Choosing the perfect door knob or handleset starts with one essential step—measuring your door correctly.
This guide walks you through the exact measurements needed to ensure your new hardware fits smoothly and securely.
1. Measure Door Thickness (Most Important Step)
Standard U.S. interior doors measure:
- 1-3/8" thickness → MOST common
- 1-3/4" thickness → Entry doors or solid-core doors
✔ Make sure your hardware supports your door thickness.
Most Seny Hardware knobs fit 1-3/8" to 1-3/4".
2. Measure the Backset
Backset = distance from door edge → center of borehole.
Two U.S. standard sizes:
-
2-3/8"
-
2-3/4"
✔ Most homes use 2-3/8"
✔ Entry doors may use 2-3/4"
3. Measure the Borehole Diameter
Typical: 2-1/8" hole for knobs & levers
Dummy knobs do not require a borehole.
✔ If your door has NO hole → choose dummy knobs or surface-mount plates.
4. Confirm Latch Hole Size
Latch hole (on door edge): usually 1" in diameter.
Hardware compatibility requires this to match.
5. Consider Door Swing Direction
Is your door:
- Left-hand
- Right-hand
- Reversible?
Levers require correct handing; knobs do not.
Conclusion
Correct measurements ensure perfect fitment and effortless installation—saving you frustration and returns.
👉 CTA：Shop Hardware That Fits Standard U.S. Doors → Seny Hardware
