By Kent · Lock Depot Staff Writer

The closer is the easy part. The arm is where the order goes wrong.

A maintenance man calls and says he needs a Sargent 281 closer. I ask which one. Long pause. On this series the letters after 281 name the arm, and the arm decides how the closer sits on the door, whether it holds the door open, and whether it fits the frame in front of you. Order the wrong letter and the closer sits in a box while the door keeps slamming.

The Sargent 281 Series Powerglide is a cast iron surface closer with a full rack-and-pinion mechanism. It is ANSI/BHMA Grade 1 and UL listed for fire-rated door assemblies. Closing speed, latching speed and backcheck all adjust separately. That body is the same on every model below. What changes from one part number to the next is the arm and the duty rating.

Reading the 281 part number

The product titles spell it out. Using the oil rubbed bronze versions (finish code 10BE) as the example:

• 281-O-10BE: regular duty, standard arm.
• 281-H-10BE: regular duty, hold-open arm.
• 281-O8-10BE: regular duty, mortise foot arm.
• 281-O10-10BE: heavy duty, standard arm.

The code at the end is the finish and nothing else. I read a part number from the middle out: arm and duty first, finish last. Each of the four above is in stock as a separate part number.

Standard arm: the default for a reason

The O is the plain regular-duty closer with a standard arm. It does one job: pull the door shut and latch it. If you are replacing a worn closer on an ordinary interior door, this is usually the right call. Look at the old closer before you order. If the arm reaches out from the closer to the frame at an angle, you have a standard arm, and a standard arm closer goes back where it came from without new holes.

One warning the catalog page makes and I repeat to every customer: a parallel arm bracket takes its own arm. Standard arms and parallel arms are not interchangeable. If the old arm lies flat along the door and runs parallel to it, you have a parallel mount, and you need to say so when you call.

Hold-open arm: for a door that has to stay open

The H adds a hold-open to the arm. Push the door to the set point and it stays there until someone pulls it shut. A stockroom, a delivery door, a shop door in a busy hour. It saves you the wedge on the floor and the gouge in the frame where the wedge always ends up.

Here is the catch. A mechanical hold-open is not a release tied to your fire alarm. A fire door has to close and latch in a fire, and a door wedged open with a closer arm is how a rated door ends up propped open at inspection. If the door is rated and has to stay open, that is a different job: an electromagnetic holder wired to the alarm. For a non-rated opening, the H is the simple answer. We wrote up the same standard-or-hold-open question for a concealed closer in our piece on standard versus hold-open arms.

Mortise foot arm: check the frame first

The O8 is the mortise foot arm version at regular duty. I do not have a mounting template for it in the catalog, so I will not tell you the dimensions. What I will tell you is how I decide: go to the door, look at the frame where the arm lands, and match the arm foot to what is there. If the old closer had a mortise foot arm, order the O8. If it did not, you probably want the O. Send us a photo of the top corner of the frame and the old closer if you are between the two, and we will point at the right letter.

Heavy duty: the doors that get hit all day

The O10 is the heavy duty closer with a standard arm. It belongs on the doors that take a beating: a main entrance with hundreds of passes a day, a door facing wind, a school corridor, any door where the last closer kept getting replaced because it was a size too small. A heavy duty closer on a light interior door is money you did not need to spend. A regular duty closer on a hard-used door is a call-back in three months. I would rather you buy the heavier one once than the lighter one twice.

Wondering how another maker handles the same regular, parallel and top-jamb mounting question? Our piece on the Norton 8000 series arm options walks through it from the Norton side.

A quick way to pick

Stand at the door and ask four things. Does the door have to stay open? That points to the H. Is it an ordinary door with an ordinary standard arm closer on it now? The O. Is the old closer a mortise foot arm? The O8. Does the door take real abuse? The O10. Then pick the finish. Say the arm out loud when you call, because a regular duty body with the wrong arm is the most common mix-up I hear about.

The product page for each model carries a note about the delayed action option, which keeps the door open longer on healthcare and accessibility jobs. If your door needs that, call before you order and we will confirm what is available for your model.

Common questions

Does the Sargent 281 come with the arm?

The part number names the arm, but the product pages also note that arms may be sold separately. Check the page for the exact model you pick, and call us if you are unsure what ships in the box.

Can I put a hold-open 281 on a fire door?

Only if the door still closes and latches on its own. A mechanical hold-open that stays set does not release in a fire. If a rated door has to stay open, use a holder tied to the fire alarm, and ask your inspector.

How do I know if I need regular duty or heavy duty?

Look at how the door is used. Heavy traffic, wind, or a history of bent arms points to the heavy duty O10. A quiet interior door fits the regular duty models.

Is a standard arm the same as a parallel arm?

No. A standard arm reaches across to the frame at an angle. A parallel arm lies along the door. They use different brackets and the arms are not interchangeable.

What do the letters at the end of the part number mean?

The finish. 10BE is oil rubbed bronze. Choose the finish last, after the arm and the duty rating.

More hardware from this maker is on our Sargent page. Not sure which arm your door takes? Call with a photo of the old closer and the frame.