100mm Steel Box Lintels for Internal Walls

100mm Steel Box Lintels – Internal Applications

This range of 100mm steel box lintels covers internal lintel requirements using products from established UK manufacturers Catnic, Stressline and Birtley. These box lintels are designed for use above doors and window openings where a consistent profile and reliable structural support are required.

A 100mm box lintel is widely used in internal wall construction for domestic and light commercial projects. The closed steel profile of a box lintel helps provide even load distribution while maintaining a neat soffit finish. Common box lintel sizes available include spans such as box lintel 2700 mm and box lintel 3600 mm, suitable for many standard internal openings.

Brands and Specifications

Catnic box lintel options include recognised products such as the Catnic BSD100, manufactured from galvanised steel to provide durability and resistance to corrosion. Stressline box lintels are produced to meet UK building standards and are suitable for a range of internal lintel applications. Birtley steel box lintels offer additional sizing and load capacity options, allowing flexibility when specifying lintels on site.

All steel box lintels shown are intended for internal use when correctly selected. Always refer to manufacturer load tables and sizing guidance to ensure the correct box lintel is specified for the wall type, span and imposed loads, in line with current building regulations.
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  • Box Lintel
    Wade Building Supplies 100mm Box Lintel | Standard Duty specification sheet Wade Building Supplies 600mm / stressline 100mm Box Lintel | Standard Duty
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    Stressline
    Stressline Standard Duty 100mm Box Lintel SL100BOX From £35.40 £29.50 (ex VAT)
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  • Box Lintel
    Wade Building Supplies 100mm Box Lintel | Heavy Duty specification duty loadings Wade Building Supplies 600mm / Stressline 100mm Box Lintel | Heavy Duty
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    Stressline
    Stressline Heavy Duty 100mm Box Lintels SL100BOXHD From £57.40 £47.83 (ex VAT)
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  • Box Lintel
    Wade Building Supplies 100mm Box Lintel | Extra Heavy Duty specification Wade Building Supplies 600mm / Stressline 100mm Box Lintel | Extra Heavy Duty
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    Stressline
    Stressline Extra Heavy Duty 100mm Box Lintel SL100BOXXHD From £110.40 £92.00 (ex VAT)
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  • Box Lintel
    Wade Building Supplies 100mm Box Lintel | Standard Duty fitting specification Wade Building Supplies - Standard Duty 100mm Box
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    Catnic
    Catnic BSD100 100mm Box Lintel From £53.40 £44.50 (ex VAT)
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  • Box Lintel
    Wade Building Supplies 100mm Box Lintel | Heavy Duty fitting diagram Wade Building Supplies 750mm / Catnic 100mm Box Lintel | Heavy Duty
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    Catnic
    Catnic Heavy Duty 100mm Box Lintel BHD100 From £58.40 £48.67 (ex VAT)
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  • Box Lintel
    Wade Building Supplies 100mm Box Lintel | Extra Heavy Duty loading diagram Wade Building Supplies 750mm / Catnic 100mm Box Lintel | Extra Heavy Duty
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    Catnic
    Catnic Extra Heavy Duty 100mm Box Lintel BXD100 From £95.40 £79.50 (ex VAT)
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Internal Door Lintels

All of these British-made internal wall lintels have a lower carbon footprint too as they are manufactured right here in the UK, so have fewer miles to cover before they arrive kerbside at your job.

In these days of Part L compliance, every little helps to make the British building industry as sustainable as possible.

Standard Duty Internal Lintels

When you require a standard-duty internal door steel lintel for your masonry wall there are three possible contenders, each of which is a good choice.

The Catnic BSD 100 comes in the manufacturer’s signature black powder coating and can be insulated within its core if required. Available from 900mm to 4800mm they are always available in stock.

The Stressline SL100BOX will provide good value for money and is available in a range of standard sizes up to 5100mm, for those wider openings.

Birtley makes a standard-duty steel internal wall/door lintel, the SB100 which is suitable for various tough conditions. It can take heavier loadings than other standard-duty steel lintels, which makes it a good, economic choice if you don’t need to go heavy-duty.

That said, always check load tables to ensure you order the correct duty lintel.

Heavy-Duty Internal Lintels

The Catnic BHD100 is a proper tough guy, capable of carrying a full wet masonry load without propping. When you have to make positive progress, then this is a top steel door lintel to choose for your internal wall.

Galvanised, and with powder-coated protection, it can also be used for external wall situations.

The Stressline SL100BOXHD internal steel lintel can be used at the eaves level when fully insulated and is a good lower-cost, high-performance selection.

Extra-Heavy-Duty Internal Lintels

The Catnic BDX100 will take on your most demanding loads up to 2700mm across an opening. These super-durable steel internal lintels are also designed to be reused as lintels and they are fully recyclable at the end of a building’s life.

The Stressline SL100BOXXHD range is made to order and requires a three-week lead-in from request to delivery. A good example of how you can profit from planning ahead!

If you require further advice, our expert team will be happy to help. Phone or email for help with specifications, ordering, and lead-in times, or to discuss logistics and potential delivery kerbside to your job.