What are the types of door hinge?

Here's a breakdown of common door hinge types, explained practically:

1. Butt Hinge (Most Common)
What it looks like: Two rectangular metal plates connected by a pin.
Where used: Interior/exterior doors in homes.
How it works: Plates screw into door edge and frame, pin allows rotation.
Key notes:
Needs recessed installation (mortised) for flush fit.
Choose ball-bearing version for heavy doors.
Visible when door is closed.

2. Concealed Hinge (Hidden)
What it looks like: Only visible as a thin slot inside the door edge.
Where used: Modern cabinets, high-end interior doors.
How it works: Hidden mechanism inside door/frame.
Adjustable screws tweak door position (left/right, up/down).
Key notes:
Completely hidden when door is closed.
Tricky DIY install – requires precise routing.

3. Piano Hinge (Continuous)
What it looks like: Long, slim hinge running full door height.
Where used: Heavy lids (toolboxes), folding partitions.
How it works: Spreads weight evenly along entire length.
Key notes:
Prevents door sagging better than standard hinges.
Screws every 2–3 inches for secure hold.

4. Strap Hinge (Decorative)
What it looks like: Long ornamental plates shaped like "H" or "L".
Where used: Barn doors, rustic gates, garden sheds.
How it works: One plate screws to door, other to frame.
Key notes:
Purely surface-mounted (no mortising).
Adds rustic charm but collects dust.

5. Spring Hinge (Self-Closing)
What it looks like: Resembles butt hinge but with coiled spring inside.
Where used: Commercial doors, fire exits, screen doors.
How it works: Spring tension slams door shut automatically.
Key notes:
Adjust tension via pins on hinges.
Loud – not ideal for quiet spaces.

6. Pivot Hinge (Top & Bottom)
What it looks like: Minimalist discs or sleeves at top/bottom of door.
Where used: Modern glass doors, revolving doors.
How it works: Door spins on vertical axis (like a turntable).
Key notes:
Handles ultra-heavy doors smoothly.
No visible side hardware – clean look.

7. Flag Hinge (Lift-Off)
What it looks like: One plate has hook, other has pin slot.
Where used: Industrial settings, doors needing quick removal.
How it works: Lift door to detach from bottom hinge.
Key notes:
Door lifts off without unscrewing anything.
Top hinge carries all weight.

Specialty Types