Bemis 400TTA Round Enameled Wood Toilet Seat with Top-Tite Hinge

Round only. The 400TTA is a round-front seat measuring 17.063 inches long by 14.5 inches wide, so it will come up short on an elongated bowl, which typically runs about 18-1/2 inches from the bolt holes to the front rim. If the bowl you are replacing on measures roughly 16-1/2 inches, this is the right shape; if it measures around 18-1/2, you need an elongated seat instead.

The mounting is the industry standard 5.5 inch bolt spread, center to center between the two seat post holes at the back of the bowl. Nearly every round-front toilet made in North America uses that spacing, which is why the seat fits most manufacturers' round bowls rather than being tied to one brand. Measure between the centers of your two bolt holes; if it is 5-1/2 inches, this seat lands on it.

The Top-Tite hinge on the 400TTA tightens from above the bowl, so a maintenance tech can snug a loose seat with a screwdriver from a standing position instead of reaching up under the china rim with a wrench. On a portfolio of units or a public restroom, that is the difference between a two minute callback and a ten minute one. Seats loosen from ordinary use, so a top-tightening hinge is the reason a lot of property managers standardize on this style.

Plastic. The hinge material on the 400TTA is plastic, color matched to the white seat along with the bumpers. Plastic hinges will not corrode or stain from cleaning chemicals the way plated metal can, but if your spec calls for metal hinge posts on a commercial installation, this is not that seat.

Enameled wood, like the 400TTA, is a molded wood core with a high gloss enamel shell. It sits heavier and more solid under an adult than a hollow plastic seat, and it holds a gloss that matches vitreous china closely. The tradeoff is the shell: chip the enamel or let water sit in a crack and the wood core can swell, so wood seats are the usual pick for residential and light commercial, while solid plastic gets specified where the seat takes abuse or aggressive disinfectants.

About 1.75 inches at the seat, which is the stack of the closed seat and cover on the bowl rim. That matters in two places: an ADA or comfort height install where you are working to a target rim height, and any spot where the tank lid or a wall mounted flushometer sits close behind the seat and needs clearance for the cover to swing back.

Yes, the 400TTA is made in the USA, with the country of origin listed as US. Buyers working under Buy American or domestic preference procurement rules on government, school, and public housing jobs ask for that specifically, and it is one of the reasons this seat shows up on those spec sheets.

White, model number 400TTA 000. The 000 suffix is Bemis's white color code, and the bumpers and hinges are color matched to it, so on a standard white china bowl there is no off-tone hardware breaking up the look. If you are standardizing across a building of white fixtures, one part number covers every round bowl.

The 400TTA installs with the hinge posts and hardware that ship with it, and Bemis publishes an installation guide and a spec sheet for the seat if you want the sequence and the dimensioned drawing before you order. The only thing worth checking on the bowl first is the 5.5 inch bolt spread and the round shape, since those decide fit; nothing else is required to complete a standard swap.