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Concealed Post Base for Square Timber Posts
Our Square Knife Plate is a heavy-duty cold rolled steel post base made to anchor square timbers to floors, decks, concrete and footings. The 10" knife fits into a slot cut in the end of the timber for a hidden connection, while the square base lines up with the edges of your post for a crisp, architectural finish.
Specifications
- Material: Cold rolled steel
- Finish: Raw steel (unfinished)
- Base plate: ½" thick square base with four ¾" mounting holes
- Knife plate: 10" tall × 4" wide × ¼" thick
- Base sizes: 6", 8" or 10" square
- Best for: Square timbers, 6x6, 8x8 and 10x10 posts
- Includes: Knife plate only. Fasteners, nuts and bolts are sold separately.
Where to Use a Timber Post Knife Plate
- Timber stair posts and newel posts
- Deck posts
- Entryway and porch posts
- Freestanding timber signs
- Timber pergolas
- Mailbox posts
- Gazebos and pavilions
- Fence and gate posts
- Arbors and garden trellises
- Outdoor lamp posts
Why Choose a Knife Plate Post Base?
A knife plate sits inside the timber instead of wrapping around it, so you get a strong steel connection with almost no visible hardware. It's the go-to choice for timber-frame, modern rustic and craftsman builds where a clean post line matters.
Frequently Asked Questions
What size square knife plate do I need?
Match the base to your timber: 6" for 6x6 posts, 8" for 8x8 posts and 10" for 10x10 posts.
How does a knife plate install?
The base is fastened to your floor or footing through the four ¾" holes. A slot is cut into the end of the timber to receive the 10" knife, and the timber is then secured to the knife.
Can I use this outdoors?
Yes, with a protective coating. Knife plates ship in a raw steel finish, which will rust if left exposed to the weather. For outdoor use, we recommend painting or powder coating before installation. Raw steel can also be left to patina for a rustic look.
Are fasteners included?
No. Each knife plate ships as the steel plate only. Choose anchors for your floor or footing (concrete, wood deck, etc.) to fit the four ¾" base holes, and bolts sized for your timber to secure it to the knife.