K7
A wrought copper-nickel-aluminium bronze for high-strength, high-reliability aerospace applications, strictly non-magnetic, with outstanding wear, galling and sea-water corrosion resistance, easily machined, and lead- and beryllium-free.
✓ Lead-free · Beryllium-free · REACH / RoHSVery high strength
Very high mechanical properties with good impact and fatigue resistance.
Wear & galling resistant
Outstanding metal-to-metal wear and galling resistance, minimal lubrication.
Non-magnetic & corrosion-resistant
Strictly non-magnetic; excellent sea-water corrosion, erosion and oxidation resistance.
Easily machined
Machines readily into complex components.
Fully integrated supply
Cast to finished part in-house, full traceability.
Copper-Nickel Alloys.
K7 (CuNi14Al3Fe1, Werkstoff 2.1504) is a wrought copper-nickel-aluminium bronze designed for high-strength, high-reliability applications. It combines very high mechanical properties with good impact and fatigue resistance, outstanding metal-to-metal wear and galling resistance, and is strictly non-magnetic.
With very good resistance to sea-water corrosion, erosion and oxidation, and easy machinability, K7 is widely used across aerospace, landing gear, airframe and control-surface components, as well as marine and oil & gas applications. It is lead- and beryllium-free and REACH / RoHS compliant.
Minimum guaranteed properties.
| Grade / spec | Form | Tensile (ksi) | Yield 0.2% (ksi) | Elong. (%) | Hardness (HB) | Hardness (HRC) | Compliant with |
|---|---|---|---|---|---|---|---|
| As supplied | Bars | 110 ksi | 79 ksi | 10 | 225 | 20 | 2.1504, LN 9468 |
Data for information only, non-contractual. Request a certified datasheet for design allowables.
Physical properties
| Density | 8.5 g/cm³ |
| Electrical conductivity | 10 %IACS |
| Thermal conductivity | 71 W/m·K |
| Young's modulus | 145 GPa |
| Thermal expansion | 16 ×10⁻⁶/K |
| Magnetic permeability | 1.01 |
| Machinability index | 10 |
| NACE corrosion rating | 5 |
Norms & designations.
Aerospace
- WL 2.1504
- LN 9468
Designations
- CuNi14Al3Fe1
- Werkstoff 2.1504
Forms & applications.
Bars & rods
Round bar up to Ø 80 mm / 3.15″, standard form for landing-gear bushings, bearings and machined components.
Landing gear & airframe
Heavily-stressed airframe components, landing-gear bushings and bearings, control surfaces and actuating sleeves.
Systems & cargo
Cargo-system bushings, plane doors, helicopter flap systems and electromechanical components.
Marine fittings
Sea-water-corrosion-resistant, non-magnetic parts for marine and naval service.