Hidden Bolt Geocache

About: We are a supplier of neodymium, rare earth magnets. We also love to conduct experiments with our magnets and build unique projects with them! We have several engineers on staff who are always thinking of new...

This regular looking nut and bolt contains a hidden secret for Geocaching! Check out this Instructable to see what's inside...

Materials needed: Bolt and nut, glue, neodymium magnet, drill bits/drill press

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Step 1: Drill Out a Hole in the Bolt

The first step requires the bolt to be drilled out, so you can make a large enough hole to fit a log sheet.

We used a grade 5 bolt because we found it to be softer than other materials. We started with a small drill bit and carefully drilled out a hole. We used several drill bits, each getting larger and larger until we had a hole large enough to fit a rolled up Geocache log sheet.

Check out the video to see how we did it!

Step 2: Glue a Strong Magnet in the Nut

The next step is much easier...simply glue a strong neodymium magnet into the nut. Use a magnet that fits nicely inside of the nut. We ended up using a 5/8" x 1/8" thick neodymium magnet for our nut, but could've even got a bit stronger. Maybe a 5/8" x 3/16" thick neodymium magnet!

Step 3: Hide Your Cache

Here's the really fun part---find an awesome spot to hide your new geocache!

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    11 months ago

    I love this idea. It’s really clever and I think it has other nifty applications as well. Great job!