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Erector Senior Construction Set

Erector Senior was a construction system to make life-size wheeled toys that kids could ride on. It was made in the USA from 1922 to 1923.

Manufacturer / Distributor

The A.C. Gilbert Co., New Haven, Connecticut, USA

Info from the Metal Constructional Systems Database for ERECTOR SENIOR

Gilbert Erector
System Type
Non-Meccano type
1922 to 1923
8-32;14-20 p
Boss Type
Boss Thread
14-20 (probably)
Diametrical Pitch of Gears
No. of Parts in System
Hole Pitch (Spacing) (mm)
25.4 (multiples of value shown, including half.)
Diameter of holes in Strips(mm)
4 (probably)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
Types of Nuts and Bolts
Nuts: square
Bolts: round (slotted)
Material/Finish of Nuts and Bolts
Size of the Nuts across Flats (mm)
Bolt diameter (mm)

Large steel components, Wheels, to make life size wheeled toys, also Cranes etc. aluminium development of GILBERT NEW WHEEL TOY.

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

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