Rockwood 576-US26D Gravity Door Coordinator, Satin Chrome

The Rockwood 576 is a gravity door coordinator in a US26D satin chrome finish, cast brass, built to solve a specific problem on pairs of doors. On a double door with an overlapping astragal, the two leaves have to close in the right order: the inactive leaf first, then the active leaf. If they close in the wrong order, the doors jam against the astragal and won't latch or seal. The 576 gravity coordinator prevents the active door from closing until the inactive door is closed, so the pair always shuts in sequence. It's non-handed and reversible, so one unit works on either configuration.

What a gravity coordinator does and why a pair of doors needs one

This is the part most people need explained, because a door coordinator is easy to overlook until a pair of doors won't latch. On a double door where one leaf overlaps the other (an astragal), both doors can't close at the same time, the active leaf has to land on top of the closed inactive leaf. With door closers pulling both leaves shut at once, they collide and stall. A coordinator holds the active leaf open just long enough for the inactive leaf to close first, then releases it so it closes properly against the astragal.

The 576 is the gravity type, which uses a simple gravity-operated arm rather than a bar across the top of the frame. As the doors open, the arm drops into position, and it holds the active leaf until the inactive leaf swings clear, then lets the active leaf close. Fewer moving parts than a bar coordinator, and it mounts compactly. On any pair of doors with automatic flush bolts or an astragal, especially fire-rated pairs that must latch reliably, a coordinator isn't optional, it's what makes the opening work.

Rockwood 576 specifications

• Type: Gravity door coordinator for pairs of doors. Holds the active leaf until the inactive leaf closes.

• Function: Prevents the active door from closing until the inactive door is closed.

• Material: Cast brass.

• Finish: US26D satin chrome.

• Handing: Non-handed, reversible.

• Size: 1 inch by 5-7/16 inch. Projection 7 inches.

• Door size range: Astragal on active door, 18 to 48 inches. Astragal on inactive door, 18 to 34 inches. Astragal on both doors, 18 to 30 inches. Maximum astragal overlap 7/8 inch on standard hinges.

• Fasteners: Body, two #10 x 1 inch FH SMS and two #10-24 x 1 inch FH MS. Strike, five #8 x 1 inch FH SMS.

• Standard: ANSI A156.3 Type 21.

Why choose the Rockwood 576

Rockwood is a long-established architectural hardware brand (part of ASSA ABLOY), and the 576 is its standard gravity coordinator, the same function you'd find from other makers like Glynn-Johnson, Ives, or Trimco. The gravity design keeps it simple and reliable, with fewer parts to bind than a bar-type coordinator, and the cast brass body holds up in commercial use. For a contractor or facility manager fixing a pair of doors that won't latch, or specifying new fire-rated pairs, the 576 is a clean, code-relevant choice at a sensible price, and the US26D satin chrome finish matches the most common commercial hardware.

One thing to confirm before ordering: a coordinator works together with the rest of the pair's hardware, so the doors should also have the appropriate flush bolts or astragal and closers. Check the door widths against the size ranges above (which depend on where the astragal sits), and if the pair is fire-rated, make sure the full set of coordinator, flush bolts, and closers is listed for the assembly.

Order the Rockwood 576 from American Locksets

We stock gravity coordinators and flush bolts from authorized distribution, so every part ships with a real manufacturer warranty. Compare coordinators in the gravity coordinators category, or browse all flush bolts and coordinators.