Skip to the beginning of the images gallery

Keystone BOX/K-150 Solid Wall Box Lintel 4000mm INS

SKU

KBX154INS

£284.34 £236.95

Product Information

Keystone BOX/K-150 insulated box lintel, 4000mm (13ft 1in) length for solid walls.
Designed for 150mm (6in) wide solid walls, supporting internal openings with standard duty load.
Built-in insulation enhances thermal performance on site.
Perforated design provides a strong plaster key for a secure finish.
Minimum 150mm bearing each end; lintel must be bedded on mortar and propped during installation for best results.

Details

The Keystone BOX/K-150 4000mm insulated box lintel is a specialist structural support designed for builders and site managers working with 150mm solid walls. Its integral insulation improves thermal efficiency, making it a smart choice for internal openings where both strength and energy performance matter. Please note, this lintel is supplied in standard 150mm increments and must be installed with proper bearing and support.

Application

This lintel is typically used to carry the full load of wet masonry above internal openings such as doorways or small window recesses in solid walls 150mm thick. The perforated box design provides a reliable plaster key, allowing a neat and secure finish. It’s essential to provide a minimum 150mm bearing on both sides, bedding the lintel on mortar and propping it to maintain structural integrity during construction.

Dimension

Length: 4000mm (13ft 1in)
Height: 215mm (8.5in)
Width: 145mm (5.7in)
Suitable for wall thickness: 100-215mm

Material

Galvanised steel with integrated insulation for enhanced thermal properties
Perforated surface for plaster adhesion

Type

Box lintel for solid wall applications
Standard duty structural lintel with insulation (INS variant)

All descriptions are provided as guidance; please contact our sales team for detailed technical support and to confirm suitability for your project.

More Information

More Information
Type	Box Lintels
Loading	Standard Duty
Length	4000mm
Weight	67.980000
Manufacturer	Keystone
Sap Id	KBX154INS

Customer Reviews

No reviews yet on this product

Delivery Information

Delivery availability

We deliver to most mainland UK addresses. Some postcode areas are excluded – please see the full list below.

Delivery charges

Delivery costs vary depending on your location, the products ordered, and the delivery method selected. All delivery charges are calculated clearly at checkout.

Fuel Surcharge

Information on our added Fuel Surcharge can be found at https://condell-ltd.com/fuel-surcharge-notification

Delivery dates

You can request a preferred delivery date at checkout. While we aim to meet this wherever possible, availability may depend on stock levels and third-party delivery schedules. If your chosen date is unavailable, a member of our team will contact you to arrange an alternative.

Delivery method

All deliveries are made kerbside as standard. For health and safety reasons, drivers are unable to carry materials beyond the kerb. If you have specific access requirements, please contact us before placing your order.

Delivery exclusions

We currently do not deliver to the following postcode areas:

AB16, AB21–22, AB30–AB38, AB41–AB56, BT1–BT94, CA2, CA15, CA28, DD1, DD8, DD9, DG1, DG2, DG10–DG14, DG16, FK18–FK20, GY1–GY9, HS1–HS9, IM1–IM9, IV1–IV5, IV7, IV12–IV13, IV21–IV28, IV30–IV36, IV40–IV56, JE1–JE4, KA1, KA4–KA6, KA14–KA15, KA18–KA21, KA27–KA30, KW1–KW3, KW6–KW17, KY6–KY10, KY13–KY16, LL49, LL58–LL62, LL64–LL78, PA17–PA78, PH11, PH19–PH26, PH30–PH33, PH35–PH38, PH40–PH44, PH49–PH50, PO30–PO41, SA68, SA71, ZE1–ZE3

Important delivery terms

Shortages must be reported within 48 hours and noted on delivery paperwork
All deliveries must be signed for; redelivery charges may apply
Deferred deliveries may incur storage charges
Collected orders are not subject to delivery charges
Returns are subject to a 25% restocking fee (delivery charges excluded)
Made-to-measure items are non-refundable
Reasonable access to the delivery point must be available; additional charges may apply