Bemis 170TK Elongated Plastic Toilet Seat with Top-Tite Hinge

The 170TK is an elongated seat sized 18.625 inches long by 14.125 inches wide, with a 5.5 inch bolt spread. That bolt spread is the industry standard center-to-center spacing on two-bolt toilets, so it drops onto most manufacturers' elongated bowls. Measure your bowl from the center of the mounting holes to the front rim: an elongated bowl runs about 18-1/2 inches. If yours measures closer to 16-1/2 inches, you have a round front bowl and this seat will overhang.

Top-Tite means you tighten the seat from above the bowl instead of reaching underneath to hold a nut. For a maintenance tech swapping seats across a building, that is the difference between a two-minute job and lying on the floor behind a toilet. The hinges are plastic and color matched to the seat.

The 170TK uses resilient plastic with molded-in color, so the color runs through the material rather than sitting on the surface as a coating. That resists wear, chips, and stains from cleaning chemicals better than a painted wood seat, where a chipped edge shows bare substrate. It is the cost-effective tier, which is why property managers buy it by the case for turnovers and multi-family units.

Hardware is part of the seat. The Top-Tite hinge assembly and color-matched bumpers ship with it, so nothing else is required to hang it on a standard two-bolt bowl with 5-1/2 inch hole spacing. An installation guide is published for the 170TK 000 if you want to see the sequence before you start.

No. The 170TK uses the basic Top-Tite hinge, which is a straightforward top-tightening mount with no soft close or quick release mechanism. If you need the lid to lower on its own, or need the seat to lift off for cleaning without tools, you want a seat specified with slow close or a whisper close hinge instead.

White only. The part number to order is 170TK 000, with the 000 suffix being Bemis's white color code. Bumpers and hinges are color matched to the seat.