Thames & Kosmos Mega Cyborg Hand - 203-Piece Hydraulic Kit

Thames & Kosmos Mega Cyborg Hand turns water pressure into a wearable mechanical hand. The kit uses 203 pieces, piston tubes, and finger controls rather than motors or batteries, making the build a hands-on introduction to hydraulics and mechanical movement.

How the Hydraulic Hand Works

The assembled hand is operated by the builder's own fingers. Water-filled pistons transfer pressure through the tubes, allowing the mechanical fingers to move and grip objects; the design requires no batteries or electricity.The official product description identifies the hydraulic system and 203-piece construction.

The frame can be configured as a left hand, right hand, or claw-like arrangement with the thumb centered. It also adjusts to virtually all hand sizes, so the same completed model can support several operating positions.

Kit Size And Contents

The US version carries model number 620501. Its listed product dimensions are 10 x 13 x 4.7 inches, and its product weight is 1.8 pounds; the official specifications also identify the kit as battery-free.Thames & Kosmos lists model 620501 at $44.95.

A 52-page manual guides assembly and experimentation. The manual covers the component frames, hand structure, finger mechanisms, and hydraulic operation, while the box is aimed at children who can work through a multi-stage construction project with adult support when needed.The model-specific manual documents the 620501 assembly sequence and operating limits.

US Price And Age Range

Thames & Kosmos lists the Mega Cyborg Hand at $44.95, while Target shows the same 620501 kit at $23.99 as of 09/23/2026.Target lists the US kit at $23.99 The retailer also identifies the package as battery-free and includes an instruction guide.

The official US listing gives an age recommendation of 7 years and up. The German KOSMOS materials describe the related Cyborg-Hand experiment kit for ages 10 and older, so US shoppers should use the age marking printed on the package they receive. Small parts require supervision around younger children.

Who This Kit Suits

The Mega Cyborg Hand fits the STEM experiment-kit category rather than an electronic robot category. Its strongest teaching subjects are hydraulic pressure, mechanical linkages, hand movement, and iterative assembly.

Compared with a motorized robot kit, the 620501 model has no powered electronics, charging port, or battery compartment. That keeps the mechanism visible and makes the hand's movement depend on water-filled pistons and the user's own finger motion.

Verdict For Hands-On STEM Play

The Mega Cyborg Hand is best suited to children and families looking for a substantial construction project with a visible mechanical result. Its 203 pieces and 52-page manual create more assembly work than a simple pull-back toy, while the 10 x 13 x 4.7-inch package footprint and 1.8-pound product weight make it a sizable kit for a shelf or activity table.