Ford Focus Mk3 5Dr Door Window Glass AS2 Front Left N/S BM51-A21411-AB

Ford Focus Mk3 5Dr Door Window Glass AS2 Front Left N/S is an original component from the Car windows category, designed for installation in the front left door of the five-door version. Thanks to its factory-fit design, it ensures proper guidance in the window channels, correct operation with the lifting mechanism, and a stable seal against the vehicle body.

Specifications and technical data

• SKU: BM51-A21411-AB
• Mark: Ford
• Condition: Used
• OEM Part Number: BM51-A21411-AB
• Substitutable numbers: BM51-A21411-AB, BM51A21411AB, 1742302
• Location on the vehicle: Front, Left
• Part type: Front Side Window
• Category: Car Glass

Purpose and fitment

The window has been specifically designed for the front left door area of the Ford Focus Mk3 five-door model, taking into account the door frame geometry, seal shapes, and the position of the mirror and A-pillar. Proper edge profiling allows for smooth door closing, reduction of wind noise, and maintenance of the vehicle's factory side profile.

The AS2 marking indicates the use of glass with specific light transmission and safety parameters, compliant with homologation requirements for side windows. As a result, the glass meets standards regarding visibility, impact resistance, and behavior upon breakage.

Technical characteristics of the glass

The component is made of tempered automotive glass, adapted to operate in varying temperature and mechanical conditions. The tempering process increases resistance to stresses resulting from bodywork movement, and in the event of damage, the glass shatters into small, blunt fragments, which reduces the risk of injury.

Precise edge finishing and appropriate mounting holes and cutouts allow for correct seating in the window regulator brackets and stable guidance in the factory channels. This ensures proper cooperation with the lifting mechanism, whether manual or electric, if equipped in the vehicle.

Benefits of using an original Ford window

Using an original door window in a Ford Focus Mk3 allows for maintaining optical consistency of all glazing in the vehicle – in terms of color, tint level, and surface quality. This is important both for driving comfort and for the operation of safety systems and interior lighting, which rely on predictable light distribution.

Key advantages include:

• factory fitment to the front left door frame,
• compliance with AS2 safety standards for side windows,
• stable cooperation with the original lifting mechanism,
• maintenance of proper acoustic insulation and reduction of wind noise around the body.

Condition of the item and practical application

The presented window belongs to the group of used original parts, which allows for combining a favorable purchase cost with the preservation of factory specifications. This solution is particularly useful for post-accident repairs, replacement after point damage, or when restoring the side area of the bodywork, where maintaining consistency with equipment installed on the production line is desired.

Before installation, it is recommended to verify compatibility with the specific vehicle equipment version and compare the shape and mountings with the removed window, which facilitates trouble-free installation and reduces service time.

Related windows and part selection

If you are planning a comprehensive repair or upgrade of the side glazing area in your Ford and need other components from the same group, such as rear door windows, quarter glass, or additional side glazing, check the available parts in the Ford car windows category.

To better select the appropriate window for a specific body version and avoid ordering errors, it is worth using practical tips on identifying markings on the glass and OEM numbers – you will find them in our guide: No more bad purchases! How to professionally select used car parts, saving time and nerves.