Hex flange thunderbolts with Elementech anti-corrosion coating, tested to 1,000 hours salt spray. Self-threading into pre-drilled masonry with no sleeve or plug needed. Through-fixing design speeds up installation and works close to edges without stress cracking.
Size
QTY
Price
QTY
M10 x 130mm
50
£32.93£39.52
M6 x 50mm
100
£13.56£16.27
M6 x 75mm
100
£16.92£20.30
M6 x 100mm
100
£19.91£23.89
m6 x 130mm
100
£27.93£33.52
m6 x 150mm
100
£31.16£37.39
These hex flange thunderbolts take a lot of the hassle out of masonry fixing. No sleeve, no plug, no re-positioning after marking — just drill a hole, drive the bolt in, and you’re done. The Elementech coating gives them serious anti-corrosion performance, salt spray tested to 1,000 hours, which puts them well ahead of plain zinc fixings for anything exposed to moisture or external conditions.
The flange head is worth a mention on its own. It acts as a built-in washer, spreading the load under the bolt head and reducing the risk of pull-through on softer substrates. That’s one less loose component rattling around in your bag, and a cleaner, more consistent bearing surface every time.
Where Hex Flange Thunderbolts Earn Their Keep
Close-to-edge fixing is where a lot of standard anchors start to struggle — you get cracking, spalling, or simply not enough material to grip into. The thread design on these bolts anchors along the full length of the fixing rather than just at the expansion point, which means load is distributed more evenly through the base material. Less stress concentration, less risk of blowout, more confidence that the fixing is going to hold.
Through-fixing capability is another practical advantage. Fix the bracket or fitting in place, drill through it and straight into the substrate, and drive the bolt home. You mark once, fix once. Anyone who has ever had to pull a bracket back off to re-drill a missed anchor point will appreciate this more than most.
Coating and Corrosion Resistance
The Elementech coating is a step up from standard electro-zinc. It’s designed for applications where basic protection isn’t enough — external steelwork, wet plant rooms, exposed structures, anywhere that sees regular damp or weather. At 1,000 hours salt spray tested, these are a sensible choice when longevity of the fixing matters as much as the initial installation. Worth specifying on jobs where call-backs for corroded fixings aren’t an option.
Pro Tip: When fixing close to an edge, aim for at least 1.5 times the bolt diameter as your minimum edge distance, even though these are designed for close-to-edge use, giving yourself a little extra margin keeps the substrate intact on older or lower-quality masonry.
Hex flange thunderbolts are used across general construction, groundworks, structural steelwork installation, mechanical and electrical fixing, and exterior cladding work. They perform well in solid concrete, engineering brick, and dense blockwork, and the thread design also allows them to grip in hollow block or brick where a standard expansion anchor would simply spin out. Common applications include fixing brackets, rails, frames, cable management systems, and structural timber connections to masonry substrates.
They suit both new build and refurbishment work. On a busy site they save time at every fixing point, and the through-fixing method is particularly useful where precise pre-marking is difficult or where access is limited.
Best For
Close-to-edge masonry fixing
Through-fixing applications
External and exposed environments
Structural bracket and frame installation
Cable management and mechanical fixing
Hollow block and brick substrates
Compatible Surfaces
Solid concrete
Engineering brickwork
Dense blockwork
Hollow block and brick
Most standard masonry substrates
Key Properties
Elementech coating: 1,000 hour salt spray tested
Self-threading: no sleeve or plug required
Flange head acts as integrated washer
Thread anchors along full fixing length
Through-fixing: mark once, fix once
Available in M6 and M10 diameters
Lengths from 50mm to 150mm
Not suitable for: Not suitable for fixings into timber, metal, or non-masonry substrates. Not recommended for safety-critical structural applications without engineer sign-off and relevant load data for the specific substrate.
Drill a hole to the correct diameter for the bolt size being used. Depth should match or slightly exceed the bolt length. Clear dust from the hole before inserting the bolt. Position your fitting or bracket, align with the hole, and drive the hex flange thunderbolt in using a suitable socket or spanner until the flange seats firmly against the surface.
No expansion setting is required. The self-threading action cuts into the masonry as the bolt is driven, creating the grip along the full length of the hole. Avoid over-torquing on hollow block or softer brick, as the material can shear if driven too hard. In most solid masonry, drive to firm resistance and stop.
Select the correct bolt length for your application, accounting for the thickness of any fitting being fixed through.
Drill a clean hole to the appropriate diameter for the bolt size, using a hammer drill and masonry bit.
Clear all dust and debris from the hole, a quick blow or vacuum prevents the thread binding on loose material.
Position the bracket, frame, or fitting over the hole.
Insert the hex flange thunderbolt through the fitting and into the hole.
Drive the bolt using a suitable hex socket and impact driver or wrench until the flange head seats firmly against the fixing surface.
Check the fitting is secure and the flange is bearing evenly on the substrate before applying any load.
Do I need to use a wall plug or sleeve with these thunderbolts?
No. These are self-threading fixings designed to cut directly into masonry. A sleeve or plug would actually interfere with how they work. Just drill the correct diameter hole, clear the dust, and drive the bolt straight in.
Are these suitable for fixing into hollow blocks or cavity brickwork?
Yes. Unlike standard expansion anchors that rely on compressing against the hole walls, hex flange thunderbolts anchor along the full thread length. This means they can get a grip even in hollow block where a conventional anchor would have little to hold on to.
How good is the Elementech coating for outdoor use?
It's tested to 1,000 hours salt spray resistance, which is significantly better than standard electro-zinc plating. For external fixings, exposed steelwork, or anything in a damp environment, the coating gives a meaningful improvement in longevity over basic zinc-plated alternatives.
These thunderbolts are manufactured from carbon steel with an Elementech anti-corrosion coating that has been independently salt spray tested to 1,000 hours. The hex flange head provides an integrated load-bearing face without the need for a separate washer. The thread profile is designed to cut into masonry substrates, forming a mechanical interlock along the full embedment depth. Available in M6 and M10 diameters across a range of lengths from 50mm to 150mm.
Material
Carbon steel
Coating
Elementech anti-corrosion
Salt Spray Resistance
1,000 hours
Head Type
Hex flange
Fixing Type
Self-threading through-fix
Available Diameters
M6, M10
Available Lengths
50mm, 75mm, 100mm, 130mm, 150mm
Box Quantity
50 or 100 depending on size
Weight
N/A
Size
M10 x 130mm, M6 x 100mm, m6 x 130mm, m6 x 150mm, M6 x 50mm, M6 x 75mm
Box Quantity
100, 50
Product Type
Hex Head Multi Purpose Thunderbolts
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