The HP Assembly Tray Lock Kit 5851-7708 is a printer service part identified as a lock assembly for a paper tray. It is intended for work on the tray locking assembly rather than for everyday printing supplies.
Part 5851-7708 appears in the parts list for the HP LaserJet Enterprise MFP M633fh, reference J8J76A. This provides a specific printer context for the part and identifies the M633fh as the listed application. The catalogue description names the item as an assembly tray lock kit, making its role clear when identifying a replacement service part.
The listing does not specify the kit’s individual components or installation details.