Rock-Solid Brick & Concrete Hold Without Spin-Outs.
Stop fighting snapped blue screws, brick-cracking metal sleeve bolts, and flimsy freebie plugs.
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Every millimeter of the Cosari BrickLock 8x40 is molded to grip irregular brick and concrete bores on the first turn of your driver.
Provides a rigid 1.75mm overhang lip around your 8mm hole, covering minor drill spalling and preventing the anchor from pushing into hollow brick perforations.
Two opposing side fins wedge directly into the masonry wall as you tap the plug in, stopping annoying spin-outs before the screw even reaches full depth.
Sawtooth barbed ribbing along the 40mm barrel locks into microscopic brick and concrete pores under radial compression for up to 240 lbs of tension resistance.
The tapered closed tip guides #10–#12 screws straight down the 28mm expansion slit, while embossed Ø8x40 fin markings take the guesswork out of bit selection.
Slide the tapered closed tip into a clean 8mm (5/16") masonry bore and tap lightly until the 11.5mm flat flanged collar sits square and flush against the brick face.
As your #10–#12 screw enters the collar, the two opposing side wing fins embossed with Ø8x40 brace against the bore walls so the plug refuses to spin.
The screw threads down the centered closed tip, forcing the 28mm vertical slits and 4 notched barbs outward into the brick without cracking the masonry surface.
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Architectural Ø8x40mm Collared Virgin Nylon Masonry Expansion Anchors for Solid Brick, Perforated Brick & Concrete
Backed by our 30-Day Money-Back Trial & Full Cosari Guarantee.
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Why Virgin PA6 Nylon Outperforms Metal Bolts in Brick: Steel sleeve anchors ('dynabolts') and brittle blue masonry screws were designed for poured industrial concrete floors—not residential clay brick. In face brick or cored brick, rigid metal concentrates stress at a single point, cracking the brick face or stripping out dusty holes. Cosari's high-density matte light-gray virgin PA6 nylon conforms under screw compression into natural masonry irregularities, locking tight without fracturing the wall.
Sizing, Drill Bit & Screw Compatibility: Each Cosari BrickLock 8x40 measures Ø8mm in outer barrel diameter by 40mm in embedment length with an 11.5mm flat flanged collar. Drill a 45mm-deep hole using a standard 8mm or 5/16-inch carbide masonry bit, blow out the dust, and drive any customer-supplied #10 to #12 (4.5mm–6.0mm) wood, pan-head, or hex-lag screw matched to your fixture thickness.
Indoor & Outdoor Applications: Engineered for solid clay brick, perforated/cored brick, poured concrete condo walls, concrete block, and natural stone across temperatures from -40°F to +176°F (-40°C to +80°C). Ideal for fireplace OLED TV mounts, kitchen wall cabinets, heavy garage shelving, porch post brackets, hose reels, and exterior security lighting.
Free 5–7 Day US Shipping: Every order ships free with full tracking and delivers in 5 to 7 business days.
30-Day Trial: Try it at home for 30 days risk-free. Need help? Email us anytime at support@buycosari.com.
2-Year Warranty: If anything goes wrong within 2 years, we replace it free of charge or refund your order in full.
Spreads radial expansion across 40mm of virgin PA6 nylon so you never pop or fracture expensive fireplace or exterior face brick.
100% virgin polyamide 6 resists sub-zero outdoor freeze-thaw cycles, chimney heat, damp basement humidity, and UV aging.
Four deep-cut sawtooth barbs and a closed centering tip keep heavy TV arms, cabinets, and ledger brackets rock-solid for decades.
Cosari BrickLock 8x40Standard Competitors
| Feature | Cosari BrickLock 8x40 | Standard Competitors |
|---|---|---|
| Flush Collar Prevents Falling Into Hollow Brick | Yes (11.5mm Flat Flanged Collar) | No (Sinks Into Perforations) |
| Anti-Spin Lock on Initial Screw Bite | Dual Opposing Wing Fins + 4 Barbs | Spins in Dusty Brick Holes |
| Safe for Brittle & Historic Clay Face Brick | Gentle 2-Way Nylon Compression | Cracks Brick or Strips Threads |
| Permanent Drill-Bit Size Marking on Anchor | Embossed 'Ø8x40' & Screw Icon | Unmarked (Guesswork Later) |
| Outdoor Freeze & Chimney Heat Rating | -40°F to +176°F Virgin PA6 Nylon | Brittle Recycled Polystyrene |
Swipe left for steps 2 and 3
Using an 8mm (or 5/16") carbide masonry bit, drill 45mm deep into solid brick or concrete and brush or blow out the loose red dust.
Push the tapered closed tip into the hole and tap lightly with a hammer until the 11.5mm flat flanged collar seats dead-flush against the wall.
Position your bracket and drive a #10–#12 wood or lag screw through the collar—the side fins stop spin-outs while the 4 notched ribs lock tight.
Mounted our living room TV bracket into solid brick. Drilled clean 8mm holes, tapped the light-gray Ø8x40mm plugs in to the flanged collars, then drove my lag screws. Everything seated straight and held great.
Used these for heavy shelving along my garage's concrete wall. The ribbed plugs tapped in snug and stayed put while I tightened the screws. Much cleaner and more secure than the loose anchors I replaced.
Drill an 8mm hole, tap the tapered closed tip in and run your screw. The notched ribbing grabs tight right away. Simple, fast and strong.
Just what I needed for mounting patio lights along our concrete curb. The gray plugs installed easily, and exterior stainless screws tightened into them nicely. The fixtures have stayed secure through wind and rain.
Used these 8x40 collared wall plugs for brackets around a post on my back porch. I supplied the screws, and the little anti-rotation fins kept each plug from spinning while I tightened everything down.
Excellent quality plugs for brackets on an outdoor project against a concrete footing. The molding is clean, the Ø8x40 marking is easy to read, and each one had a snug hammer-in fit in my 8mm holes.
Used these while installing kitchen cabinets on our condo's shared concrete wall. I marked the hanging rail, drilled 8mm holes, tapped the flanged plugs flush, then drove the mounting screws. The cabinets feel strong and secure.
Great little 10-pack for jobs in concrete or brick. The Ø8x40 marking on the side makes it easy to confirm the size before grabbing the masonry bit.
I avoid metal dynabolts in face brick because they can slip or crack it. These expand more gently through the vertical slits, and the flat collar keeps the plug from disappearing into a perforation. Smart design.
I am done fighting blue masonry screws that strip or snap. With these, I drilled a clean 8mm hole, tapped the tapered end flush to the collar and used regular pan-head screws. Way less aggravation.
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Use an 8mm carbide-tipped masonry drill bit (or a standard 5/16-inch US masonry bit, which measures 7.94mm and gives an ideal snug press-fit). Drill your hole at least 45mm (1-3/4 inches) deep so the 40mm anchor seats completely flush to its collar.
Screws are not included because fixture thicknesses vary widely from thin steel TV brackets to thick timber ledger boards. Use any standard #10 to #12 (4.5mm to 6.0mm diameter) wood screw, pan-head screw, or hex-lag screw. Choose a screw length equal to your bracket thickness plus 45mm.
No. Unlike cheap uncollared plugs that drop straight into internal brick cavities, the Cosari BrickLock 8x40 is molded with an 11.5mm flat flanged collar that stops dead-flush against the outer brick face.
The tapered closed tip serves two functions: first, it allows the anchor to slide smoothly into the 8mm bore without catching on rough masonry edges; second, it keeps the screw point centered along the 28mm vertical expansion slit so the screw cannot veer off to one side inside the hole.
Yes. Each anchor is injection-molded from 100% virgin PA6 structural nylon rated from -40°F to +176°F (-40°C to +80°C). Unlike cheap polystyrene plugs that turn brittle in sub-zero weather, it stays tough year-round—just pair it with exterior-grade stainless or coated screws.
Put the Cosari BrickLock 8x40 to the test on your brick or concrete project for 30 days. If a single anchor spins out, slips backward, or fails to deliver a confidence-inspiring hold, contact our support team for a full 100% refund—plus every order is covered by our 2-Year Structural Replacement Warranty.