The Sargent 351 Series is a surface-mounted commercial door closer built for openings that cycle constantly: school corridors, office entrances, institutional buildings, and anywhere a door is used hundreds of times a day. Shop the 351 Series in regular, parallel, and top jamb mounting with hold-open, dead stop, and delayed action arm options, in aluminum, bronze, black, and powder coat finishes. In stock and shipping the same day.
Where the 351 Series Fits
Sargent builds several closer lines, and the differences come down to duty level and feature set rather than basic function. The 351 Series sits in the heavy-duty commercial range, which is where most institutional and high-traffic openings land.
The question to ask isn't which closer is best; it's how hard the door works. A private office door that opens twenty times a day and a school corridor door that opens eight hundred times a day need different hardware, even though both are 36-inch doors in hollow metal frames.
|
Opening type |
Daily cycles |
What it needs |
|---|---|---|
|
Private office, storage |
Low |
Standard duty is usually adequate |
|
Office suite, meeting room |
Moderate |
Standard to heavy duty |
|
Corridor, classroom, restroom |
High |
Heavy duty |
|
Main entrance, stairwell |
Very high |
Heavy duty, often with backcheck and dead stop |
Confirm the specific duty rating and cycle testing for the configuration you're ordering on the product page, since ratings differ by model within a series.
Mounting and Arm Options
|
Mounting |
Closer location |
Common use |
|---|---|---|
|
Regular arm |
Pull side of the door |
Interior doors with the pull side available |
|
Parallel arm |
Push side, arm along the door |
Corridors, keeping the arm clear of traffic |
|
Top jamb |
Frame face above the door |
Where the closer can't mount to the door |
|
Arm option |
What it adds |
|---|---|
|
Standard |
Controlled closing |
|
Hold open |
Holds the door open until pushed closed; not for rated openings |
|
Dead stop |
Stops the door at a set point, protecting the wall |
|
Hold open with dead stop |
Both functions |
|
Delayed action |
Holds the door briefly before closing, for slower traffic |
Parallel arm with dead stop is the combination most often specified on corridors, because the arm stays out of the opening and the stop protects the wall without a separate floor or wall stop.
Spring Power and Adjustment
Commercial surface closers in this class are typically size 1 through 6 adjustable, so one closer serves a range of door widths and the installer sets the power during installation.
|
Size |
Approximate door width |
|---|---|
|
1 |
Up to 28" |
|
2 |
30" |
|
3 |
34" |
|
4 |
36" |
|
5 |
42" |
|
6 |
48" |
Width is the starting point, not the answer. Door weight, exterior exposure, wind, stack pressure in stairwells and the resistance of weatherstripping all push the requirement up, while accessibility limits on opening force push it down. Confirm the sizing against Sargent's guidance and the requirements for your opening.
Separate valves control sweep speed across the closing arc, latch speed in the final few inches, and backcheck near the end of the opening swing.
Available Finishes
|
Code |
Finish |
Where it fits |
|---|---|---|
|
689 |
Aluminum painted |
The most widely stocked closer finish |
|
690 |
Dark bronze painted |
Bronze storefront framing and darker schedules |
|
691 |
Dull bronze |
Flatter bronze option |
|
693 |
Black painted |
Dark hardware schedules |
|
696 |
Satin brass painted |
Brass hardware schedules |
|
BSP |
Black suede powder coat |
Textured black for contemporary interiors |
|
WSP |
White suede powder coat |
White painted frames and light interiors |
|
EN |
Dark bronze |
Darker bronze on select configurations |
-
689 aluminum is the default and carries the deepest stock.
-
Painted and powder coat finishes can be touched up if the cover is scratched during installation.
-
Confirm the finishes available for your specific model and arm configuration on the product page.
-
Match the closer to the hinges, lockset, and exit hardware on the opening.
Benefits of the 351 Series
-
Heavy-duty construction for openings that cycle constantly.
-
Size 1-6 adjustable, covering a range of door widths from one model.
-
Three mounting positions for regular, parallel, and top jamb.
-
Arm options including hold open, dead stop, and delayed action.
-
Separate speed adjustments for sweep, latch, and backcheck.
-
Surface mounted, so it installs and services without touching the door core.
-
Wide finish range including two powder coats.
-
Ready to ship. In-stock closers ship the same day.
Applications
-
School and university corridors with heavy class-change traffic.
-
Office buildings on suite and corridor doors.
-
Hospitals and healthcare corridors, often with delayed action.
-
Fire-rated openings requiring self-closing operation.
-
Exterior entrances needing higher spring power.
-
Doors near walls using dead stop arms.
-
Institutional buildings with constant daily use.
-
Closer replacements where a lighter closer has failed prematurely.
Why Order Sargent Closers from Commercial Door Hardware
Commercial Door Hardware supplies door hardware for schools, healthcare facilities, offices, retail and institutional buildings, carrying closers, locks, exit devices, hinges, thresholds and weatherstripping from Sargent, LCN, Norton, Corbin Russwin, Accentra and Pemko.
Closer work rarely stops at the closer. A narrow top rail needs a drop plate. A visible opening needs a cover. A pair needs a coordinator so the leaves close in order. An abused door needs through-bolts rather than screws into the face. Ordering those together means the installation finishes in one visit.
Everything in this collection is in stock at Commercialdoorhardware.com and ships the same day.