3D Printed Toilet Seat Bolt and Nut Set

Design preview. Rendered from the file, not a photo.

The maker says it fits: standard toilet seat. See the proof

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What it does

Tight threads stay locked in place so your toilet seat never loosens after two weeks like store-bought sets do
Includes bolt, nut, and washer all in one print, so you get every part you need without ordering separately
Print with custom wall thickness and infill so the parts fit your toilet perfectly and last for years
Washable and durable, so you can clean your bathroom without worrying about rust or corrosion damage

Your toilet seat stays solid and secure with this 3D-printed bolt and nut set. No more wiggles. No more tightening every few weeks.

The design uses a 3/8 inch by 2 inch bolt with specially tight threads so loosening becomes nearly impossible. The set prints as one complete assembly plus individual parts for easy access. Print the bolt with 2.5mm walls and triangle infill for maximum strength. If the washer sits too tall on your seat, simply scale the height down by 50 percent to fit perfectly.

Made from the US, designed by Random_Al. Thread the nut backwards first to activate the tight grip, then watch it work reliably for as long as you own your toilet.

3.7k downloads in the maker community. That is interest in the design on the site it came from, not our sales.

What it fits

The maker says it fits: standard toilet seat

That is the maker's word, not a fit we measured. Check the size below against your own.

standard toilet seatFrom the maker's own listing title, checked 2026-08-13. See the original post

Brand names here only say what this part fits. We are not connected to those companies, and they did not make or check this part.

What you get

This design prints as one piece.
Nothing else to print or buy for this to work.

What it is made of

Designs like this print well in PLA. Compare the materials.

Printed plastic is strong for its size, but it is not metal. We have not load tested this design, so we do not publish a weight rating. Keep it out of a hot car and away from open flame.