35300-O60 has a typical yield strength of 130 MPa (18.9 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 76% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C35300-O60 easy to machine?
Reasonably — machinability is rated good (60/100, better than 75% 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-O60 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-O60?
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-O60 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-O60?
C35300-O60 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 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-O60?
Yes — C35300-O60 is available for CNC machining with instant online pricing. 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.