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Quick Order
Overview
Use for a tight grip! Larger teeth give increased holding strength, ideal for end grain and particle board applications. Made of die cast zinc alloy. Has a self tapping harpoon thread. Thread listed is the size of the internal thread size.
What's included
(1) Pack of Hex Drive Threaded Inserts
Technical Details
Technical Downloads
Questions and Answers
Do not include HTML, links, references to other stores, pricing or contact info.
My question is about:

If your question is about more than one item, click + to add them.

Browse 9 questions
Browse 9 questions
and 63 answers
Why did you choose this?
Rockler Store
it's what I needed
Larry B
on Apr 5, 2018
I broke one of these trying to install it with the ice cream scoop kit.
garrett g
on Mar 24, 2018
It matched the exact size that I needed to replace.
Christopher Y
on Mar 12, 2018
i have gotten them from you befor
kitchen chair repairs, one size up from originals
kitchen chair repairs, one size up from originals
kent l
on Feb 17, 2018
I will be using this in conjunction with the Connector Bolts from Rockler for knock-down furniture.
Shashwat P
on Feb 14, 2018
My husband needs it to build a bed frame that was in his wood magazine.
Cindy V
on Jan 28, 2018
love the hex drive since it is much easier to use a power drill to drive them in straight
Larry W
on Nov 17, 2017
USE THEM ALL THE TIME. BEST QUALITY AND FUNCTION
Pedro F
on Jul 19, 2017
needed to repair loose legs on dining chairs
Mike M
on Apr 25, 2017
to secure the legs
STEVE L
on Jan 13, 2017
Part needed
Thomas D
on Dec 31, 2016
poor quality - they blew out and cracked when I tried to install them
EarlS
on Nov 18, 2016
I bought these to hold parts of a bed, I am building, together to aid in disassembling when it has to be moved.
Stanley G
on Oct 25, 2016
outstanding in construction of outdoor furniture. Sturdy and easy to install
Patrick D
on Jun 30, 2016
need it for speaker stand
RANDY J
on Apr 1, 2016
for the bean bag game I make
Bruce M
on Mar 1, 2016
Needed for a project.
Ron S
on Jan 27, 2016
to repair chairs
ralph c
on Jan 3, 2016
Making jigs.
Robert G
on Jan 1, 2016
i needed new ones 2 replace the broken. also near impossible 2 find locally
tom p
on Dec 2, 2015
pull knobs
Wade M
on Nov 15, 2015
Needed to complete a project.
James C
on Sep 27, 2015
I'm building a modular toy train layout which I tell myself is for the grand children. These threaded inserts will become the receiver for 5/15" x 18 appliance bolts to be used as leveling devices. Appliance bolts were about 1/5 the price of commercial leveling devices. These hex threaded inserts are perfect for the job.
John H
on Sep 2, 2015
Needed them
El Guapo
on Jul 10, 2015
because I know what to order
John B
on Jun 22, 2015
it's what I needed
Larry B
on Apr 5, 2018
need
tom p
on Apr 1, 2018
I broke one of these trying to install it with the ice cream scoop kit.
garrett g
on Mar 24, 2018
Works great! Easy to install.
Chuck D
on Mar 21, 2018
It matched the exact size that I needed to replace.
Christopher Y
on Mar 12, 2018
Same as above
Don P
on Feb 20, 2018
i have gotten them from you befor
kitchen chair repairs, one size up from originals
kitchen chair repairs, one size up from originals
kent l
on Feb 17, 2018
I tried the ones that you insert with a flat head screw driver but they break. I have always liked
the hex drive and you are only ones that have them.
the hex drive and you are only ones that have them.
Robert L
on Feb 16, 2018
I will be using this in conjunction with the Connector Bolts from Rockler for knock-down furniture.
Shashwat P
on Feb 14, 2018
putting in end grain
Vernon M
on Jan 30, 2018
My husband needs it to build a bed frame that was in his wood magazine.
Cindy V
on Jan 28, 2018
Ran out,needed for various jigs that I use
Edwin H. Ferguson J
on Jan 22, 2018
love the hex drive since it is much easier to use a power drill to drive them in straight
Larry W
on Nov 17, 2017
I have a piece of furniture where one of these items failed, so I need to replace it.
Edward S
on Aug 11, 2017
USE THEM ALL THE TIME. BEST QUALITY AND FUNCTION
Pedro F
on Jul 19, 2017
Home project
James G
on Jun 4, 2017
needed to repair loose legs on dining chairs
Mike M
on Apr 25, 2017
Because you didn't have 3/8" in stock...
David W
on Jan 25, 2017
to secure the legs
STEVE L
on Jan 13, 2017
Loose legs on dinning room chairs
Danny S
on Jan 9, 2017
Part needed
Thomas D
on Dec 31, 2016
easy to thread in with the hex drive
Jon M
on Dec 15, 2016
poor quality - they blew out and cracked when I tried to install them
EarlS
on Nov 18, 2016
To turn seasonal handles for cheese knife kit, I have that kind of wife
Jeffrey D
on Nov 8, 2016
I bought these to hold parts of a bed, I am building, together to aid in disassembling when it has to be moved.
Stanley G
on Oct 25, 2016
Recommended in the plans I purchased and not available locally.
Tom P
on Jul 24, 2016
outstanding in construction of outdoor furniture. Sturdy and easy to install
Patrick D
on Jun 30, 2016
I needed them to fix a chair
Thomas C H
on Apr 10, 2016
need it for speaker stand
RANDY J
on Apr 1, 2016
building a quilt ladder
Ronald D
on Mar 13, 2016
for the bean bag game I make
Bruce M
on Mar 1, 2016
Project
Ron O
on Feb 26, 2016
Needed for a project.
Ron S
on Jan 27, 2016
They work perfectly for my applications when building collapsable display stands
Gill W
on Jan 8, 2016
to repair chairs
ralph c
on Jan 3, 2016
Making table legs and this item is similar to the existing ones
Kenneth K
on Jan 3, 2016
Making jigs.
Robert G
on Jan 1, 2016
Needed this size.
James L
on Dec 19, 2015
i needed new ones 2 replace the broken. also near impossible 2 find locally
tom p
on Dec 2, 2015
For a furniture prototype.
Kim L
on Nov 24, 2015
pull knobs
Wade M
on Nov 15, 2015
To make a take down quilt rack
Patrick C
on Oct 15, 2015
Needed to complete a project.
James C
on Sep 27, 2015
needed for inventory
Bob G
on Sep 12, 2015
I'm building a modular toy train layout which I tell myself is for the grand children. These threaded inserts will become the receiver for 5/15" x 18 appliance bolts to be used as leveling devices. Appliance bolts were about 1/5 the price of commercial leveling devices. These hex threaded inserts are perfect for the job.
John H
on Sep 2, 2015
Repair a broken chair
Delia C
on Jul 25, 2015
Needed them
El Guapo
on Jul 10, 2015
plans called for these
Dave P
on Jun 29, 2015
because I know what to order
John B
on Jun 22, 2015
Best way I found to incorporate adjustable feet on tables. Also use them to assemble projects such as a custom bed frame so it can be taken apart prior to a move.
Dennis D
on Jun 5, 2015
need
tom p
on Apr 1, 2018
Works great! Easy to install.
Chuck D
on Mar 21, 2018
Same as above
Don P
on Feb 20, 2018
I tried the ones that you insert with a flat head screw driver but they break. I have always liked
the hex drive and you are only ones that have them.
the hex drive and you are only ones that have them.
Robert L
on Feb 16, 2018
putting in end grain
Vernon M
on Jan 30, 2018
Ran out,needed for various jigs that I use
Edwin H. Ferguson J
on Jan 22, 2018
I have a piece of furniture where one of these items failed, so I need to replace it.
Edward S
on Aug 11, 2017
Home project
James G
on Jun 4, 2017
Because you didn't have 3/8" in stock...
David W
on Jan 25, 2017
Loose legs on dinning room chairs
Danny S
on Jan 9, 2017
easy to thread in with the hex drive
Jon M
on Dec 15, 2016
To turn seasonal handles for cheese knife kit, I have that kind of wife
Jeffrey D
on Nov 8, 2016
Recommended in the plans I purchased and not available locally.
Tom P
on Jul 24, 2016
I needed them to fix a chair
Thomas C H
on Apr 10, 2016
building a quilt ladder
Ronald D
on Mar 13, 2016
Project
Ron O
on Feb 26, 2016
They work perfectly for my applications when building collapsable display stands
Gill W
on Jan 8, 2016
Making table legs and this item is similar to the existing ones
Kenneth K
on Jan 3, 2016
Needed this size.
James L
on Dec 19, 2015
For a furniture prototype.
Kim L
on Nov 24, 2015
To make a take down quilt rack
Patrick C
on Oct 15, 2015
needed for inventory
Bob G
on Sep 12, 2015
Repair a broken chair
Delia C
on Jul 25, 2015
plans called for these
Dave P
on Jun 29, 2015
Best way I found to incorporate adjustable feet on tables. Also use them to assemble projects such as a custom bed frame so it can be taken apart prior to a move.
Dennis D
on Jun 5, 2015
how deep are the internal threads? how long is the overall length of the insert?
A shopper
on Aug 5, 2015
BEST ANSWER: The threads go all the through. This is not a blind insert. Overall length is 13/16"
- Reply
- Inaccurate
- Steve Staff on Aug 6, 2015
BEST ANSWER: The threads go all the through. This is not a blind insert. Overall length is 13/16"
- Reply
- Inaccurate
- Steve Staff on Aug 6, 2015
Vote for the best answer above!
Best threaded insert to use in 3/4 plywood edge to draw edge into a dado and then be able to take apart and reassemble?
Stewart O
on May 9, 2015
BEST ANSWER: If you are talking about inserting these into the edge of the plywood that you will insert into a dado, I would not recommend it. They work by forcing themselves into a hole intentionally drilled too small. That's so that they can mash (as opposed to cut) the necessary threads they need for their holding power. This very action will split apart your plywood. These things work very well for their intended use, in the flat side of a piece of wood, even plyood.
- Reply
- Inaccurate
- SKIP T on May 18, 2015
- Purchased on Jan 23, 2015
BEST ANSWER: If you are talking about inserting these into the edge of the plywood that you will insert into a dado, I would not recommend it. They work by forcing themselves into a hole intentionally drilled too small. That's so that they can mash (as opposed to cut) the necessary threads they need for their holding power. This very action will split apart your plywood. These things work very well for their intended use, in the flat side of a piece of wood, even plyood.
- Reply
- Inaccurate
- SKIP T on May 18, 2015
- Purchased on Jan 23, 2015
The 1/4 -20 would be my preferred size to use with 3/4 inch plywood because a larger size may cause the lamination to separate
- Reply
- Inaccurate
- Gill W on May 9, 2015
- Purchased on Apr 16, 2015
not sure I installed them in solid wood, plywood may not be suitable.
- Reply
- Inaccurate
- WILLIAM F on May 10, 2015
- Purchased on Apr 2, 2015
Vote for the best answer above!
what can i use to thead dowels and the corresponding hole?
A shopper
on Aug 19, 2015
BEST ANSWER: To join dowels, I always use the threaded insert with steel hanger bolts. One dowel gets the insert and the corresponding dowel gets the steel hanger bolt and screw the dowels together. Note: be sure to find the center of each dowel before inserting the hardware.
- Reply
- Inaccurate
- Gill W on Aug 19, 2015
- Purchased on Apr 16, 2015

Steel Hanger Bolts-Steel Hanger Bolts
BEST ANSWER: To join dowels, I always use the threaded insert with steel hanger bolts. One dowel gets the insert and the corresponding dowel gets the steel hanger bolt and screw the dowels together. Note: be sure to find the center of each dowel before inserting the hardware.
- Reply
- Inaccurate
- Gill W on Aug 19, 2015
- Purchased on Apr 16, 2015

Steel Hanger Bolts-Steel Hanger Bolts
Vote for the best answer above!
What is recommend hole diameter for the 5/16-18 in hardwood like oak, maple, or walnut?
Mike F
on Apr 11, 2016
BEST ANSWER: I wouldn't use this in a hardwood. It is tapered, and a hardwood has little or no give. Rockler has other options where the shaft is straight.
- Reply
- Inaccurate
- Home Smither on Apr 11, 2016
- Purchased on Apr 4, 2015
BEST ANSWER: I wouldn't use this in a hardwood. It is tapered, and a hardwood has little or no give. Rockler has other options where the shaft is straight.
- Reply
- Inaccurate
- Home Smither on Apr 11, 2016
- Purchased on Apr 4, 2015
Vote for the best answer above!
what hole size is required for the 1/4"-20 insert and how deep should the hole be drilled?
Matt T
on Jun 24, 2016
BEST ANSWER: For softwoods, 11/32" is recommended, for hardwoods 3/8" is recommended.An 11/32" drill bit is hard to find. Not a standard size.
The hole depth depends upon the connector bolt length. Subtract the thickness of the wood being attached from the connector bolt length, & I add 1/4" to that number to keep from bottoming out.
The hole depth depends upon the connector bolt length. Subtract the thickness of the wood being attached from the connector bolt length, & I add 1/4" to that number to keep from bottoming out.
- Reply
- Inaccurate
- Charles M on Jun 25, 2016
- Purchased on Apr 19, 2015
BEST ANSWER: For softwoods, 11/32" is recommended, for hardwoods 3/8" is recommended.An 11/32" drill bit is hard to find. Not a standard size.
The hole depth depends upon the connector bolt length. Subtract the thickness of the wood being attached from the connector bolt length, & I add 1/4" to that number to keep from bottoming out.
The hole depth depends upon the connector bolt length. Subtract the thickness of the wood being attached from the connector bolt length, & I add 1/4" to that number to keep from bottoming out.
- Reply
- Inaccurate
- Charles M on Jun 25, 2016
- Purchased on Apr 19, 2015
1/2" in softwood, 7/16" in hardwood. These are good starting places drill a hole in as piece of scrap and try it. If you are carefully you can back the insert out to save for use. Also if you are using these for something that is going to be taken appart you should consider gluing the insert in, also pay attention to the material the screws are made from dissimilar metal corrosion could be a problem.
- Reply
- Inaccurate
- L O on Jun 24, 2016
- Purchased on May 3, 2015
As suggested, use 1/2 inch for hardwood, and 7/16 inch for softer wood. If you are using the Rockler bottle opener, ice cream scoops, or pizza cutters with the inserts, drill 1 1/8 inch deep. This will allow for the length of the tool being inserted. Install the insert about 1/16 inch below the edge of the wood. Good luck.
H
H
- Reply
- Inaccurate
- HARRY C on Jun 25, 2016
- Purchased on Apr 1, 2015
Vote for the best answer above!
What is recommend hole diameter for the 5/16-18 in soft wood?
Fran B
on Feb 13, 2017
BEST ANSWER: 7/16 in soft wood, 1/2 in hard; use a drop of CA glue when final inserting, works well for me.
- Reply
- Inaccurate
- HARRY C on Feb 13, 2017
- Purchased on Apr 1, 2015
BEST ANSWER: 7/16 in soft wood, 1/2 in hard; use a drop of CA glue when final inserting, works well for me.
- Reply
- Inaccurate
- HARRY C on Feb 13, 2017
- Purchased on Apr 1, 2015
I don't remember. Take a piece of scrap wood and drill some holes until you find the right size. Be aware that if you insert this near the end of a piece of lumber and the hole is too tight, you can split the wood.
- Reply
- Inaccurate
- Home Smither on Feb 13, 2017
- Purchased on Apr 4, 2015
Vote for the best answer above!
Vote for the best answer above!
I need to purchase some of these. the ones I removed required a 5/16 hex head allen wrench. Is this, then, the size I need to buy as a replacement?
Joe F
on Oct 24, 2017
Reviews
4.2 / 5.0
37 Reviews
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USED TO ADD DIFFERENT USEFULL THINGS TO MY WORK BENCH.
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I like the length
For what I used them, which was putting a bolt in some 3/4" boards, they worked great. I really like the longer length. There was so much more thread. The whole project seems sturdier. They could be a problem in a much thinner board, but I rarely use them in less than 3/4" anyway.
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Excellent product and works as advertised in an end grain application. However, the supplied installation sheet needs the table revising to clearly show the correct drill sizes for softwood / hardwood applications.
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metal threaded inserts
They are very useful for take apart & reassemble Furniture such as back Paneling of A desk the center panels of A desk that has 2 cases of drawers & a chair opening in center,The panels at the back of the Chair opening need to be assembled with threaded inserts on right & left side so it can be carried to the customers house in 3 peices & reassembled in the house so it will go through all interior doors.
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Threaded Inserts
It works perfect. The set of chairs is back to normal.
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These hex drive threaded inserts worked better than the original ones that I replaced. Much heavier duty so I didn't even have to re-drill the holes.
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very exact and tight fitting
very exact and tight fitting
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Wonderful Product
This product was exactly what I needed to build a knock-down book shelf. I had bought some salvaged fronts from built-in closets and need to build a large frame. Since the finished bookcase would be too heavy and bulky to easily move from room-to-room - I opted to build a knock-down version. These inserts were the perfect solution.
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Threaded Ibserts
Boght 40 for floor leveler a for modular train table. Worked perfectly.
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excellant
easy to install & v. strong providing you dont over- boar the hole
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Did the job as advertised.
I build "retro-industrial" furniture and use these in the bottoms of plank table tops to attach leg structures to the tops. Rather than simply running wood screws into the top, these allow the use of machine screws that can be installed and removed numerous times without tearing out of stripping wood-screw holes. Especially useful for any application where things need to be taken apart and reassembled occasionally.
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Great repair product
Easy to use if you know what you are doing. I repaired two out of the five feet of my ottoman and they are sturdier than the originals.
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Works very well in Hard woods when others do not. recommend using it on cherry,maple,oak, et.al.
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Have a futon with wooden arms...
Have a futon with wooden arms with magazine holders. The original threaded inserts which held the futon frame to the arms were so thin they cracked and the bolts literally pulled out and the frame collapsed. After several failed attempts at repair I bought these tapered hex inserts for 5/16" bolts. With a 1/2" pilot holes these worked well and the futon is better than new.
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April 10, 2013
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The secret with these inserts is...
The secret with these inserts is using the correct size pilot hole. My suggestion is that you test fit an insert into a scrap of the wood you are using to make sure you find the right size pilot hole that will allow the insert to be put in place without too much resistance that the insert breaks or you split your workpiece. Also, I put these inserts in by hand using a double nuted bolt that I screw all the way into the insert and then lock the bolt with a double nut and use a small socket and ratchet to drive it in place. You will not break the insert this way. If you are trying to drive these inserts with a power drill you are asking for trouble.
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June 13, 2012
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Worked perfectly. I can't understand why...
Worked perfectly. I can't understand why others had trouble, because these were so easy to install: Drill a hole; Put a hex drive on a socket wrench; Turn.I've used the 1/4" size in Maple and Red Oak--both end grain--with absolutely no resistance, breakage, splitting, etc. And they hold tight, unlike some of the T-nut options out there.I used a 7/16" bit for both, but if you simply read the back of the package, the suggested bit sizes are listed for hardwood or softwood applications. A 15/32" bit is recommended for hardwood (NOT a 3/8" hole, as others mentioned). I always start with a smaller hole first, however, because you can make a hole bigger, but not smaller! The 7/16" hole worked on the first test--held fast, and the insert went in with no more torque than needed to run a machine screw.Great item.
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November 18, 2009
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I used the inserts to repair...
I used the inserts to repair 33 office chairs that had been delivered and set up by a vendor. The people who assembled and installed the previous inserts did not tighten them even hand tight. When I was called upon, months later, to repair the chairs, I used your inserts which were slightly larger and therefore were a perfect fit for the project. I used an 8mm Allen driver in a half-inch driver drill to drive and torque the bolts. Perfect solution to a problem that could have been prevented, but wasn't.
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April 20, 2009
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Worked extremely well in end grain....
Worked extremely well in end grain. Used the recommended bit size and a 3/8 drive hex metric socket, 3' extension and ratchet handle. Used parafin to lube threads before installing. Very easy and smooth install.
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November 23, 2008
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i like these treaded inserts but its easier to install using the lathe and the drill chuck with a short allen wrench in a socket wrench. they drive straighter
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Thread inserts
Easy to install. Design your own knobs and use these inserts for a custom look.
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Nice product. I would recommend using a smaller bit than 1/2" for hardwood first like it said in the instructions.
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Easy to use!
These inserts were quite easy to use in end grain red oak. The one downside is the instructions for hole size packed with the inserts is wildly inaccurate but it's no big deal to make a couple of test hole and find the right size.
Highly recommended!
Highly recommended!
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These worked very well in the...
These worked very well in the end grain of baby crib I made using cherry! I used a 15/32 drill bit for the starter holes and had no trouble installing them with my hex wrench.
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June 16, 2011
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I've been using these inserts in...
I've been using these inserts in the furniture that I build for my customers. After stripping out the allen socket multiple times, I cut down a bolt slightly so that it doesn't protrude past the end of the insert, then used a socket in my cordless drill to drive the insert in. This method works really well.
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October 29, 2010
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I initially tried to install the...
I initially tried to install the insert by using a hex bit in my hand drill. That doesn't work very well and I had to remove a couple of broken inserts. I removed them by using epoxy, inserting a 1/4 - 20 hex nut and turning over the board so that the epoxy would flow towards the bolt. Next day, a wrench removed the bolt and insert easily. I found that using a ratchett works well.
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April 14, 2010
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Worked great. You just have to...
Worked great. You just have to make sure the correct size hole is drilled. I installed mine into red oak with a hex wrench with no problems.
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June 18, 2009
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Inserts may help
These inserts may help in some applications. Once installed properly they can provide a solid thread base. My only beef is that the chart provided is not correct. Be sure to try a scrap piece of wood first or you may be in for a surprise! The drill bit called for in the chart for use in hardwood will allow the insert to drop into your hole with no tread contact.
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Worked well however did strip out/crack...
Worked well however did strip out/crack some hex inserts while installing in Ash - solved by wobbling the drill just a bit to enlarge the hole slightly. Then all was fine and trouble free.
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January 26, 2011
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Do NOT follow package insert instructions
These work well. Do NOT, however, go by the chart packaged with the inserts. I bought the 1/4", and the insert indicated I should use a bit almost 1/2" in diameter. Fortunately, I tried it out on leftover stock before drilling into my project. Unfortunately, I spent about $10 on a bit that was WAY too large--the insert literally just fell right through the hole. (The specification was not for a 1/2" or standard size, but for a unique size not included in any standard bit set; it was, consequently, quite expensive.) After trying out some bits in my collection, I found that a 3/8 bit works well. So the product is good, but the instructions are very costly. Wish I had purchased the bit at Rockler, where I could have asked for my money back. Unfortunately, I had to go to Home Depot, and they obviously couldn't be expected to accept the return.
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July 4, 2017
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Not Happy with the Quality
As with many of the folks reviewing these I had 1/2 of the first package strip out the hex hole and then mushroom, causing the entire end to shatter. I'm going to try for the larger pilot hole and hope that works along with the double nut and bolt idea. The ultimate problem is the poor quality steel used. At almost $1 each they should be much stronger and better made.
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This pot metal barely works in...
This pot metal barely works in hardwood. Test holes a must because the recommended sizes were impossiblly too small. I had taught myself the double nut method driving hanger bolts for table legs. After stripping a couple hex inserts I applied the double nut. I came to write my tip and found Duane making the same recommendation. I use these inserts in the aprons for the rockler table angles. I have to enlarge one of the holes to 5/16 to fit the 1/4 hex bolts I use.
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December 2, 2012
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They worked well except in end...
They worked well except in end grain. I did not have the bit size called for in the plans so I had to make due with 3/8". The hex slot needs to either be slightly deeper or a tighter fit. I will certainly try to use some wax before next time. I would like to ask for some help. I need to get a few of the inserts out and could use some suggestions. Any help is appreciated.
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February 24, 2009
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My experience was similar to others....
My experience was similar to others. I am making my transitional bed out of Cherry, and the inserts stripped out with a 3/8" hole as directed. I found the 11/32 worked better but was still not foolproof. Harder material and a better fit for the allen wrench is needed as a real sloution.
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December 5, 2008
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I, too, am building the 3-in-1...
I, too, am building the 3-in-1 transitional bed in maple. It doesn't help that the packaging doesn't say what size allen wrench to use to drive them. I've found that 6mm works best, but it's still a loose fit. A 3/8" hole is recommended for hardwoods, but that's not big enough. The plans call for 3/8" holes everywhere except endgrain, where it calls for 13/32". I've re-drilled all holes to be 13/32", and I'm still stripping some of the inserts. 7/16" is too loose, but perhaps some epoxy could fix that. I'll definitely try the beeswax idea mentioned in another review before trying larger holes.
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March 5, 2008
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Our price is lower than the manufacturer's "minimum advertised price." As a result, we cannot show you the price in catalog or the product page.
You have no obligation to purchase the product once you know the price. You can simply remove the item from your cart.
You have no obligation to purchase the product once you know the price. You can simply remove the item from your cart.