^ TOP
1. Introduction
A : The traditional glass door closer or floor spring is difficult to install, inconvenient to adjust, intrusive to interior decoration, painstaking to maintain, and they seldom last long. And the spring hinges in the market can only bear light doors. Waterson Corporation therefore invents the 3-in-1 door-closer hinge, providing customer a hinge with the functions of hinges, door closer, and door stopper. The fully stainless steel construction guarantees superior durability, and the world patented design offers easy installation, premium quality, and reliable safety.
A : Certified by UL (Underwriter Laboratories Inc.) per the standard of ANSI/BHMA-A156.17 Grade 1: 1 million opening /closing cycles test. Service life is up to 27 years if user open and close 100 times per day. (Calculation as follows)

1,000,000(times)/100(times) =10,000(days)
10,000(days)/365(days)≒27(years)

Note: the UL certification test is conducted in continuous session of opening and closing. In daily use scenario, this continuous wearing cycles are rare; therefore, the service life should be safely longer than 27 years.

In addition, Waterson Corp. utilizes their professional engineering of investment casting process to produce the Waterson hinge instead of stamping, which renders metal lack the sufficient durability. Created by investment casting, the Waterson Hinge delivers amazing and unprecedented durability and loading capacity.
A : Waterson Hinge is designed wholly mechanical, meaning no hydraulic components is used; therefore, leaking oil and time-consuming maintenance are impossible and unnecessary.
 
2. Advice for usage
A : Basically, all doors are compatible with Waterson Hinge. The following are for your reference.
Full-Mortised (K51M): fire-rated door, timber doors, metal door, glass doors with metal frames.
3D type (K51L-3D): heavy-duty hinge; suitable for doors that require adjustment for different directions.
Glass Door (K51G): suitable for glass doors; office buildings, glass doors for stores and heavy glass doors.
Gate Hinge (K51P): suitable for gates.
A : Yes! Waterson Hinge is certified and categorized by UL as “swing fire door closer”. It also passed the national test of Mingdao fire testing laboratory and certified the fire rated doors test of CNS11227 f (60B).
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A : glass doors with thickness in 8~12mm are suitable for model K51G series. Glass doors with metal frames are more suitable with model K51M of full-mortised feature.
A : various positions of installation, specs of doors, and methods of adjustments can result in different outcomes. Please read operating manual for more information.
A : The models require differentiation between right-handed and left-handed are as follows:
Type 3DL (K51L-3D)、type double L(K51L-SW)and type Glass-to-Wall(K51G-W).
A : 3 pieces of Full-Mortised type K51M 4” should suffice. If the door is over 100 KG, you need to install 1 hinge for every extra 30 KG.
A : Please install at least 3 pieces of Waterson hinge. Insufficient closing force may occur if you install only 2 hinges. To install per the installation of testing standard of ANSI A156.17 is recommended.
A : Waterson hinge is designed with fully mechanical structure and no hydraulic components is adopted, so there is no resistance present when user push the door with typical hydraulic door closer.
However, because it contains no hydraulic components, it cannot offer the buffering effect like the hydraulic types of closers.
A : Waterson Hinge is designed for inswing doors. If user install it for outswing doors, the exterior body of Waterson Hinge is exposed and can be seen by users.
A : Currently, the major functions of Waterson are set in 0~90 degrees. If users push the door over 90 degrees, Waterson Hinge can provide closing force, but not hold-open and braking effect.
A : Currently, the hold-open can be set in 85~90 deg. Hold-open at 85 degrees is ideal, because in this way, user can prevent the door from banging the wall.
 
3. Specs and operation
A : the loading capacity of the 4 types of Waterson Hinge are all the same.
Based on the thicknesses of doors, K51M comes with 4 sizes of leaves:
K51M-350,leaf size3.5",suitable door thickness 30~40mm.
K51M-400,leaf size 4",suitable door thickness 35~45mm.
K51M-450,leaf size 4.5",suitable door thickness 40~50mm.
K51M-500,leaf size 5",suitable door thickness 45~55mm.
A : User have to embed the 3D regulator in the door frames. User can only use the regulator when the door and the door frames are not finished. Please contact your door supplier or us for advice.
A : Please see the picture below for reference. When the door is opened to 90 degrees, the distance of the door panel to the wall with the K51L SW is bigger than that of K51M.
In the same building, C is bigger than B, therefore it provides bigger space for the elder, little children, or physically challenged to pass the door easily.
 
4. Installation
A : We don’t provide the installation service. However, if you have any questions or problems regarding the installation of Waterson Hinge, please feel free to contact your door supplier, technician or us for advice. Please also check the installation manual for reference.
A : Full-Mortised (K51M) comes with Hex Socket Flat Screw M6*P1.0*12L (for metal doors) and Flat Head Screw#12*1-1/4L(for wooden doors)。
Outdoor gate hinge (K51P) comes with Hex Socket Flat Screw M6*P1.0*16L
Glass door hinge comes with (K51L-3D) M6*20L and M6*16L
3DL (K51L-3D) comes with Hex Socket Flat Screw M6*P1.0*12L (for Waterson Hinge) and Flat Head Screw#12-24UNC*1/2"L (for regulator) .
A : For K51M, we suggest the embedding installation. After embedding, the distance between door panel and door frame is 1~2mm. If user cannot embed, please leave a space of 8mm for the side of hinge installation.
Please leave a space of minimum 4mm on the latch side. When use Waterson Hinge for metal doors, please make sure the strength and durability of the door panel and door frame are sufficient.
A : 2 pieces of Waterson Hinges: install the two hinge on the upper and lower side of the door. Distances of the margin of hinge to the margin of door frame are 5”+/-1/8” (127+/-3mm) respectively.
3 pieces of Waterson Hinges: the third hinge should be installed near the upper hinge. The distance of the middle of two hinge pivots should at least be 10.95” (278mm).
4 pieces of Waterson Hinges: for heavy duty doors, the distance of second and the forth hinge pivots should at least be 10.95” (278mm).
A : K51P (gate hinge) is better considering the door is already installed. User simply drill holes through the door frame and door panel, and attach the K51P hinge to the surface of door frame and door panel.
Please make sure there is enough space (at least 8mm) between door panel and door frame, if user wants to use Full-Mortise K51M, but cannot groove the surface of the door to embed the hinge. When user install the Waterson Hinge on metal door, please make sure the strength and durability of door panel and door frame are sufficient. Otherwise, there is potential risk that the door may get deformed or tilted.