What is the warranty period of yours household coffee grinder conical burrs ?

SUS420J2 coffee grinder burr mainly depends on the usage scenario (home/commercial), grind size and maintenance level, with the following general references:

• Home use (10-30g ground daily, mostly medium-coarse grind, regular cleaning): 800-1200kg of beans can be ground in total, with a normal service life of 2-3 years.

• Light commercial / high-frequency home use (50-200g ground daily, including fine grind, standard maintenance): 300-500kg of beans can be ground in total, with a service life of 1-2 years.

• Rough use / no maintenance (frequent fine grinding, no burr cleaning, grinding hard beans/foreign objects): The grinding capacity will drop sharply to less than 100kg, and the burrs are prone to chipping and blunting.

SUS420J2 is a martensitic stainless steel with moderate hardness (HRC 50-55 after quenching). Abrasion during grinding is mainly caused by the wood fiber and a small amount of minerals in coffee beans. Fine grinding (e.g., for espresso) causes more intense burr friction, with a wear rate 2-3 times higher than that of medium-coarse grinding (e.g., for pour-over coffee).