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Keystone BOX/K-150 Solid Wall Box Lintel 3150mm INS

SKU

KBX15315INS

£201.18 £167.65

Product Information

Keystone BOX/K-150 Solid Wall Box Lintel, 3150mm (10ft 4in) length for reliable support
Designed for solid walls 100-215mm thick, ideal for internal structural openings
Insulated version (INS) offers enhanced thermal performance to reduce heat loss
Perforated design provides a secure plaster key for finishing
Must be bedded on mortar with a minimum 150mm bearing each end; lintels should be propped during installation

Details

The Keystone BOX/K-150 Solid Wall Box Lintel 3150mm INS is a specialist, insulated lintel designed for use in solid masonry walls between 100mm and 215mm thick. Trusted by builders and site managers, this lintel combines structural reliability with improved thermal efficiency, making it a smart choice for internal openings requiring standard load support. Please note, lintels must be installed with proper bearing and support as detailed below.

Application

This box lintel is tailored for supporting internal structural openings such as doorways and window frames in solid walls that are 150mm wide, with wall thicknesses ranging from 100mm up to 215mm. The insulated ('INS') version incorporates thermal insulation within the lintel, helping to reduce heat loss through the opening and improve overall building performance. The perforated design along the lintel’s length provides a strong key for plaster, ensuring a neat finish. It is essential to bed the lintel on mortar with a minimum 150mm bearing at each end and to prop the lintel during construction to maintain safety and build speed.

Dimension

Length: 3150mm (10ft 4in)
Height: 215mm (8½in)
Width: 145mm (5¾in)
Suitable for walls 100-215mm thick

Material

Steel lintel with integrated thermal insulation
Perforated surface for plaster adhesion

Type

Box lintel for solid masonry walls
Standard duty load-bearing lintel
Insulated version for enhanced thermal properties

All lintels are manufactured in 150mm increments to suit different opening sizes. For precise installation guidance or technical support, please contact our sales office. Images are for illustration purposes only.

More Information

More Information
Type	Box Lintels
Loading	Standard Duty
Length	3150mm
Weight	53.540000
Manufacturer	Keystone
Sap Id	KBX15315INS

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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