MIL-PRF-23648/19C, PERFORMANCE SPECIFICATION, RESISTOR, THERMAL (THERMISTOR), HERMETICALLY SEALED, POSITIVE TEMPERATURE COEFFICIENT, STYLE RTH42 (28 SEP 2001)., This specification covers the detail requirements for style RTH42 thermistors. This style is available in resistance ratio E only. Terminal leads type S and W are available. Resistance tolerance versus temperature characteristics G, J, and K are applicable through the maximum temperature of 125°C.