GM-83 Door Closer

Specifications

Large square-box body

The heavy-duty square-section body, for the widest and heaviest leaves in the range. Same flat-faced look as the medium square body, with more closing force behind it.

Dimensions

Straight from our product catalog. Millimetres throughout.

The drawing is our own and carries a few Chinese labels: 门框 Door frame · 门扇 Door leaf · 孔距 Hole centres · 调速阀 Speed adjustment valve · 门开180°的铰链的中心 Hinge centreline with the door open 180° · 开槽/安装尺寸 Grooving / installation dimensions · 固定板-门框的距离 Fixing plate to door frame · 摇臂旋转方向 Arm rotation direction.

What you can adjust

Adjustable closing power

Closing force is set on the unit itself rather than fixed at the factory, so one model covers a range of door sizes and can be tuned after it is hung.

Backcheck (BC)

Resists the door near the end of its opening swing, so wind or a hard shove does not throw the leaf into the wall behind it.

Delayed action (DA)

Holds the door open for a moment before it starts to close — useful where people carry things through, or where a wheelchair needs the time.

These are the factory's own adjustment ranges, not tested performance figures under EN 1154.

Build and finish

Finish

Three-layer gloss paint

Operating temperature

Down to -45 °C

The factory's own figure for cold-weather operation. Like the adjustment ranges, it is their claim rather than a result from a test report.

Taken from our own packaging label, which states it as a minimum. For context, EN 1154's durability test runs to 500,000 cycles, so this is double what the standard asks. Ask us for the test basis if the figure matters to your specification.

Finishes

Five stock finishes, and we will match another on a custom order. The swatches below are approximate — ask us for a physical sample before you match one to a frame.

• Silver
• Gold
• Black
• White
• Brown

Inside the body

• Alloy steel gear, with the piston given three extra precision-finishing operations.
• Rack-and-pinion hydraulic action, with the closing speed and the latch controlled by separate valves.
• Imported seals and needle bearings, which is what the factory credits for its leak resistance.
• High-performance spring structure, so the closing force holds up over the life of the unit.

Arm options

• Slide channel available instead of the standard scissor arm

Choosing the right size

Heavy doors. At this width and weight rating, GM-83 typically covers main entrances, heavy commercial and institutional doors, and wide leaves that need real closing force to latch reliably.

The power size is given as a range (3-6), which means the closing force is adjustable rather than fixed at the factory. That makes one unit usable across a span of door sizes, and lets the force be tuned on site if the door turns out heavier or draughtier than expected.

Check before you order

• Measure the door leaf width and compare it with the 1300 mm limit. Measure the leaf itself, not the frame opening.
• Tell us the actual door weight: our catalog's figure for this model still needs factory clarification, and we will confirm the right configuration for your door before you specify it.
• Exterior doors and doors in draughty corridors face wind pressure the specification does not account for. If the door is exposed, say so — it can push the choice up a power size.

Not sure which model fits? The selection guide walks through measuring a door and reading these numbers, or just describe your door in an inquiry and we will recommend one.