Make a lego® tool
Build a simple LEGO® tool such as a brick wrench or clamp to tighten, lift, or hold pieces while testing designs and learning engineering basics.
About this activity
Build a simple LEGO® tool such as a brick wrench or clamp to tighten, lift, or hold pieces while testing designs and learning engineering basics.
What you need
Step by step
- 1
Step 1
Gather all the Materials Needed and clear a flat workspace.
- 2
Step 2
Decide which tool to build today: a clamp to hold pieces or a wrench-style tool to grip and twist bricks.
- 3
Step 3
Build a sturdy handle by stacking bricks in a straight line until it feels comfortable to hold.
- 4
Step 4
Attach a solid plate or brick at one end of the handle to be the fixed jaw base.
- 5
Step 5
Connect a hinge or clip piece to the handle just behind the fixed jaw to create a pivot point.
- 6
Step 6
Build a small movable jaw on a separate beam or plate and attach it to the other half of the hinge so it can open and close.
- 7
Step 7
Add small flat tiles or smooth pieces to the faces of both jaws so they grip LEGO parts without slipping.
- 8
Step 8
Hook a rubber band from the back of the handle to the movable jaw to pull the jaw closed and create clamp tension.
- 9
Step 9
Test your tool by placing a LEGO piece between the jaws and closing the movable jaw; adjust the rubber band tension or jaw pads until it holds firmly.
- 10
Step 10
Share your finished LEGO® tool and what you learned about testing and adjusting designs on DIY.org
Fun facts
How do I build a simple LEGO® wrench or clamp to tighten, lift, or hold pieces?
Start with a sturdy base (plate or stacked bricks). Build two opposing jaws from plates or slope bricks and hinge them with clip-and-bar or Technic pins to create a pivot. Add a lever arm or axle to operate the jaws; use a gear, rack, or rubber band for adjustable tension. Test on small bricks, adjust jaw width and friction, then refine for better grip. Encourage kids to try different jaw shapes and leverage to learn engineering basics.
What materials do I need to make a LEGO® tool (wrench or clamp)?
Gather basic bricks, plates, hinge pieces or clip-and-bar elements, Technic beams or liftarms, pins/axles, small gears or bushings, and a baseplate. Rubber bands are handy for tension and grip. Optional: small slope pieces for jaws, a soft rubber tile to improve friction, and a few specialty clips or clamps. Use only child-safe LEGO parts and keep extra tiny pieces away from young children.
What ages is building a LEGO® tool suitable for?
This activity suits a range: ages 5–6 can build with close adult help; ages 7–9 can assemble simple clamps and learn basic leverage independently; ages 10+ can design more complex Technic versions with gears and axles. Adjust complexity and supervision to the child’s fine motor skills and attention span. Always monitor younger kids because of small parts and encourage older kids to document design changes.
What are the benefits of making a LEGO® tool with my child?
Building a LEGO® wrench or clamp teaches engineering basics like levers, pivots, and friction while boosting problem-solving, spatial reasoning, and fine motor skills. It encourages trial-and-error, creativity, and patience as children test and refine designs. Working together promotes communication and cooperative play. The hands-on process also builds confidence in planning and iterating simple mechanical solutions.
Watch & Learn
Need help?
What can we use if we don't have a LEGO hinge or clip or the exact rubber band listed?
Use a Technic pin or axle through stacked plates as the pivot instead of a hinge, and substitute a hair elastic or two small rubber bands hooked from the back of the handle to the movable jaw for clamp tension.
My movable jaw doesn't close smoothly or the clamp doesn't hold—what should we try?
Make sure the hinge pin is aligned and not loose, add or reposition the flat tiles on both jaws for better grip, and increase rubber band tension by using a stronger band or doubling bands while testing with a LEGO piece between the jaws.
How can we make this activity easier for a 4-year-old or more challenging for a 10-year-old?
For younger kids, pre-build the sturdy handle and fixed jaw and use larger bricks plus one strong rubber band so they only attach the movable jaw, while older kids can build a Technic-pinned hinge, experiment with multiple rubber bands for adjustable tension, or convert the design into a wrench-style gripper.
How can we improve or personalize our finished LEGO tool after testing?
Add colored flat tiles or foam pads to the faces of both jaws for better grip and decoration, create a simple locking clip on the hinge to hold positions, or mount the handle to a baseplate so the tool becomes a small bench clamp for repeated adjustments.