HP Spring TS C4060 STS304 (JC61-08174A) is a replacement spring for the document feeder assembly identified in the parts list for the Samsung ProXpress SL-C4060FX. Its part number and assembly placement help identify it as a specific service component rather than a general-purpose spring.
The listing names the part as STS304, and the service parts list specifies one spring in the DSDF sub-open assembly. This makes it suitable for replacing the corresponding spring position when servicing that assembly. The available documentation confirms the item identity and placement, but does not specify dimensions or further mechanical characteristics.