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Keystone BOX/K-150 Solid Wall Box Lintel 3900mm INS

SKU

KBX1539INS

£265.07 £220.89

Product Information

Keystone BOX/K-150 Solid Wall Box Lintel, 3900mm (12ft 9in) length for solid walls 100-215mm thick.
Features built-in insulation for improved thermal efficiency on site.
Perforated design provides a strong plaster key for durable finishes.
Engineered to carry full wet masonry loads immediately after installation.
Minimum 150mm bearing each side required; lintels must be bedded on mortar and propped during construction.

Details

The Keystone BOX/K-150 Solid Wall Box Lintel, measuring 3900mm in length, is designed specifically for solid walls ranging from 100mm to 215mm thickness. Ideal for builders, contractors, and site managers, this insulated lintel version (INS) offers enhanced thermal performance, helping to meet modern building standards while providing reliable structural support for internal openings.

Please note: lintels require a minimum end bearing of 150mm on each side and must be bedded on mortar. Propping is recommended to maintain structural integrity during construction.

Application

This box lintel is suited for standard-duty load-bearing scenarios within solid masonry walls. Its perforated surface creates an excellent plaster key, ensuring a secure finish and helping tradespeople deliver a professional installation. The insulated core improves energy efficiency without compromising strength, making it a practical choice for both new builds and renovations requiring compliance with thermal regulations.

Dimension

Length: 3900mm (12ft 9in)
Height: 215mm
Width: 145mm
Suitable for wall thickness: 100-215mm

Material

Steel with integrated insulation core

Type

Box lintel designed for solid wall construction

More Information

More Information
Type	Box Lintels
Loading	Standard Duty
Length	3900mm
Weight	66.280000
Manufacturer	Keystone
Sap Id	KBX1539INS

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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