Genuine OEM HP LaserJet Enterprise flow MFP M631 dn Toners

The M631dn has two black-toner capacity choices. HP 37X is high-yield, making it the option for longer runs between toner changes, while HP 37A covers the same black-toner role.

Toner Buzz carries genuine HP 37A and 37X toner for this printer, along with the J8J87A 110/120V fuser maintenance kit. Toner handles printing; the fuser kit is a separate maintenance part.