• Free US shipping
  • Fits 14–20 mm top-access holes
  • 304 stainless steel screws & washers
  • 4 bolts fix 2 toilet seats
  • Fits with just a Phillips screwdriver
  • Tracked delivery in 8–17 days
Kit: 4 top-fix toilet seat bolts, 4 washers, 4 gasketsBolt installed on a toilet seat hinge, tightened from the topCutaway: the serrated wing grips under the bowlMeasuring the toilet seat mounting hole with a rulerBefore: seat slides side to side. After: locked in place
Kit: 4 top-fix toilet seat bolts, 4 washers, 4 gaskets

Top-Fix Toilet Seat Bolts, Expanding Anchor, 4 Bolts for 2 Seats

Fits 14–20 mm top-access holes · Measure first
$19.99$29.9933% OFFFree US shipping
4 bolts · fixes 2 toilet seatsIncludes washers and hinge gaskets
$4.99 / bolt
  • Free tracked shipping, 8–17 days to the US
  • Unsure about size? Message us with your hole measurement before ordering
  • Stops the side-to-side wobble. The anchor expands under the bowl and clamps the hinge down.
  • Fits from the top. Made for blind holes where you can't reach a nut underneath.
  • Serrated locking wing. Bites against the underside of the porcelain as you tighten.
  • 304 stainless screw and washers. Chosen for a wet room.
  • In the box: 4 bolts, stainless washers, white hinge gaskets.

Measure before you buy

These bolts suit mounting holes between 14 and 20 mm across. Take the old bolt out and measure the hole in the porcelain with a ruler.

  1. Remove the old seat bolt.
  2. Measure straight across the hole in the bowl, in millimeters.
  3. Check the hole is a top-access hole (you can't reach underneath to fit a nut).
8 mm16 mm26 mm
Fits

How it holds

Tighten the screw from above and the anchor's serrated wing opens under the bowl, pulling the hinge down tight against the porcelain.

Cutaway: the serrated wing grips under the bowl

Installation

You'll need a Phillips screwdriver.

  1. Remove

    Unscrew the old bolts and lift the seat off.

  2. Position

    Line the hinges up over the holes and push a bolt through each hinge into the bowl.

  3. Tighten

    Turn each screw clockwise until the seat is firm. Stop once it holds.

  4. Check

    Rock the seat side to side. Give a final quarter turn if it moves.

Specifications

Pack4 bolts (2 seats)
ScrewM5, 304 stainless steel
Overall length60 mm
Anchor length55 mm
Cap diameter12.5 mm
Flange diameter18.5 mm
Mounting hole14–20 mm, top access
IncludedStainless washers, white hinge gaskets
Kit: 4 top-fix toilet seat bolts, 4 washers, 4 gaskets

When these won't work

Hole outside 14–20 mm

Too small and the anchor won't go in. Too large and the wing can't grip.

Cracked or chipped hole

The anchor needs sound porcelain around the hole to clamp against.

Overtightening

Tighten until firm and stop. Forcing it can split the gasket or stress the bowl.

Questions

Will these fit my toilet?

They fit top-access mounting holes from 14 to 20 mm. Measure your hole first; the size check above will tell you.

What tools do I need?

A Phillips screwdriver.

How tight should I go?

Until the seat stops moving, then stop. A final quarter turn is usually enough if it creeps.

How many toilets does one pack fix?

Two. Each seat uses two bolts, and the pack has four.

$19.994 bolts · fixes 2 toilet seats