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Waterson hinge systems are an innovative and effective self-closing solution. Each system comprises a combination of hinges that perform different functions (see Hinge Type Table). When we combine these distinct types we create four specific systems that become either purely mechanical,hydraulic hybrid, mechanical + hold open or hydraulic + hold open. You can choose the system that best meets your closing needs.

A Purely Mechanical System includes three hinges — two SA and one SA1 type.


Each hinge is designed with innovative dual functions that are located on opposite ends of the barrel — spring tension (S) and swing speed (A). For example, our SA type provides spring tension (S) to close the door and swing speed (A) to reduce closing speed. Waterson offers six distinct types — DS, SA, SA1, HS, SB & HA(noted on the inside leaf). These can be configured to meet your particular needs. For more information see the Hinge Type Table below.

waterson hinge cut out


Each hinge type includes two of the following five distinct functions: spring power, swing speed, latch speed, hydraulic buffer, and hold open. Spring power refers to the closing force that causes door movement. Swing speed is the friction that causes the door to slow from 90° to 20°. Latch speed refers to the friction created to slow the door from 20° to 0°. Hydraulic buffer is the oil activation zone. Hold open keeps the door open at 90° . For more information see key functions below:

       S: The numerical panel (S) on the SA, SA1, SB, and HS types is an industrial spring that provides tension — closing force from 90° to 0°.

       A: The hex nut end on the SA and HA types is a swing speed braking mechanism that functions from 90° to 20°.

       A1: The hex nut end on the SA1 type is a latch speed braking mechanism that functions from 20° to 0°.

       H: Oil engaged hydraulic component (H) on the HA and HS types provides the hydraulic buffer to create a quiet and smooth closing door swing.

       B: The hex nut end (B) on the SB type is a hold-open feature keeping the door open at 85°.

WATERSON Hinge Type Table

DS Top: Spring Power
Bottom: Spring Power
Dual door closing force
SA1 Top: Spring Power
Bottom: Mechanical Friction
Door closing force & latch speed control 
SA Top: Spring Power
Bottom: Mechanical Friction
Door closing force & swing speed control 
SB Top: Spring Power
Bottom: Hold-open Feature
Door closing force & hold the door at 85°+/-5°
HA Top: Hydraulic Damping
Bottom: Mechanical Friction
Both swing&latch speed control depends on settings
HS Top: Hydraulic Damping
Bottom: Spring Power
Door closing force &Both swing&latch speed control depends on settings

Each hinge has two distinct functions, one adjusted from the hinge top, the other from the bottom. NOTE: hinges can be inverted.

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