M8 x 40mm loose bolt shield anchors, sold in boxes of 100. A reliable sleeve anchor for solid masonry, concrete and blockwork. Full range of sizes available — call us for the best trade prices in the UK.
Loose bolt shield anchors are one of the most straightforward fixings you will reach for on site, and for good reason. This M8 x 40mm size covers a good range of everyday fixing tasks into solid masonry, concrete and dense blockwork. The loose bolt design means the bolt is separate from the anchor body, so you drop the sleeve into the drilled hole first and tighten from the front once your fixture is in position. Simpler to fit than you might expect, and the expansion principle means the anchor grips harder the more load is applied.
Where Loose Bolt Shield Anchors Get Used
On most building sites these will be found fixing timber plates, steel brackets, handrails, cable trays, gate posts and plant equipment to concrete or brick. The M8 thread handles a solid working load without being overkill for typical structural attachments. Box quantity of 100 means you are not running to the merchant every other day on a bigger job, which is exactly how trade fixings should be supplied.
The loose bolt configuration suits situations where the fixture needs to be held in place before the bolt is inserted and tightened. You position your bracket, drop the bolt through, thread it into the expanded anchor body, and tighten up. No fiddling around trying to locate a pre-assembled anchor through a hole at an awkward angle. Anyone who has tried to do that with a one-piece anchor up a ladder will appreciate the difference.
We stock a full range of shield anchor sizes beyond this M8 x 40mm listing. If you need a different diameter or length in quantity, give us a call and we will sort out the best price. Buying in bulk is where the real savings are, and loose bolt shield anchors are the sort of consumable fixing that disappears fast on active sites. Stocking up makes sense.
Pro Tip: Always clear the hole of dust before inserting the anchor sleeve, a quick blast of compressed air makes a real difference to how well the anchor sets and holds under load.
Shield anchors in M8 x 40mm are used across a wide range of general construction and installation tasks. Common applications include fixing steel brackets, timber sole plates, cable management systems, handrail posts and mezzanine supports into concrete floors, brick walls and dense blockwork. They are regularly specified by groundworkers, steel fixers, electrical contractors and general builders where a reliable, load-bearing masonry fixing is needed without the complexity of chemical anchoring systems.
Best For
Steel bracket fixing to concrete
Handrail and balustrade posts
Cable tray and containment supports
Timber plates and sole plates
Gate post fixing
Plant and equipment mounting
Compatible Materials
Solid concrete
Brick masonry
Dense blockwork
Stone
Key Specifications
Thread size: M8
Length: 40mm
Type: Sleeve anchor, loose bolt
Box quantity: 100
Requires 10mm drill bit (standard for M8 shield anchor)
Not suitable for: Not suitable for hollow block, aerated concrete (such as Thermalite or Aircrete), or any soft or friable masonry where the anchor cannot fully expand and grip. Do not use in dynamic or vibration-heavy applications without checking manufacturer load ratings.
Drill a 10mm diameter hole to the required depth in the base material, making sure the hole is clean and free of dust. Feed the anchor sleeve into the hole flush with or just below the surface. Locate your fixture over the hole, insert the bolt through the fixture and into the anchor sleeve, then tighten with a spanner or socket until the sleeve fully expands and the fixture is held firm.
Mark and drill a 10mm hole to the correct depth using a hammer drill and masonry bit
Clear dust and debris from the hole using compressed air or a blowout pump
Insert the anchor sleeve into the hole, tapping flush if needed
Position your fixture over the hole and insert the M8 bolt through the fixing point
Thread the bolt into the anchor sleeve by hand until resistance is felt
Tighten with a spanner or socket wrench until the anchor expands fully and the fixture is secure
What drill bit size do I need for M8 x 40mm shield anchors?
You need a 10mm masonry drill bit for M8 shield anchors. Drill depth should be at least equal to the anchor length plus a few millimetres to ensure the sleeve can fully expand without bottoming out before the bolt is tightened.
Can I get these loose bolt shield anchors in other sizes?
Yes, we stock a full range of shield anchor sizes. If you need a different diameter or length, give us a call and we can discuss pricing, especially for larger quantities where the bulk savings are worth having.
Shield anchors of the loose bolt type work on a mechanical expansion principle. As the bolt is tightened, it draws the cone-shaped end of the anchor body upward through the split sleeve, forcing the sleeve to expand outward against the walls of the drilled hole. The result is a positive mechanical lock that increases grip under load. Typically manufactured from zinc-plated carbon steel, offering reasonable corrosion resistance for internal and sheltered external applications.
Thread Size
M8
Anchor Length
40mm
Anchor Type
Loose bolt sleeve anchor
Drill Bit Required
10mm
Box Quantity
100
Material
Zinc-plated carbon steel (typical)
Base Material
Solid concrete, brick, dense blockwork, stone
Product Type
Sleeve Anchors (Projection Bolts)
Size
m8 x 40
Box Quantity
100
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