Tie Rod Nuts

Tie Rod Nuts are mating nuts for tie-rod threads. They tighten onto the rod end and seat against a Plate Washer or form face to complete the form-tie assembly.

At a glance

Tie Rod Nuts at a glance.

What it is

A tie-rod mating nut

Nut component that engages a tie-rod thread and bears on the form face.

Physical function

Engages and bears load

The nut engages the rod and bears against a Plate Washer or form face to hold the connection.

Configuration

Thread, nut and flange

Mating thread for 1/2 to 3/4 inch tie-rod diameters; Dywidag or standard nut form; plain finish.

Also known as

Tie Rod Nuts are called anchor nut in the US, tie bar wing nut in the UK, écrou de coffrage in France, Flügelmutter in German-speaking markets, dado a farfalla in Italy, and tuerca mariposa in Spanish.

English: wing nutformwork wing nuttie rod wing nut
United States: anchor nutcombi nut
UK & Ireland: tie bar wing nut
Français: écrou de coffrage
Deutsch: FlügelmutterAnkermutterFlanschmutter
Italiano: dado a farfalla
Español: tuerca mariposa

Trade names for the whole range

How it works

Threaded and tightened at the face

Thread the nut onto the exposed tie-rod end. Tighten it to seat against the Plate Washer or form face, creating the clamping force that holds the form faces together.

Common applications

Where it is used.

Application

Two-sided form-tie completion

Engages each exposed tie-rod end at the opposite form faces.

Application

Modular form-panel connection

Seats the threaded rod connection and holds the panel in position.

Application

Form-face clamping

Works with the rod and bearing plate to draw and hold the form faces together under load.

What are tie rod nuts called in different languages?

Tie Rod Nuts are called anchor nuts in the US, tie bar wing nuts in the UK, écrou de coffrage in France, Flügelmutter in German, dado a farfalla in Italian, and tuerca mariposa in Spanish. They engage the tie rod.

What sizes and thread types are available?

Tie Rod Nuts are supplied in diameters from 1/2 to 3/4 inch (M12–M20 metric) with Dywidag threading for formwork assemblies. Plain finish. Threading and sizing coordinate with the tie rod specification.

Concrete systems