Posted on Leave a comment

Easy Guide To Installing Commercial Mailboxes

Installing your commercial mailboxes can be a breeze with only a few simple tools, a little time, and a bit of prep work beforehand.

This guide will give you all the information you need to know in order to install your commercial mailboxes without any trouble at all.


Tool’s You’ll Need

  • Drill – half-inch drill bit capable of drilling down far enough to match your anchor bolts. About 4 ½ to 5 ½ inches should be fine.
  • Torque wrench or an impact wrench
  • Washers
  • Spirit Level
  • Socket Wrench
  • Anchor Bolts

Step One

The first step to installing commercial mailboxes is to do a little prep. Flip through some catalogs and find the best one for the job.

Next, make sure you are aware of the USPS specifications for commercial mailboxes.

Keeping these specifications in mind before you begin your installation will make the process easier and will ensure that you don’t make any big errors before you’ve even started.

Be certain that when you choose the space for your commercial mailboxes, that they are within regulations.

Step Two

Prepare the area for installation. The concrete slab being used for the mailboxes should also meet USPS specifications and should be in a place that is open and easily accessible to your customers.

You should have received a drilling template when your mailboxes arrived. Use this to measure out and then drill down into the concrete. These holes will be used for the anchor bolts to keep the mailbox held down, so make sure the holes you drill are deep enough for your specific bolts.

After drilling, clean the surface of the concrete slab so that is free of dust and rocks.

Step Three

Place the gasket sheet over your drilled holes in the concrete. This sheet will act as a barrier between your mailbox and the concrete, providing it with a bit of extra protect and stability.

Set the pedestal of your mailbox on top of the gasket. Check that it is level. If not, put a couple of washers underneath the gasket on the uneven side to balance it out.

Once level, set in your anchor bolts into the drilled holes, and use your socket wrench or impact wrench to tighten the bolts into place.

Before moving on, check again to make sure the pedestal is still level.

Step Four

Now it’s on to installing the commercial mailboxes themselves.

First, check to make certain that they arrived undamaged and that everything is correct.

Place the box on the pedestal. We recommend you have at least two people doing this job, as it can hold the box securely in place while the other person does the fastening.

Step Five

Inside the mailbox, located at the bottom lockers, are two access panels that you can pull out in order to fasten the mailbox. Place a washer onto the bolt, and then a nut. Do this for all of the top bolts, using a socket wrench to make sure they are tight.

Then, return the panels to the bottom of the lockers, and close up the mailbox.

Step Six

All that’s left now is to contact your post office and have them come down to install their arrow locks into your newly installed commercial mailboxes.

And You’re Finished

That’s all there is to it!

As an extra tip, check each of the keys that came with the units to make sure they function correctly before handing them out to your customers.

Now you and your customers can enjoy your freshly installed mailbox!

Learn More About Cluster Box Units:

What is a CBU Mailbox?

How to install a CBU Mailbox:

Leave a Reply