'Other' Constructional and Allied Systems Info & Downloads

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Abra Construction Sets

Abra was a construction system similar to, but not compatible with Trix. There were some addition parts. It was made in Denmark up to the 1980s.

Manufacturer / Distributor

Abra Products, Denmark

Info from the Metal Constructional Systems Database for ABRA

System Type
as TRIX (inc MCX)
  to 1980s
Boss Type
Boss Thread
Diametrical Pitch of Gears
No. of Parts in System
Hole Pitch (Spacing) (mm)
7.85 (see comment *1)
Diameter of holes in Strips(mm)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
3.4 (Screwed Rods or Bolts are used as axles.)
Types of Nuts and Bolts
Nuts: hexagonal
Bolts: cheese (slotted)
Material/Finish of Nuts and Bolts
Size of the Nuts across Flats (mm)
Bolt diameter (mm)

Like TRIX but wider range of parts, some of which are as TEKNO [1] & TEKNIK [1]. Chair-O-Planes on manual cover. *1 8.0 also reported.

The MCS document for this system is shown below. It can also be downloaded to your computer if desired here

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The report can be zoomed into, made full screen or downloaded as a pdf document by using the controls provided

There are currently no manuals, leaflets or photos etc. available for downloading. If you can supply any, please get in contact with me.