BACKING PLATES (UNDERSIDE STIFFENERS)
1/4″ thick anodized aluminum backing plates
Product Numbers
- PN: MP-004 – 3X4
- PN: MP-006 – 4X4
- PN: MP-008 – 5X5
Use with our mounting plates to put on the underside of boat deck to “sandwich” your installation for more rigidity.
Select size from drop down.
| Size | Product Number |
|---|---|
| 3X4 | MP-004 |
| 4X4 | MP-006 |
| 5X5 | MP-008 |
FAQ
What is the thickness of the backing plates?
The backing plates are 1/4 inch thick.
How do I use these backing plates with my mounting system?
Place the backing plate on the underside of the boat deck and use it with a mounting plate to create a sandwich effect, which increases the rigidity of the installation.
Are the plates made of aluminum?
Yes, the plates are made of anodized aluminum.




Anthony Alsop –
Installed the 4X4 backing plate with my mounting system. The plate is sturdy and fits perfectly under the deck. It adds noticeable stability to the setup and feels solid during use.
Jacob King –
Good quality material. The anodized finish holds up well to outdoor conditions. I used it with my mounting plate and noticed less flex in the installation.
Maria King –
The 5X5 plate fits exactly where I needed it. It’s durable and provides excellent support. Easy to install and matches the mounting plate well.