What are Lag Shield Concrete Anchors? | Fasteners 101 

A note about lag shields, make sure to use the same brand lag bolt and lag shield. Mixing brands might lead to a mismatch in thread pitch, which is sub-optimal for how lag shields work. (Apologies if you've already mentioned this in the video, I forget!) A pro or con to lag shields is how wide they are. For example, a 1/4" lag bolt can work with either a 5/16" DuoPower anchor or a 1/2" wide lag shield. When I recently redid the fasteners holding the steel railing to my stone porch I ended up using a mix of both. For the holes where the old #14 screw came out cleanly, I hammer drilled to 5/16" and used the plastic anchor. For the holes where the #14 screw was rusted through and thus half remained inside, (EZ-outs failed, so) the only way I could get it out was with a 1/2" diamond hole saw; for those holes I used a lag shield.

Always blow out the concrete dust out of the drilled hole in the concrete before inserting the anchor or sacrifice some holding power. A simple rubber ball hand blower works great.

Great video 👍

great video. what is the best way to remove "frozen" lag bolts? I'm considering spraying a product like PB Blaster around the base of the screw but want to ensure this is something you would advise.

Could these be used with long lag screws where they stick out from the wall to hang a floating shelf on? Or do they need to be fully tightened down onto something?

Great video! Super helpful. Thank you. Question: How long should the lag shield be for a 3 in lag bolt?

Would these work for installing a mantel beam into faux stone facing?

Hi, would these work for installing a pull up bar into a concrete wall? If not could you recommend your best suggestion please??

Will this work for red brick? I’m installing a shelf for a fire place mantle

Could I use one of these lag shields to repair a stripped out lag screw hole in wood 2x4?

It tells you on the shield what size of hole to drill. Look for the little circle with the hole size in it.

Brick, perhaps porous: Best anchor type to use? Will Strike Anchor works on bricks since striking it expands the inserted/slipped in anchor?

Need the best concrete anchor for mounting a diving board base. I used 1/2" Lag shields- 3 in front & 3 in Back. Drilled 3/4" Holes. Tightened. With the up pressure of a 8 ft. board ; the 3 back ones pulled out on the third Dive. I was going tp use 3/4" Wedge anchors & use w/ Hilti Expoy for security ? Is this the best ?- Bruce

Great video, I need a little bit help knowing if this is what I need for my project. I want to hang a big frame is around 20 pounds heavy. It will go inside the house in the wall that has concrete. So is the concrete plus the drywall. Is the lag screw the best option. I want something that will hold more weight than what i have. I bought the cobra 253S, is 5/16''Lx2-1/4''. Thanks for your help.

Are these leg shields removable? I know the bull is obviously but is the shield itself also removable or will that shield stay in the concrete forever if the lag bolt is removed? Thanks

Do these work in cinder block concrete masonry units (CMUs) or should they only be used in regular concrete?

Thank you for this video I have a greenhouse with 2 cinderblock pillars wich i am installing a mini garage door i am building with wood and the pulleys for the spring cable will be fastened directly to the pillars the way I built the greenhouse.

Would these work in asphalt? If not, what would you recommend? What do transportation authorities use for anchoring road fixtures-- "cat eye" road reflectors for instance?

I want to put a half fence on top of a cinderblock wall. The cinder block wall has a layer of concrete on top. I want to mount a 2 x 6 "baseplate" for the fence frame. Should i use the lag shield or the double anchor? I am thinking to throw some epoxy in the hole also. Also the sides of the fence(about 16 ft length x 3 ft high) will be supported at each end

Would these be ok for a homemade tornado bed frame im planning on building a king size bed frame with 2×6 s and 3/4 inch plywood would these be good to lag the 2×6 to the concrete or would hammer drive fastener be better

Would those work on stucco or are they just for concrete?

Looking for something that can be permanent but reusable. For instance, I want to use a pop up canopy in my driveway when working on cars, so i need to anchor it down. Can't use stud type anchors because i don't want to be driving over pieces of metal sticking up out of the ground for obvious reasons. So i need something like an anchor well that I would leave in the ground, set up the canopy, bolt down and then be able to unbolt to take down the canopy and leave the wells until next time i need them. (Of course reinserting the bolts to ground level to keep debris out of them) Would these work for that purpose? Like a permanent anchor with intermittent use.

Aloha Bob, i was looking at using these to anchor a hurricane brace for my garage door. i didn't want bolts permanently sticking out of the garage floor. can the lag screw be removed and reinserted when needed without damaging the sleeve?

What would you use if you a have drywall,space,Then the concrete?

Can the lag screw in system be remove and reuse to mount/dismount objects repeatedly? Should 1/2 of the shield be epoxied in the concreted hole if the screw is to be removed/mounted repeatedly? TIA

Hi, perhaps I misunderstood but shouldn't I drill a hole that is slightly longer than the lag bolt instead of the length of the lag shield?

Once the lag screw is screwed in the lag shield, can you remove and re-screw the lag screw or this is a one time use? Thanks

I'm installing a 2×4. My shield is 1 1/2 but my screw is 3 1/2. 1/2 longer than I need. Can I still use it?

Will this work for fastening a Flag Pole to Brick? And do these Lag shields come in smaller diameters closer to 1/2"?

Can I use this for punching bag wall mount? Can it hold the weight of 100lb? I'm planning a cantilever wall mount.

Hello Sir, how to remove screws cut and stuck inside the lag shield?

Great video! Would this work on drywall? I'm trying to bolt a power rack in my garage, what would you suggest on a drywall application

How about hollowblock what kind of bolt should i use?

Are these good to attach burglar bars to concrete?

Good day... i dont know if this comment will be recognize... i use that bolt 3/8 in size i think... 14 of them on my loftbet 250cm long 170wide... do you think it will hold good enough? I use 7 on each side....

Can you use this in brick?

Will this work on stucco walls?

Is there a fastener for concrete flooring where you basically have a nut in the concrete that you can screw a bolt in/out of instead of a bolt sticking up our of the concrete? Not a one time use but where it can be use to attached tooling to a concrete floor but can be removed when not in use and at the same time does not present a tripping hazard? Any ideas?

can i use tapcons with these?

good use of rete gloves

You can use these in brick too can’t you?

Do you have one big enough for a cattle gate hardware? Will it be able to hold the weight of the gate?

Don't try to put too much torque on the lag bolt or you might break the head off. (guilty)

Do NOT use rotary drill, hole is too big for the lag shield. I have a 1/4" lag shield with 1/2" outside diameter. I used a 1/2" ROTARY drill bit (not hammer drill) but the hole was too big for the lag shield! Now i'll have to buy a hammer drill and bit and this just turned into a $200 project, oh man. :(