Genuine OEM HP LaserJet Enterprise MFP M631dn Toners
The LaserJet Enterprise MFP M631dn takes standard-yield HP 37A or high-yield HP 37X black toner. The 37X gives you more pages per cartridge. Its separate maintenance kit services the fuser, the part that bonds toner to paper, rather than adding toner.
Toner Buzz carries genuine HP 37A and 37X cartridges and the J8J87A 110/120-volt fuser maintenance kit for the M631dn. Choose 37A for lighter printing or 37X for frequent use. For maintenance, select the kit only after matching its voltage to your printer.