Anchor channel

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Anchor channels, invented by Anders Jordahl in 1913, are steel channels cast flush in reinforced concrete elements to allow the installation of channel bolts for the fastening of components.

Anchor channels consist of steel C-shaped channels and anchors (mostly headed studs) which are connected to the channel by welding or riveting/forging. The channels are supplied with foam filler to prevent concrete from leaking into the channel when the concrete is poured.

The system includes T-shaped bolts which are called T-bolts or channel bolts in the regulations. They are also called hammer head bolts, serrated bolts or hook-headed bolts based on their shape and function. The T-bolts are inserted into the anchor channel after the foam filler has been removed. The T-bolts can be moved along the channel length to allow for adjustment. The adjustment of the T-bolt location is required to compensate for construction tolerances or for a change in use for a particular application. The T-bolt is then tightened to the required torque to fasten a component.