There is a Bulk package for NTC thermistors. The package Bead, Glass includes it for convenience. As a result, the resistance tolerance for NTC thermistors is ±10%. If you wish to ensure reliable performance, you should set the temperature of NTC thermistors to 260°C.
GT503J1K Features
Package/Case: Bulk GT Series Operating Temperature: 260°C Mounting Type: Through Hole
GT503J1K Applications
There are a lot of Littelfuse Inc. GT503J1K NTC Thermistors applications.