Copper-Nickel-TinBeryllium-freeIn production
Declafor
CuNi7.5Sn5Te · C72670
Declafor is a copper-nickel-tin alloy with a tellurium addition that improves machining and polishing. It is used for spring contacts, test probes, coaxial connectors and watch components made from rod or strip.
570–850 MPaYield strength
410–950 MPaTensile strength
1–30 %Elongation
13 %IACSEl. conductivity
Specify this grade
Qualification packs are released after a short form. Export control applies.
Properties
Guaranteed values, by temper.
- Alloy family
- Copper-Nickel-Tin
- Chemistry family
- CuNiSnTe
- Lead-free
- Yes
Forms
Forms & dimensions available
Rods3 variant(s)
Strips2 variant(s)
Dimensional ranges and tolerances on request — machining and finishing are in house.
Applications
Markets & applications
Applications
- Electrical spring contacts and test probes
- Coaxial connectors
- Micro-components for the watch industry
- Eyewear parts
- Machined friction parts
Why this grade
Tellurium addition for improved machinability and polishing
Can substitute for beryllium copper and titanium copper in many applications
Dimensional stability during heat treatment
Strictly non-magnetic, with good friction properties and stress relaxation resistance
Alternatives
If this grade is not the right trade-off.
GradeChemistryYield strengthChoose it when
DeclaforYou are hereCuNiSnTe850 MPaChoose it when a precision part is machined from rod and its finish matters, since Declafor is the grade of the family with a tellurium addition for machining and polishing.
HardiallCuNiSn1,250 MPaChoose it when a bearing or bushing machined from bar or hollow bar must be compliant with AMS 4596, AMS 4597 or AMS 4598. It also offers the widest choice of tempers in the family.
Hardiall EcoCuNiSn724 MPaChoose it when a bushing or bearing machined from bar needs the wear behaviour of the Hardiall range and no aerospace specification applies to the part.
Niclafor 1000CuNiSn1,100 MPaChoose it when a contact, spring or shield is stamped or formed from strip or wire and needs more strength than Niclal 725 offers, compliant with ASTM B740.
Niclal 725CuNiSn600 MPaChoose it when a connector or sensor part is bent or deep drawn from strip, and a balance of elasticity and conductivity matters more than the strength of Niclafor 1000.