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Metalmaster was a DIY type construction system. It was made in the UK by Sanders Bros: (Sevenoaks Ltd., in the late 1940s.

Manufacturer / Distributor

Sanders Bros: (Sevenoaks Ltd., Metalmaster Works, High Street, Sevenoaks, England

Info from the Metal Constructional Systems Database for METALMASTER (Ref:MMS)

System Type
DIY type
United Kingdom
1946 (see comment *1)
5/32W (some significant doubt)
Boss Type
Boss Thread
5/32W (some significant doubt)
Diametrical Pitch of Gears
No. of Parts in System
Hole Pitch (Spacing) (mm)
Diameter of holes in Strips(mm)
4.0 (see comment *2)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
4.0 (probably)
Types of Nuts and Bolts
Nuts: hexagonal
Bolts: cheese (slotted)
Material/Finish of Nuts and Bolts
Size of the Nuts across Flats (mm)
Bolt diameter (mm)

Tool with same scope as JUNEERO. ?3/8” wide Strip, *1 Patent application in '45; manual Print Ref has 8/46. Ad in G&T 11/47 with name only & from different firm. *2 Hole takes 4.0mm Rod but not 4.06.

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