Quick answer

Match the lid to the model number printed on the bottom of your Zojirushi mug or bottle, not to the color or the shape you remember. A screw-off lid and a stopper cover set are different parts that solve different problems, so confirm both the model reference and the closure style before ordering. If the model number is worn off, measure the opening or compare photos with the current listing before you buy.

Read the model number before anything else

The single most reliable identifier is the model code stamped or printed on the base of the mug body, usually in the format SM- followed by letters and numbers. That code tells you which lid family fits, because Zojirushi builds lids around specific body diameters and thread patterns rather than one universal size. A lid listed for SM-NA36/48/60WA, for example, is designed for those three body sizes in that series, and it will not necessarily thread onto a mug from a different line even if the two look similar on a shelf.

If the base is scratched or the label has peeled, check the original packaging, the product page you ordered from, or your order history. A photo of the mug next to a ruler across the opening can also help you compare against listing images. Do not guess from color alone; white, red, and gray versions of the same mug often share a lid family, but different series can share a color and still use incompatible closures.

Identify whether you need a screw-off lid or a stopper cover set

Zojirushi mugs use two broad closure designs. A screw-off lid is a one-piece closure that twists onto the mug body and is common on simpler vacuum insulated mugs. A stopper cover set is the upper assembly on mugs that use a separate stopper mechanism, and it typically covers the stopper rather than replacing the entire drinking closure. These are not interchangeable, and ordering the wrong type is the most common reason a replacement part does not solve the leak.

Look at how your mug opens. If the whole top twists off as a single cap, you likely need a screw-off lid. If there is a smaller stopper inside a hinged or removable cover, you likely need a stopper cover set, and you may also need to confirm whether the stopper itself is included. Some listings explicitly exclude the stopper set, so read the product title carefully before adding it to your cart.

Check color and finish against your mug body

Color is a fit issue only in the sense that it affects whether the replacement looks like the original, but it also helps you avoid ordering a part from a different series that happens to share a model prefix. Zojirushi lists lids in specific colors such as white, red, and gray, and those colors are tied to particular product lines. If your mug is red, a gray stopper cover set from a different series may thread on but will look mismatched and may not seal correctly if the internal geometry differs.

When a listing shows a color in parentheses or a suffix such as -RA, treat that as part of the identifier. It often indicates the finish or the specific variant the part was made for. If your mug's color is no longer available, a neutral replacement may be the only option, but confirm the model reference first so you are not trading a color mismatch for a fit problem.

Confirm what is included before you order

Replacement lid listings vary in what they ship. Some are a single lid, some are a cover set, and some explicitly exclude the stopper or other internal pieces. The product title is your best signal: a listing that says it excludes the stopper set is telling you that you need to keep your existing stopper or order it separately. If you are unsure, compare the listing photo against the parts you can see on your mug right now.

It also helps to know that these are genuine Zojirushi parts rather than generic equivalents. Generic lids may fit loosely, wear faster, or change how the mug seals, which matters most for vacuum insulated bottles where the lid is part of the insulation barrier. Ordering the correct part the first time is usually cheaper than replacing a mug that never seals properly again.

Step-by-step: order the right lid

  1. Find the model number on the mug base: Read the SM- code printed or stamped on the bottom of the body. If it is worn, check your order history or measure the opening and compare with listing photos. Checkpoint: you should have a full model reference, not just a series name.
  2. Decide whether you need a screw-off lid or a stopper cover set: Twist the top off as one piece and you need a screw-off lid. See a separate stopper inside a cover and you need a stopper cover set. Checkpoint: the two types are not interchangeable, so confirm before searching.
  3. Match the color and variant suffix: Compare the color in the listing to your mug and note any suffix such as -RA that identifies the exact variant. Checkpoint: a matching model number with the wrong variant can still look or seal differently.
  4. Read the title for exclusions: Listings that exclude the stopper set mean you keep your existing stopper or order it separately. Confirm whether the part is a single lid or a multi-piece set. Checkpoint: if the title says it excludes a component, plan for that before checkout.
  5. Test the fit before you rely on it: Thread or seat the new part on the empty mug first, check that it closes fully, then fill with water and invert over a sink to confirm no leaks. Next step: if it does not seat or seal, stop and recheck the model reference rather than forcing it.

Parts that match common Zojirushi mugs