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Keystone BOX/K-150 Solid Wall Box Lintel 4350mm INS

SKU

KBX15435INS

£339.79 £283.16

Product Information

Keystone BOX/K-150 Solid Wall Box Lintel, 4350mm (14ft 3in) length for solid walls 100-215mm thick
Designed for standard duty loads, ideal for internal openings in masonry walls
Features built-in insulation for improved thermal efficiency ('INS' version)
Perforated design provides excellent plaster key for a secure finish
Requires minimum 150mm bearing each side, bedded on mortar; lintels must be propped during installation

Details

The Keystone BOX/K-150 Solid Wall Box Lintel 4350mm INS is a robust, insulated steel lintel tailored for internal openings in solid masonry walls between 100mm and 215mm thick. Designed specifically for builders and site managers working on serious projects, this lintel combines reliable structural support with enhanced thermal performance thanks to its integral insulation. Please note, lintels must be propped during installation to ensure safe load-bearing capacity.

Application

This lintel is primarily used to support brickwork or blockwork above doorways, window openings, and other internal wall penetrations where a standard duty load is required. Its box section with perforations allows plaster to key directly onto the lintel, creating a strong and seamless finish. The insulated version helps reduce thermal bridging in solid walls, making it a practical choice for energy-conscious builds and renovations.

Dimension

Length: 4350mm (14ft 3in)
Height: 215mm (8½in)
Width: 145mm (5¾in)
Suitable for wall thicknesses: 100-215mm (4-8½in)
Minimum end bearing: 150mm (6in) each side

Material

Galvanised steel with integrated insulation layer

Type

Box lintel for solid masonry walls

All Keystone BOX lintels are manufactured in 150mm increments to suit project requirements. For precise installation advice or technical support, please contact our sales team. Remember, lintels must be propped during installation to maintain structural integrity.

More Information

More Information
Type	Box Lintels
Loading	Standard Duty
Length	4350mm
Weight	73.930000
Manufacturer	Keystone
Sap Id	KBX15435INS

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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