Other Names for Mason Jars: A Complete Guide

Mason jars are also commonly called canning jars, preserving jars, fruit jars, or glass storage jars. Depending on the brand, design, and intended use, they may also be labeled Ball jars, Kerr jars, Kilner jars, or Weck jars. Although these terms are often used interchangeably, some refer to specific manufacturers or jar styles rather than every Mason jar.

“Canning jar” and “preserving jar” describe glass jars designed for home food preservation. Fruit jar is an older term associated with canning fruit, jam, and preserves. Before processing food, check that the jar is made for canning and that its rim is free of chips; decorative storage jars may not tolerate heat or pressure changes.

Ball and Kerr are well-known American canning-jar brands, so their names are sometimes used as shorthand for Mason jars. Kilner is closely associated with preserving jars in the United Kingdom, while Weck jars are recognized by their glass lids, rubber rings, and metal clips. Always match replacement lids and sealing components to the jar’s brand and opening size.

Mason jars may be described as regular-mouth or wide-mouth jars, referring to the diameter of the opening. Other descriptions include screw-top jar, clamp-top jar, bail jar, and embossed glass jar. A traditional Mason jar uses a threaded opening, while a clamp-top jar closes with a hinged wire mechanism and gasket.

Not every vintage-style glass container is a canning jar. Apothecary jars, pantry jars, biscuit jars, and embossed storage jars are generally intended for dry goods or display unless the manufacturer specifically approves them for heat processing. For more guidance on decorative glass storage, visit the 23.7 oz vintage embossed glass storage jar guide.