The Bemis toilet seat hinge is mounted from the top and is secured from underneath. Bemis also offers a Sta-Tite toilet seat that, according to Bemis, is more secure and less likely to loosen over time.
Standard Bemis Seat
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Spray penetrating fluid on the current toilet seat retaining bolts and allow it to soak in for a few minutes. Remove the nuts from the retaining bolts with a wrench. Lift the old toilet seat straight up from the bowl and remove it. Skip this step if you are installing a new toilet that does not have a seat already attached.
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Line up the threaded ends of the Bemis toilet seat hinges into the holes at the back of the top of the toilet bowl.
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Lower the seat so that it sits flat on the top edge of the bowl and the hinge threads protrude from the underside of the bowl.
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Slide a flat washer onto one of the threaded hinge bolts and hold it in place with one hand. Slide a lock washer over the treads and hold it in place. Thread a retaining nut onto the threads finger-tight. Repeat for the remaining hinge bolts.
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Tighten the nuts with a wrench alternately on each side until they are tight.
Bemis Sta-Tite Installation
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Line up the threaded ends of the Bemis toilet seat hinges into the holes at the back of the top of the toilet bowl.
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Thread the plastic Sta-Tite nuts onto the threaded ends of both of the hinge bolts underneath the back of the bowl by hand.
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Tighten each plastic nut with a wrench until the bottom of the nut sheers off.