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Mercator(1) Construction Sets

Mercator(1) was a Meccano-like construction system. It was made in Belgium in the 1940s.

Manufacturer / Distributor

Mercator. Factory: 97B rue de Fierlant. Office: 73 rue Pierre Decoster. Both of Forest-Bruxelles, Belgium

Info from the Metal Constructional Systems Database for MERCATOR [1]

System Type
Hole pitch >12.7mm
1940s to known in 1949
Boss Type
Boss Thread
M4 (see comment *1)
Diametrical Pitch of Gears
25 (see comment *2)
No. of Parts in System
Hole Pitch (Spacing) (mm)
13.0 (see comment *3)
Diameter of holes in Strips(mm)
5.0 (mean)
Diameter of the Bore in Bosses(mm)
5.1 (mean)
Diameter of Axle Rods(mm)
5.0 (mean)
Types of Nuts and Bolts
Nuts: hexagonal
Bolts: tapered cheese (slotted)
(see comment *4)
Material/Finish of Nuts and Bolts
Steel with a Brass finish
(see comment *5)
Size of the Nuts across Flats (mm)
8.0(see comment *6)
Bolt diameter (mm)
6.7(see comment *7)

Parts include some unusual Plates, 4" Pulley, 3 Boilers. *1 M3 (?) in one part. 3.8x26tpi earlier (Type 1e). *2 Mod 1. *3 12.7 in MCS. *4*5*6*7 Also hex nut and slotted cheesehead bolt plain brass 8.0 7.0.

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

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

A Mercator(1) manual.
The rear cover is unfortunately missing from the copy scanned..
(added 28/06/2019)

Photos of a Mercator(1) set.
(added 07/03/2021)