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Mak-A-Toy was a construction system using metal brackets to join pieces of hardboard using nuts and bolts. It was made in the USA by J.L Hammett Co., of Cambridge, Mass, probably post WW2.

Manufacturer / Distributor

J.L Hammett Co., of Cambridge, Mass, USA

Info from the Metal Constructional Systems Database for MAK-A-TOY (Ref:MTY)

System Type
Non-Meccano type
after World War Two (some significant doubt)
Hardboard / Steel
Boss Type
no boss
Boss Thread
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)
3.5 (see comment *1)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
Types of Nuts and Bolts
Nuts: hexagonal
Bolts: round (slotted)
Material/Finish of Nuts and Bolts
Steel with a Steel finish
Size of the Nuts across Flats (mm)
Bolt diameter (mm)

Hardboard parts bolted together with aluminium/Boss(es).*1 3.9 in Angle Bracket.

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