Special Order: SERIES M LOCKING SPRING Connector Hardware Accessory Type: Locking Spring - Spring Member Primary Product Material: Carbon Steel Operating Temperature (Max): 302 °F Operating Temperature (Max): 150 °C Operating Temperature Range: -55 – 150 °C Locking Spring - Spring Member Carbon Steel | Connector Hardware | Part Number: 201921-1 | Internal Number: 201921-1 | Alias Number: 801141 | TE Connectivity