The distance from the center of the pivot shaft to the center of the wiper blade. Find out more about how to measure a wiper arm.

The distance from the center of the pivot shaft to the center of the wiper blade.  Find out more about how to measure a wiper arm.

The place where the curve of the glass becomes too great to wipe.

The place where the curve of the glass becomes too great to wipe.

The connector at the end of the pantograph arm which attaches the idler to the driver and mounts the blade.

The connector at the end of the pantograph arm which attaches the idler to the driver and mounts the blade.

A washer fluid fitting that provides passage through the bulkhead. The washer hose from the pump connects to the inside of the fitting. The washer hose to the nozzles connects to the outside of the fitting.

A motor that needs a power source to park the terminal. When the park circuit is energized, the motor continues to run until it reaches its assigned park position. There, the power is disconnected on the motor’s park-plate internally. The motor stops because the power is disconnected.

A motor that needs a power source to park the terminal. When the park circuit is energized, the motor continues to run until it reaches its assigned park position. There, the power is disconnected on the motor’s park-plate internally. The motor stops because the power is disconnected.

A link with two bearings that connects the motor drive arm to the pivot shaft.

The straight-line distance that the center of the blade travels in its sweep pattern measured in inches.

The area of the windshield glass that you can see through from the inside edges of the moulding.

A crank arm that bolts onto the output shaft of the motor and drives the connecting linkage.

A motor that is electrically locked in its park position. When the circuit is energized, the motor continues to run to its assigned park position. There, it stops very positively and will not move. This method of wiring is usually utilized where high winds or heavy snow carry the momentum of longer arms and blades past the normal coast to park circuitry.

The unswept area of the glass beyond the cord length.

A sweep pattern in which the blade stays parallel to the side of the glass.

A plate which supports the pivot post for the idler of a pantograph arm.

The pivot shaft transfers power from the wiper motor via an oscillating connecting link to the wiper arm.  The wiper arm is attached to the pivot shaft on the outside of the vehicle. Learn more from our Bulkhead Thickness and Pivot Shaft Explainer.

An arced sweep pattern. The arms are sometimes called “standard arc” or “pendulum” type.

The amount a wiper arm moves in and out as it follows the curvature of the glass.

A channel at the end of the wiper arm where the center of the wiper blade attaches.

The arc of the wiper arm measured in degrees.

The amount of force exerted on the blade by the spring tension of the wiper arm.