Andersen® A‑Series and 400 Series casement windows use an operator mechanism to open and close the sash. When you turn the handle, the operator’s arm extends or retracts to move the window. This article applies to windows that use a split-arm operator. If your window uses a straight‑arm operator, see Straight-Arm Operators for A-Series and 400 Series Casement Windows for the correct information.
If your window is not opening or closing properly, this article can help you identify the type of operator on your window so you can order the correct replacement. Keep in mind that, depending on the vintage of your window, the replacement split-arm operator may not look the same as the operator you are replacing.
To order the correct replacement operator, you will need to determine your:
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Window vintage, when the window was manufactured
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Window handing, where the lock is located in the window frame, left or right
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Visible glass width, the dimension of the glass you can see and touch
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Operator arm length, the length of the hinged arm that pushes the window open. See below for example measurements.
You can determine your window’s vintage by locating the Andersen® glass logo on the sash. For assistance, see Identify Glass Type on Andersen® Windows and Patio Doors. Once identified, use the information below to select the correct operator from the Andersen Windows and Doors Parts Store 
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Operators by Window Vintage
The split-arm operator was introduced in 1982.
A-Series & 400 Series Operators
Used on A‑Series and 400 Series casement windows.
Additional Information
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The operator handles and operator covers are sold separately
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If your window was manufactured from 1995 to 1998 and you have not replaced your operator after 2008, you will need an adapter plate
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For more information about the operator, see Operator Adaptor Plate Information
Pictured above: Universal Split-Arm Operator
See also: Corrosion-Resistant Split Arm Operator
Shown with operator cover installed.
Perma‑Shield® Split‑Arm Operators
Before the most up-to-date iteration of our operator, different operators were used on Perma-Shield® casement windows depending on the window's width and when it was manufactured.
The operator below was used for standard, C, and wide, CW, casement windows.
Additional information
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A replacement order includes a stone-colored cover and screws
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The operator handles and operator covers are also sold separately
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The original operator cover may not have screw holes and has a mounting base with squared corners. The replacement operator has rounded corners
Pictured above: Left-Handed Split Arm Operator with Screws 1982 to 1995
See also: Right-Handed Split Arm Operator with Screws 1982 to 1995
Shown without operator cover installed.
Order Replacement Operator
When replacing an Andersen® 400 Series casement or awning operator manufactured from 1995 to 1998, you must order the current operator and an adapter plate for proper fit and installation. See Operator Adaptor Plate Information.
Pictured above: Operator Adapter - 1995 to 1998
Installation
To install a split-arm operator on your A-Series or 400 Series casement window, follow the instructions provided in How to Install an A-Series and 400 Series Casement Operator.
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