# AluK aluminium window 58mm frame

> Source: https://arkaywindows.com/aluk-aluminium-window-58mm-frame/
> Author: Lukasz
> Published: 2026-02-20T15:27:50+00:00
> Modified: 2026-07-29T08:15:10+01:00

Commercial tilt before turn aluminium windows offering ventilation, security and thermal efficiency. Manufactured by Arkay Windows for commercial projects.

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# AluK Aluminium Window
58mm Frame

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### Robust, reliable, resilient.

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# Commercial & TBT Windows

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### Performance, Versatility & Style — Tailored for Every Project

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Discover the AluK 58BW HI and 58BW TBT HI — premium aluminium window systems designed for commercial projects. The 58BW HI delivers robust performance, flexible configurations, and reliable thermal and security features, while the 58BW TBT HI adds tilt-before-turn functionality for safe ventilation without compromising style or efficiency.

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border_type="simple" column_border_width="none" column_border_style="solid"][image_with_animation image_url="10024" image_size="full" animation_type="entrance" animation="None" animation_movement_type="transform_y" hover_animation="none" alignment="" border_radius="none" box_shadow="none" image_loading="default" max_width="100%" max_width_mobile="default"][/vc_column_inner][vc_column_inner column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="default" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" overflow="visible" gradient_direction="left_to_right" overlay_strength="0.3" width="1/3" tablet_width_inherit="default" animation_type="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid"][vc_column_text css="" text_direction="default"]Engineered for commercial applications, the AluK 58BW window system offers a robust, cost-effective solution for a wide range of building types. Its durable aluminium construction, flexible configurations and large size capabilities make it ideal for offices, education and high-rise projects, while strong thermal performance, weather resistance and security ensure long-term reliability.[/vc_column_text][/vc_column_inner][vc_column_inner column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="default" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" overflow="visible" gradient_direction="left_to_right" overlay_strength="0.3" width="1/3" tablet_width_inherit="default" animation_type="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid"][/vc_column_inner][/vc_row_inner][/tab][tab icon_family="none" title="58BW TBT HI" id="1781013312312-2" tab_id="1781013312312-2"][vc_row_inner equal_height="yes" content_placement="middle" column_margin="default" column_direction="default" column_direction_tablet="default" column_direction_phone="default" text_align="left" row_position="default" row_position_tablet="inherit" row_position_phone="inherit" overflow="visible" pointer_events="all"][vc_column_inner column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="default" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" overflow="visible" gradient_direction="left_to_right" overlay_strength="0.3" width="1/3" tablet_width_inherit="default" animation_type="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid"][image_with_animation image_url="10023" image_size="full" animation_type="entrance" animation="None" animation_movement_type="transform_y" hover_animation="none" alignment="" border_radius="none" box_shadow="none" image_loading="default" max_width="100%" max_width_mobile="default"][/vc_column_inner][vc_column_inner column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="default" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" overflow="visible" gradient_direction="left_to_right" overlay_strength="0.3" width="1/3" tablet_width_inherit="default" animation_type="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid"][vc_column_text css="" text_direction="default"]The AluK 58BW TBT (Tilt Before Turn) window system combines sleek aluminium design with versatile functionality. Its tilt-before-turn operation allows safe, controlled ventilation, while excellent thermal efficiency, weather resistance and PAS 24 security deliver reliable performance and comfort—making it a stylish and practical choice for a wide range of projects.[/vc_column_text][/vc_column_inner][vc_column_inner column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="default" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" overflow="visible" gradient_direction="left_to_right" overlay_strength="0.3" width="1/3" tablet_width_inherit="default" animation_type="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid"][/vc_column_inner][/vc_row_inner][/tab][tab icon_family="none" title="Download resources and installation guides" id="1781013312356-1" tab_id="1781013312356-5"][vc_row_inner column_margin="default" column_direction="default" column_direction_tablet="default" column_direction_phone="default" text_align="left" row_position="default" row_position_tablet="inherit" row_position_phone="inherit" overflow="visible" pointer_events="all"][vc_column_inner column_padding="padding-3-percent" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="top-bottom" column_element_direction_desktop="default" column_element_spacing="default" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" overflow="visible" gradient_direction="left_to_right" overlay_strength="0.3" width="1/2" tablet_width_inherit="default" animation_type="default" enable_animation="true" animation="fade-in-from-bottom" animation_easing="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid"][vc_column_text css=".vc_custom_1756737326748{padding-right: 10% !important;}" text_direction="default"]

### Download brochure

[/vc_column_text][fancy_box box_style="hover_desc" icon_family="iconsmind" image_url="10067" link_new_tab="true" hover_color="accent-color" hover_desc_color_opacity="0.9" hover_desc_hover_overlay_opacity="0.9" icon_position="bottom" box_alignment="left" hover_desc_bg_animation="long_zoom" border_radius="5px" image_loading="lazy-load" color_scheme="dark" secondary_content="here's some awesome text that would only be shown on hover" icon_iconsmind="iconsmind-File-Download" icon_size="34" link_url="http://arkaywindows.com/wp-content/uploads/2026/02/Aluk-58BW-HI-Commercial-Casement_June-2022.pdf" min_height="644" min_height_phone="800px"]

### Download brochure

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### Technical documents

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### Download technical documents

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Feature
58BW ST
58BW TBT HI Tilt-Before-Turn

**Frame Depth**
58mm / 70mm
58mm / 70mm

**U-Value (Double Glazing)**
1.4 W/m²K
1.4 W/m²K

**Acoustic Rating**
Rw 43dB
Rw 40dB

**Glazing Thickness**
24–40mm
28–40 mm

**Sightlines (Frame to Vent)**
75mm
86 mm

**Max Size**
Top Hung: 1750 x 2500

Side Hung: 838 x 1750
 1725 x 2300

**Min Size**
Top Hung: 300 x 350

Side Hung:300 x 300
380 x 575 / 480 x 375

**Security**
PAS 24 Option Available
PAS 24 Option Available

**Certifications**
Q-Mark, SBD
Q-Mark

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desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" overflow="visible" gradient_direction="left_to_right" overlay_strength="0.3" width="1/6" tablet_width_inherit="default" animation_type="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid"][/vc_column_inner][vc_column_inner column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="default" centered_text="true" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" background_color_opacity="1" background_hover_color_opacity="1" column_backdrop_filter="none" column_shadow="none" column_border_radius="none" column_link_target="_self" overflow="visible" gradient_direction="left_to_right" overlay_strength="0.3" width="2/3" tablet_width_inherit="default" animation_type="default" bg_image_animation="none" border_type="simple" column_border_width="none" column_border_style="solid"][split_line_heading animation_type="line-reveal-by-space" font_style="h2" text_color="#f8d849" line_reveal_by_space_text_effect="default" content_alignment="default" mobile_content_alignment="inherit" link_target="_self" text_content="A Closer Look at the Design, Performance and Finishing Touches" text_direction="default"][/split_line_heading][/vc_column_inner][vc_column_inner column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="inherit" column_padding_position="all" column_element_direction_desktop="default" column_element_spacing="default" desktop_text_alignment="default" tablet_text_alignment="default" phone_text_alignment="default" 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# FAQ

[/nectar_responsive_text][divider line_type="No Line" custom_height="33px"][toggles style="minimal" accordion="true" accordion_starting_functionality="closed"][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="What’s the difference between the 58BW HI and ST HI versions?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]

The ST HI is our residential offering, giving slimline aesthetics, while the standard HI version is used predominantly for commercial projects with it's more robust sash and increased performance specs.

### 

[/nectar_responsive_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="Can I use these windows in high-rise applications?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]

Yes. All versions are designed for low and high-rise suitability, with internal or external glazing options and pressure-tested up to Class E2400 wind resistance.

[/nectar_responsive_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="Are these windows compliant with building regulations?"][vc_column_text css="" text_direction="default"]

Yes. With U-values from 1.2 W/m²K (triple glazed) and Green Guide A ratings, the range is compliant with Part L thermal performance standards.

[/vc_column_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="Is flush design available on all models?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]No. The flush finish is specific to the **58BW HI Flush Casement** model, designed for sleek, modern homes with a minimalist profile.[/nectar_responsive_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="How do the TBT Tilt Before Turn Windows Open?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]

They open in two ways using a single handle: in **tilt mode**, the top of the sash tilts inward slightly, allowing secure ventilation while remaining locked at the sides and bottom; in **turn mode**, the entire sash swings fully inward like a door, providing maximum airflow and easy access for cleaning or emergency escape. Both opening styles always **swing into the room.**

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