The table below is the typical options for Waterson Closer Hinges. Many people are curious about the difference between Self-closing (K51M-450-A3) and Fluid Motion (K51M-450-B3). Here are some more detailed explanations.
| Door Info | Full mortise 4.5×4.5 | Self-closing | Fluid Motion* | Hold-open |
| 1-3/4″ < 7’0 x 4’0 ≤ 260 lbs | K51M-450-A3 | ● | ||
| K51M-450-B3 | ● | ● | ||
| K51M-450-C3 | ● | ● | ||
| K51M-450-D3 | ● | ● | ● |
*Fluid motion only works when the door opens ≤ 120° and temperature is above 0° area.
The table below is the typical options for Waterson Closer Hinges. Many people are curious about the difference between K51M-450-A3 and K51M-450-B3. Here are some more detailed explanations.
Mechanical Only = Self-Closing
Waterson pure mechanical hinges are ideal for high frequency use heavy doors. State-of-the-art heat treated carbide components and EN-certified springs ensure durability, effectiveness and longevity. Your heavy duty commercial doors will close effectively at a controlled speed every time.
Hydraulic Hybrid = Self-Closing + Fluid Motion
On the other hand, if quiet is a chief concern then you may want to consider choosing the Waterson hydraulic hybrid self-closing hinge due to oil-controlled dynamic braking. Also an effective closing component, particularly in breezy environments, Waterson hydraulic hinges respond well to wind changes with exceptional quietness without leaking.
The video below tells a better story than just words. Check it out.
| MODEL | DOOR TYPE | USAGE |
| Self-Closing = Mechanical Only |
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| Self-Closing + Fluid Motion= Hydraulic Hybrid |
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*ie. acid, chemical, clean room, chlorinated pools, salt water areas and more
What’s the Difference?
The difference between the two types defines how your door closes:
- Mechanical type: self-closing; closing speed remains mostly average from swing to latch.
- Hydraulic type:soft closing; the door specifically slows down in the hydraulic zone.
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