Those are the thermistors that come in a Bulk. It is included in Radial as a convenience. Temperatures below 125°C can be reliably used with NTC thermometers. In order to ensure reliability, NTC thermistors should operate at -55°C as low as possible. It is necessary to connect the 2 pins of the NTC thermistors in order for them to function properly.
B57164K220K52 Features
2 Pins Package/Case: Bulk 10% Tolerance
B57164K220K52 Applications
There are a lot of TDK Corporation B57164K220K52 NTC Thermistors applications.
Temperature compensation for semiconductor devices
Temperature detection for CPU and memory device
Temperature compensation for ink-viscosity (Inkjet Printer)
Temperature detection of battery cells
Temperature compensation of display contrast
Temperature compensation of display backlighting (CCFL)