4 K Cryocoolers — SHI 1.5 W at 4.2 K

These Sumitomo RDK-415D systems provide 1.5 W of cooling at a temperature of 4.2 K at the second stage and can reach a minimum temperature of 3 K (with no parasitic or experimental heat loads). Compact water- or air-cooled compressors and 20 m long flexible gas lines complete the refrigerator package. (Please see our compressors page for more information.) Designs incorporating both refrigerator and cryostat are available for a variety of applications.

Standard configuration


  • Larger capacity of 1.5 W at 4.2 K
  • Orientation independent
  • Push-button operation

Download the RDK-415D drawing and typical load map (224 KB).

Lake Shore — environment by JANIS

RDK-415D 4 K CCR

Cold Head Model RDK-415D Specifications

Refrigeration cycleModified Gifford-McMahon
Refrigeration capacity
(Vertical Position)
50 Hz1st stage: 35 W at 50 K; 2nd stage: 1.5 W at 4.2 K
60 Hz1st stage: 45 W at 50 K; 2nd stage: 1.5 W at 4.2 K
OrientationAny — cooling capacity loss: maximum 15%
WeightApproximately 18.5 kg
Dimension180 D × 294 L × 557 H (mm)
Maintenance interval10,000 h
Flexline length20 m*
Flexline weight7.5 kg per line
Compatible compressor unit modelCSA-71A, F-70L, F-70H
* Buffer tanks + 6 m flexlines may optionally be substituted for the 20 m long lines. 6 m flexlines weigh 5 kg per line.

Specifications subject to change without notice.