Will this hold a designer radiator 70KG without Water?

You’ll have to work out how many liters of water the radiator takes and add to the weight of the radiator. Also depends on number of screws/fixings needed as I believe the 250kg is between four.

Are these exactly the same as the 100mm, apart from the length? I have a dot dab wall which has been brought out quite far and tiled So need longer

As far as I know yes just longer screws maybe a different colour box, I used them to fix a thicker timber support to the concrete behind a 40mm kitchen wall. Only used a few so will likely get some 100mm screws to use with the rest of them as well.

Will these work on Celotex 50mm with 12.5mm plasterboard?

I have used these on dot and dab plasterboard on a blockwork wall but would not recommend for a plasterboard stud wall as the plug would not be supported for the full depth. For fixing to plasterboard alone I use a “steel hollow wall anchor”, Diall or Fischer are good brands. Good luck

Hi can these be used to fix insulated plasterboard to a brick wall?

Yes this is what they are made for.

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Corefix Connect 120mm Screw Heavy Duty Dot & Dab Wall Fixings - 24 Box

Product ID: 76563597

Details

Brand
COREFIX
Colour
Grey
Item weight
385 Grams
Material
Alloy Steel
Product dimensions
24W

🔩Steel core reinforcement for heavy loads

🛠️120mm length for deep anchoring

🏋️‍♂️Supports up to 100kg on 4 fixings

€ 58.32

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Description

🔧 Secure your space with steel-core strength — don’t let your walls hold you back!

HEAVY DUTY STEEL CORE - Patented steel core transfers load to solid blockwork, preventing plasterboard crushing.
DEEP 120 MM FIXING LENGTH - Designed to bridge plasterboard gaps and reach solid masonry for maximum hold.
UP TO 100 KG LOAD CAPACITY - Securely supports heavy items like TVs, radiators, and shelving with confidence.
UKAS TESTED MADE IN BRITAIN - Independently verified for safety and durability, trusted by pros nationwide.
EFFORTLESS 6 STEP INSTALLATION - No special tools needed—just drill, hammer, and screwdriver for a professional finish.

Corefix Connect 24-pack heavy-duty dot & dab wall fixings feature a patented steel core and 120mm length to transfer loads directly to blockwork behind plasterboard. Engineered for secure mounting of heavy fixtures up to 100kg on 4 fixings, these UK-made plugs offer easy installation with standard tools and have been independently tested for reliability. Ideal for millennial professionals seeking a no-fail solution to mount TVs, radiators, and shelving on challenging dot & dab walls.

Specifications

ASIN	B07B3XKGBZ
Best Sellers Rank	12,554 in DIY & Tools ( See Top 100 in DIY & Tools ) 46 in Plugs (DIY & Tools)
Brand Name	COREFIX
Colour	Grey
Country Of Origin	United Kingdom
Customer Reviews	4.6 4.6 out of 5 stars (507)
Item Dimensions W x H	24W millimetres
Item Weight	385 Grams
Manufacturer	Metex Online Ltd
Material Type	Alloy Steel
Number of Items	24

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