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Der Kleine Ingenieur(4) Construction Sets

Der Kleine Ingenieur(4) was a simple Meccano-like Construction system with some special parts. It was produced in East Germany in the 1940s.

Manufacturer / Distributor

Böhag Gera, East Germany

Info from the Metal Constructional Systems Database for DER KLEINE INGENIEUR [4] (Ref:DKI4)

System Type
Meccano principle but sig. differences
Former East Germany (probably)
Boss Type
Boss Thread
Diametrical Pitch of Gears
No. of Parts in System
16 (some significant doubt)
Hole Pitch (Spacing) (mm)
13.8 (see comment *1)
Diameter of holes in Strips(mm)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
(Screwed Rods or Bolts are used as axles.) (see comment *2)
Types of Nuts and Bolts
Nuts: hexagonal
Bolts: fillister (slotted)
Material/Finish of Nuts and Bolts
Steel with a Steel finish
(see comment *3)
Size of the Nuts across Flats (mm)
Bolt diameter (mm)

The one set seen, on Ebay, has Strips, Angle Girders, Pulleys, & parts to make cars for a Big Wheel etc. Said cars used in the Big Wheel on the lid & a Roundabout ride in the manual. *1 13.8-13.9. *2 Only Crank Handle. *3 plain aluminium Nut.

Pages from the 'Other Systems Newsletter' which contain information on this system are shown below. They can also be downloaded to your computer if desired here

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Below there are manuals/leafets and photos which can be downloaded by clicking on the appropriate image.

A Der Kleine Ingenieur(4) manual
(added 14/11/2018)

A Der Kleine Ingenieur(4) model sheet
(added 14/11/2018)

Various photos of the Der Kleine Ingenieur(4) construction system
(added 14/11/2018)