Trimco 4048 Chain Crash Stop (603 Finish Only)

It's a chain door guard style stop: a brass plate mounts on the door face and a mating holder mounts on the frame (or the reverse), with a chain between them that limits how far the door can swing open. On a door that would otherwise slam into a wall, railing, or adjacent opening, the chain takes the load instead of a floor or wall bumper. Trimco catalogs the 4048 as a crash chain for commercial use, not a residential security chain.

No. The 4048 crash stop is offered in the 603 finish only, as a single model, 4048603. If the opening has to match a different finish family, the 4048 is not the part to specify.

Plan for a mounting plate measuring 3-11/32 x 1-3/8 inches. On a narrow stile or a door with a closer arm, glazing bead, or vision light frame close to the hinge edge, lay that footprint out before drilling so the plate sits flat on solid material.

The Trimco 4048 is listed as ADA compliant. That matters on a chain stop because the hardware sits on the door face and frame rather than in the path of travel, so it doesn't create a floor obstruction the way a floor-mounted stop can. It's classified under ANSI/BHMA L03041.

Specify it as ANSI/BHMA L03041. That's the function number carried for the 4048 crash chain, and it's what a spec writer or institutional purchasing group will want on the schedule alongside the 603 finish designation.

A chain stop is the choice when there's nothing to mount a bumper to: the door swings toward open space, a stair, a glass wall, or a return where a wall stop has no backing. It stops the door in mid air by tethering door to frame. If you do have solid wall behind the door swing, a wall bumper is simpler and puts no load on the door face. If you need the door to stand open as well as stop, that's an overhead holder job, not a crash chain. The Trimco 4048 is a crash chain only.

The 4048 is built from brass and rated by Trimco for commercial rather than residential service. Brass plates give the fastener pull-out strength a chain stop needs, since the whole arresting load of the door transfers through those two plates and their screws. For fleet standardization across a building, it's a single model number, 4048603, so there's no finish or handing variable to track.