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Flexible Cryogenic Coaxial Cable



At the elspec group, we know what requirements are placed on cryogenic cables. A hardness test/acid test for cables at very low temperatures shall be performed. It is important that this low heat is transported. With the new cryogenic coaxial cable from us, you are equipped for these extreme conditions.

Standard Copper Cable

  • Copper cables
  • Non-magnetic
  • High flexibility

Optimized Cable

  • Relative signal attenuation
  • Low heat conduction
  • Can be used in the range of 40m Kelvin
  • With a bandwidth of up to 40 GHz

The 1070551 from elspec with a SMPM connector is used as a flexible connection cable for probes in this area, e. g. For example, at STM Head mKelvin up to 4 Kelvin. The problem with this cable is the limited frequency bandwidth of 3GHz. Our solution is that we have further developed the MK5005 cable in terms of flexibility and connector adaptation.

Standard flexible Coaxial Cables for cryogenic applications

Type Diameter Plastic Metal Non-Magnetic Vacuum suitable Max Frequency Att @ 3 GHz
MMK5001 0,53 mm PFA Cu, Ag 3 GHz 9.8 dB/m
MK5005 0,52 mm FEP Cu, Ag 10 GHz 9.2 dB/m
MK5001 1,05 mm PTFE, FEP Cu, Ag 3 GHz 4.4 dB/m
STFLEX034 (in development / completion end of 2024) 0,93 mm PFA, FEP SS304, Ag x ✔ low conductivity 50 GHz 3.6 dB/m
STFLEX047 1,36 mm PTFE, FEP SS304, Cu, Ag x 50 GHz 2.4 dB/m
STFLEX047 CRYO 1,36 mm PTFE, FEP SS304, Ag x 50 GHz 3.4 dB/m

For cryo applications where a very flexible cable is required, the subminiature coaxial cable MK5005 can be used, with a frequency bandwidth of 10GHz. It consists of silver-plated strands for the inner conductor as well as the shield and FEP as an insulator with an outer diameter of 0.52mm. Due to the material used and the small diameter, it is still relatively flexible even at low temperatures. The appropriate connector is a SNAP IN connector from the SMPM series.

Talk to us about your perfect coaxial cable.

Weltall Kabel Astronaut

Cryogenic cables for applications at very low temperatures


For the cable group MK5005 there is currently only the RF Connector SMPmini in the design Right Angle Female.

We recommend the adapter order no 18175 (2.92mm female to SMPmini male) to measure the cable PLUS the VNA test cable order no21481 (Duartest150 2.92 male 2.92 male 1meter).

SMPm26: SMPmini Rigth Angle Jack

MK5005: subminiature cablefor room temperature -40°C to 85°C

MK5005CRYO: pre-aged subminiature cable for cryogenic temperature (mK) milliKelvin


Recommended Standard Products - on stock NOW -

Type Art. No. MOQ Request
MK5005 CRYO 20984 at 50meters Send request
MK5005CRYO-SMPm26-SMPm26-0150 ( -> 150 mm length) 21843 at 5 piece Send request
MK5005CRYO-SMPm26-SMPm26-0250 ( -> 250 mm length) 21056 at 5 piece Send request
MK5005CRYO-SMPm26-SMPm26-0500 ( -> 500 mm length) 22176 at 5 pieces Send request
Adapter 2.92mm female auf SMPMini Male 18175 at 5 pieces Send request
VNA Test Cable 21481 at 5 pieces Send request