Copper-NickelBeryllium-freeIn production
K7
CuNi14Al3Fe1
K7 is a CuNi14Al3Fe1 alloy supplied as bars for heavily stressed airframe parts. Landing gear and helicopter flap bushings use it for its resistance to metal-to-metal wear and galling, at elevated and sub-zero temperatures.
550–640 MPaYield strength
760–780 MPaTensile strength
10 %Elongation
225–230 HBHardness HB
Specify this grade
Qualification packs are released after a short form. Export control applies.
Properties
Guaranteed values, by temper.
- Alloy family
- Copper-Nickel
- Chemistry family
- CuNiAlFe
- Lead-free
- Yes
Forms
Forms & dimensions available
Bars6 variant(s)
Dimensional ranges and tolerances on request — machining and finishing are in house.
Standards
Standards & equivalences
- 2.1504
- LN 9468
Product and process qualifications are listed above. Customer approvals are confidential and are not disclosed.
Applications
Markets & applications
Applications
- Landing gear bushings and bearings
- Cargo system bushings
- Actuating sleeves
- Control surface components
- Helicopter flap system bushings
Why this grade
Resistance to metal-to-metal wear and galling.
Works with limited or no lubrication in helicopter flap systems.
Stable performance at both elevated and sub-zero temperatures.
Non-magnetic and non-sparking on impact.
Alternatives
If this grade is not the right trade-off.
GradeChemistryYield strengthChoose it when
C97 ZeSTCuNi
Niclal 02RCuNi
Niclal 08RCuNi
Niclal 13RCuNi
Niclal 15RCuNi
Niclal 23RCuNiMn
Niclal 25RCuNi
Niclal 30ACuNiMn
Niclal 30A FeCuNiMn
Niclal 30BCuNi
Niclal 30B FeCuNiMn
Niclal 30DCuNiMn
Niclal 30RCuNi