Brief description

Hand tools used to hold objects firmly, typically developed from tongs used to handle hot metal in Bronze Age Europe. They consist of two levers joined at a fulcrum.

Use / Function

Primary use: Gripping, bending, and compressing materials.
Secondary uses: Cutting wire (if equipped with cutters), holding hot objects.
Scale: Manual, individual use.

Operating principle

Pliers work on the principle of a first-class lever. The fulcrum is positioned between the effort (hand) and the load (jaws).

Mechanical Advantage: The longer handles relative to the short jaws provide a mechanical advantage, allowing the user to apply a strong gripping force with moderate hand pressure.

How to create it

Minimum functional version

Forging: Create two identical metal pieces, each with a handle side, a jaw side, and a hole for the pivot.
Assembly: Align the pivot holes and insert a rivet or bolt.
Finishing: Ensure the jaws meet flush when closed.

Technical level

Intermediate: Requires blacksmithing skills to forge the shapes and align the pivot correctly.

Materials needed

Essential materials:
- Steel: Hardened steel is best for the jaws to prevent deformation; tougher steel for the handles.
- Rivet: A steel pin to act as the fulcrum.
Tools:
- Forge, Anvil, Hammer: For shaping.
- Drill/Punch: For the pivot hole.

Variants and improvements

Slip-joint pliers: Allow the pivot to move, adjusting the jaw size range.
Locking pliers (Mole grips): Lock in place for hands-free operation.
Needle-nose pliers: Long, thin jaws for reaching into tight spaces.
Wire cutters: Integrated cutting edges near the pivot.

Limits and risks

Grip strength: Limited by the user’s hand strength unless locking mechanism is used.
Surface damage: Serrated jaws can mar soft materials; use smooth jaws or padding for delicate work.
Insulation: Metal handles conduct electricity/heat; rubber or plastic coatings are needed for electrical work.