Skip to the beginning of the images gallery

Keystone BOX/K-200 Solid Wall Box Lintel 3750mm INS

SKU

KBX2375INS

£292.18 £243.48

Product Information

Keystone BOX/K-200 insulated box lintel, 3750mm (12ft 3in) length suitable for solid walls 100-215mm wide.
Designed for standard load support over internal openings in 200mm solid masonry walls.
Built-in insulation improves thermal efficiency, ideal for energy-conscious builds.
Perforated design provides excellent plaster key for finishing.
Must have minimum 150mm end bearing each side, bedded on mortar; lintels sold individually.

Details

The Keystone BOX/K-200 Solid Wall Box Lintel 3750mm INS is a specialist insulated lintel designed for use in solid masonry walls ranging from 100mm to 215mm thick. Its insulation core enhances the thermal performance of your build, making it a smart choice for contractors and site managers focused on both structural reliability and energy efficiency. Please note that lintels are sold individually and must be installed with proper end bearings.

Application

This box lintel is engineered to support standard loads over internal openings in 200mm solid walls. Its perforated profile ensures a strong mechanical key for plaster or render, streamlining finishing works on site. Suitable for use in residential and commercial projects, the lintel can carry the full weight of wet masonry immediately upon installation, helping to maintain build programme efficiency. Correct bedding on mortar and a minimum 150mm bearing at each end are essential for safe installation. Propping lintels during construction is recommended to speed up progress.

Dimension

Length: 3750mm (12ft 3in)
Width: 200mm (7.9in)
Height: 150mm (5.9in)
Suitable for wall thicknesses between 100mm and 215mm

Material

Steel outer box with integrated insulation core for improved thermal performance
Perforated surface designed to bond with plaster and mortar

Type

Box lintel for solid masonry walls
Standard duty insulated lintel

For further technical advice or help selecting the right lintel for your project, please contact our sales team.

More Information

More Information
Type	Box Lintels
Loading	Standard Duty
Length	3750mm
Weight	53.210000
Manufacturer	Keystone
Sap Id	KBX2375INS

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