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The power spring is usually positioned in a housing with the outer hook located around a pin or in a slot on the housing with the smallest internal diameter as specified below. It can also be placed in a larger housing, but with an associated decrease in force. It should be positioned on a shaft with a groove in it, in accordance with the dimensions listed below. It is also possible to slightly increase the diameter of the inner coil for placement on a larger shaft.
Stainless steel: EN 10151 1.4310
Nominal torque without effect from friction stated.
1 kp = 9.80665 Newtons, 1 Newton = 0.10197 kp
To minimise friction, the spring should be lubricated when it is fitted and the coils separated. If no lubrication is applied, there may be a reduction in spring force of up to 20%. If more torque is required, two or more springs can be placed next to each other. In such circumstances, it is preferable to position a washer between the springs. Power springs are supplied with a protective ring or nylon band that must be removed during assembly. The spring should be handled with care and held using a suitable tool whilst it is being positioned in the housing.