Heavy Duty Door Closers

"Heavy duty" is not a regulated term. Any seller can print it on a box, which is why two closers with the same label can be worlds apart. In a hardware store, we use the phrase for a closer with three things: a real hydraulic mechanism, adjustable spring power and a body and arm strong enough for a commercial door. The closest thing to a guarantee is an independent ANSI/BHMA Grade 1 rating.

Heavy duty guides by need

Start with the guide that matches your project:

What separates a heavy duty closer from a standard one

• Body: thicker castings hold more oil and a bigger spring. Cast iron is the classic choice for abuse.
• Arm: forged or wrought steel arms resist bending when a door is forced or caught by wind.
• Piston: a larger, hardened piston keeps its seal through more cycles and wider temperature swings.
• Adjustments: separate valves for sweep, latch and backcheck let you tune the closer to the door.
• Testing: a published grade, cycle count and UL listing tell you more than the word on the box.

Do you really need one?

You do if the door is over about 36" wide, made of steel, solid wood or iron, used more than a few dozen times a day, or exposed to wind. You probably do not for a light interior door in a quiet office, where a mid-grade closer is fine and easier on the people using it.

When you are unsure, compare the two levels side by side in our heavy duty vs extra heavy duty comparison.