HP JC61-08069A Spring ES C3560, STS304 is a replacement spring part identified by HP’s exact part number. Its name specifies the ES spring type and the C3560 designation, helping distinguish it from other similarly named spring parts.
The listing also includes the STS304 material designation. This is a specific replacement component for service or repair where this exact part is required. The source does not provide dimensions, installation instructions, or a compatible device model, so those details are not described here.