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Master Builder Construction Sets

Master Builder was a Meccano-like construction system. It was made in the USA from around 1915 to the mid 1920s

Manufacturer / Distributor

The Master Builder, 468 Broadway, New York, USA

Info from the Metal Constructional Systems Database for MASTER BUILDER

System Type
Meccano principle but sig. differences
circa 1915 to 1924 (some significant doubt)
8-32 (see comment *1)
Boss Type
Boss Thread
Diametrical Pitch of Gears
32 (see comment *2)
No. of Parts in System
Hole Pitch (Spacing) (mm)
Diameter of holes in Strips(mm)
4.2 (see comment *3)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
Types of Nuts and Bolts
Nuts: square
Bolts: round (slotted)
(see comment *4)
Material/Finish of Nuts and Bolts
Steel with a Nickel plated finish
Size of the Nuts across Flats (mm)
Bolt diameter (mm)
7.6(see comment *5)

Pts including 3 Formed Strip(s), curvy Triang Plate(s), 5x4,11 holes Flanged Plate(s), 8 holes Flanged Sector Plate(s) with 2x45° slots, 4" Tube, 3" Wheel. *1Trademark used from 7/14. *2and maybe 5/32x30. *3from Pinion. *44.1,4.3 in some parts. *5hex Nuts shown too. *6 and maybe 7.3.

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A Master Builder manual.