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.

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

Flat Stakes / “C” Mouth Stakes go by flat nail stake in the US, flat formwork stake in Australia and New Zealand, Abschalpflock in German-speaking markets, and estacas planas in Spanish.

United States: flat nail stakeflat steel stake
Australia & NZ: flat formwork stake
Deutsch: Abschalpflock
Español: estacas planas

Trade names for the whole range

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 it for general board retention, with a round section that drives cleanly beside timber or plywood boards.
Flat Stakes / “C” Mouth Stakes This page
Choose it when you want a flat face bearing against the board and a section that resists turning in the ground.
Square Stakes
Choose it when you want a square section with flat sides to set against the board.
Rebar Stakes
Choose it when you want the ribbed surface of reinforcing bar gripping the ground.

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 are flat stakes called in other markets?

Flat Stakes are called flat nail stakes in the US, flat formwork stakes in Australia and New Zealand, and Abschalpflock in German-speaking markets. 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 inches (35 x 9 mm). Lengths are supplied from 12 to 56 inches (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.

Explore concrete systems

Flat Stakes / C-mouth Stakes specifications