Thames & Kosmos Mega Cyborg Hand STEM Experiment Kit
- 200+ plastic pieces and piston tubes
- Water-filled hydraulics, no motors or electricity
- 3 configurations: left hand, right hand, claw
- 40-page full-color manual
- Ages 7 and up per manufacturer
- 1 year manufacturer warranty
Last refreshed Oct 3, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A build-it-yourself hydraulic hand that you wear like a glove and operate with your own fingers. It teaches pneumatics and hydraulics without a battery.
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ASIN: B085LRW4VRModel: 620501Category: Science Kits & Toys
Overview
Thames & Kosmos supplies plastic pieces, metal springs, flexible tubing and screws to build a giant hydraulic hand. Piston tubes filled with water move the mechanical fingers, and the finished hand slips on like a glove.
Working hydraulics and a hand you can actually use for gripping are the reasons to buy this kit. The limit is the build time and the lack of care guidance for the water-filled parts.
Who it's for
Older kids who enjoy longer builds and want to learn about robotics. Younger children and anyone expecting motors or lights should choose a different kit.
Pros and cons
- Real hydraulic operation
- Three build configurations
- Adjusts to different hand sizes
- Detailed full-color manual
- Longer build time
- Care steps not described
- Water-filled parts need handling care
Performance notes
Squeezing the pistons pushes water through the tubing so the mechanical fingers follow your own, so grip force comes from your own hand movement. Different build configurations switch between a left hand, a right hand and a claw.
Where it stands among science kits & toys
- #4 most-searched brand and model of the 9 science kits & toys lines we track (by search demand, not sales).
From the specs of the 13 science kits & toys we list; not a test result.
Specifications
| Model | 620501 |
|---|---|
| Dimensions & fit | |
| Item dimensions | 10 x 4.75 x 11 inches |
| Item weight | 1.8 pounds |
| Power & efficiency | |
| Batteries | No battery required |
| Included components | |
| Included components | 200+ plastic building pieces, metal springs, flexible tubing, screws, manual |
| Warranty & support | |
| Warranty | 1 year against manufacturer defects |
| Other details | |
| Recommended age | 7 years and up |
| Educational objective | STEM, hydraulics, pneumatics, robotics |
Frequently asked questions
How do I care for the Mega Cyborg Hand after it is built?
The listing gives no care steps. A 40-page manual is included, and the pistons are filled with water, so follow the manual for filling and emptying.
Does the Mega Cyborg Hand need batteries?
No. The listing says no battery is required and no motors or electricity are used.
Will the Mega Cyborg Hand fit a small hand?
The description says it can be adjusted to fit virtually all hand sizes.