Precious Metal 18K-H02 vs 18K-O
Precious Metal · 18K temper comparison
18K-H02 and 18K-O are two conditions of the same precious metal grade, 18K: H02 (half hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. 18K-H02 is the stronger of the two: yield strength 480 MPa (69.6 ksi) against 240 MPa (34.8 ksi) for 18K-O, about 100% more; tensile strength follows at 600 MPa (87 ksi) vs 450 MPa (65.3 ksi). In exchange, 18K-O is the more ductile: elongation 38% versus 12% for 18K-H02, and 18K-H02 is harder (176 HB vs 143 HB). 18K-O runs hotter in service (300°C vs 200°C continuous). On the shop floor, 18K-H02 machines more easily (good vs fair).
18K-H02Choose it when strength drives the design, or when the part is machined in volume.
18K-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
18K-H02 vs 18K-O: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all precious metal grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all precious metal grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 80 GPa11.6 Msi · Shear Modulus 29 GPa4.2 Msi · Bulk Modulus 135 GPa19.6 Msi · Poisson's Ratio 0.4
Physical
Density and transition temperatures.
Same in both: Density 15.5 g/cm³0.56 lb/in³ · Melting Point (Solidus) 885°C1,625 °F · Liquidus Temperature 910°C1,670 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 165 J/kg·K0.04 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 15.5 µm/m·K8.6 µin/in·°F · Latent Heat of Fusion 75 J/g32.2 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) 0.2 V · Corrosion Resistance 93 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 85 / 100 · Brazeability / Solderability 95 / 100 · Polishability 98 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 190,000 MJ/kg8.17×10⁷ BTU/lb · Embodied Carbon (primary production) 15,000 kg CO₂/kg · Embodied Water 200,000 L/kg23,965 gal/lb · Typical Recycled Content 35%
Strength versus weight
Yield strength against density for every precious metal grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
18K-H02 vs 18K-O — frequently asked
Is 18K-H02 stronger than 18K-O?
Yes. 18K-H02 has a typical yield strength of 480 MPa (69.6 ksi) against 240 MPa (34.8 ksi) for 18K-O — about 100% more. Tensile strength is 600 MPa (87 ksi) vs 450 MPa (65.3 ksi).
Which condition does FabDigit quote by default, H02 or O?
O is the default 18K condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, 18K-H02 or 18K-O?
18K-H02. Its machinability rates good (60/100) against fair (50/100) for 18K-O; for welding the order is 18K-O first (very good, 82/100) then 18K-H02 (very good, 75/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 18K-H02 and 18K-O side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.