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These are all the same Eitech-like construction system. They were made in China by the Shantou Polylong Industrial & Trading Co. Ltd from around 2003 to 2010. These sets are all known collectively after their manufacturer as Polylong sets.

Shortly afterwards one or more other Chinese manufacturers also started making very similar Eitech look-alike sets. Because of their similarity to the original Polylong these have been classified as 'Polylong' Type Sets. For details see the 'Polylong' Type Sets page.

Polylong

Manufacturer / Distributor

Shantou Polylong Industrial & Trading Co. Ltd, of 111 Qingnian Road, Lianxia, Chenghai, Shantou City, Guangdong Province, China.

Info from the Metal Constructional Systems Database for POLYLONG [1] (Ref:PLY1)

Maker
 
System Type
as EITECH/CONSTRUCTION
Country
China
Dates
2003 to in production in 2010 and continuing
Material
Steel
Thread
M4
Boss Type
push fit
Boss Thread
----
Diametrical Pitch of Gears
25 (see comment *1)
No. of Parts in System
50 (approximately)
Hole Pitch (Spacing) (mm)
10.0
Diameter of holes in Strips(mm)
4.2
Diameter of the Bore in Bosses(mm)
---
Diameter of Axle Rods(mm)
4.0
Types of Nuts and Bolts
Nuts: hexagonal
Bolts: pan (crosshead)
Material/Finish of Nuts and Bolts
Steel with a Bright Zinc plated finish
Size of the Nuts across Flats (mm)
6.9
Bolt diameter (mm)
6.5(see comment *2)

Comments
Various Sets from Polylong of China. Most parts as Eitech/Construction but some others. *1 Mod.1 & finer for Motor/Gear Unit. *2 6.1 & 7.4 also reported.

Pages from the 'Other Systems Newsletter' which contain information on this system are shown below. They can also be downloaded to your computer if desired here

NOTE : If the 'Other Systems Newsletter' pages for POLYLONG [1] do not appear in the window below, then refresh the page.

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.


Photos of Polylong sets.

Page content last updated - 28th July 2022