Flat Stakes / “C” Mouth Stakes

Flat Stakes / C-mouth Stakes are driven stakes with a flat section that sits against form boards. The flat face distributes pressure and resists board rotation during concrete placement.

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At a glance

Flat Stakes / “C” Mouth Stakes at a glance.

Definition

A flat-section form stake

A driven flat-section stake for temporary concrete formwork.

Application

Flat bearing surface

The flat section sits against the form board while the point enters the ground.

Product form

Section, length and finish

Flat section 1-1/2 x 3/8 inch; lengths from 12 to 56 inches; pointed or spade end; plain or coated finish.

Also known as

Also called flat nail stake in the US. Spanish-speaking crews call it estacas planas.

US English: flat nail stakeflat steel stake
Español (US): estacas planas

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How it works

Flat side against the board

Align the flat face to the form board and drive the pointed end into the ground. The flat section distributes load and prevents board rotation.

Round Stakes
Choose round stakes for general board holding: the circular section drives cleanly beside wood or plywood boards.
Flat Stakes / “C” Mouth Stakes This page
Choose flat stakes when you want a flat bearing surface against the board and good ground resistance to turning.
Square Stakes
Choose square stakes when you want four flat sides to set squarely against formwork boards.
Rebar Stakes
Choose rebar stakes when you want the ribbed surface and tensile strength of reinforcing bar for driven hold-down work.

Common applications

Where it is used.

Application

Timber form attachment

Backs timber boards and resists lateral movement during setup and pouring.

Application

Soft-ground slab edges

Anchors temporary edge boards where ground conditions require flat bearing contact.

Application

Anti-rotation support

The flat section prevents board spin and maintains form alignment through concrete placement.

What else are flat stakes called?

In the US, flat stakes are called flat nail stakes. The flat section provides a broad bearing face for ground anchoring.

What sizes are flat stakes available in?

Flat stakes are sized at 1-1/2" x 3/8" (35 x 9 mm). Lengths are supplied from 12" to 56" (300 to 1400 mm). Steel grade meets Grade 60 and above with tensile strength of 60,000 psi and above. Finishes are plain or coated.

Concrete systems

Flat-section form support

The flat bearing face resists board rotation at slab and footing edges. Round, Rebar and Square Stakes provide alternative profiles; Formwork Pins handle holed or pin-driven installations.

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Flat Stakes / C-mouth Stakes specifications