Installation Guide
MB1 Mailbox with 2” Round In-Ground Mailbox Post (Model 7680)
Assembly Instructions
Assembly Instructions
Thank you for purchasing this premium mailbox and post. We know you'll be satisfied with the years of service it will provide. If you have any 
questions about how to assemble or install this product, or if you need any replacement parts, please call us directly at (800) 464-7491 or 
contact us at support@architecturalmailboxes.com.
© 2018, Architectural Mailboxes, LLCRev. E
www.architecturalmailboxes.com (800) 464-7491
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Hardware (included)
To attach the mailbox to the plate:To join the two post pieces:
x 8, small washers
x 4, small hex bolts
x 4, small hex nuts
1
Phillips head screwdriver
Tools (not included)
Two open end wrenches
- or -
Tools (included)
Hex wrench
x 2, headless set screws
x 1, metal expansion joiner 
DO NOT install into ground until both post pieces are securely connected using the expansion joiner.
!
Lay post pieces and the metal expansion 
joiner on a flat surface. Then, insert the joiner 
into one post piece making sure to align the 
screw holes.
Insert the headless set screw into the hole and 
tighten with the hex wrench.Tighten the screw 
until resistance is felt. Then, tighten at least 
another rotation to ensure the joiner is locked in 
place as shown in the diagram below.
Correct Post Assembly Incorrect Post Assembly
Set screw 
completely 
recessed.
a.
b.
c.
Repeat step 1b to properly assemble the 
second post piece, making sure to 
minimize the gap between the post 
pieces. 
Expansion joiner is 
making contact with 
the post. 
Set screw is 
making contact 
with the 
expansion 
joiner.
Set screw is 
not making 
contact with the 
expansion 
joiner.
Install the assembled post into 
the ground. Pay particular 
attention to the location, 
height, and distance from the 
street.
Set screw is 
exposed.
Expansion joiner is 
not making contact 
with the post. 
31
2
x 2, hole plugs
Mount the mailbox onto the 
top bracket and secure with 
the 4 hex bolts, 8 washers, 
and 4 hex nuts. 
Lastly, insert hole plugs to fill 
the two joint holes.
x4 
x4 
hole plugs x2
3
CONTACT THE LOCAL POST OFFICE BEFORE INSTALLING THE MAILBOX TO ENSURE ITS CORRECT PLACEMENT AND HEIGHT AT THE STREET. GENERALLY, MAILBOXES ARE INSTALLED AT A HEIGHT OF 41-45 
INCHES FROM THE ROAD SURFACE TO INSIDE FLOOR OF THE MAILBOX OR POINT OF MAIL ENTRY (LOCKED DESIGNS) AND ARE SET BACK 6-8 INCHES FROM THE FRONT FACE OF CURB OR ROAD EDGE TO 
THE MAILBOX DOOR.
A concrete footing is highly 
recommended. Typical post 
depths range from 12”-18” and 
may vary based on your 
installation application. 


