- Provides a Strong Machine Thread In Hard Woods
- Ideal For Use in Woods Like Oak, Cherry, and Maple
- Designed For Use In Furniture, Cabinetry, Storm Windows and Marine Applications
- Simply Drill the Appropriately Sized Hole and Install with Screwdriver or Optional Drive Tool
- Proprietary External Knife Threads Provide Superior Holding Power
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E-Z Lok Threaded Insert
|Price:||$2.00 - $16.30|
|Brand Name||E-Z LOK|
E-Z LOK Knife Thread inserts for hard wood significantly reduce the possibility of stripping when... See more product details
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Top Customer Reviews
1. Drill the hole slightly oversized for hardwood. I use a 9/32" bit when 1/4" is specified. I find that the threads will tear out a lot of wood if you try to force them into a smaller hole and you may damage the insert. Apply a bit of wood glue to the outside threads as both a lubricant and to lock them in place.
2. Do not try to screw these into place with a flat bladed screwdriver. It's frustrating and very likely to break the insert. Save the slot on the insert for if/when you have to remove the insert. To drive them, you can buy a tool, but I use a bolt of the right size, with a Phillips, hex or square drive (too hard to "steer" a slotted bolt). Thread a nut on the bolt so enough thread is exposed below the nut to go about 1/2 - 2/3 the way into the insert. Finger-tighten the insert against the nut and drive it in using the bolt. When it is seated, twist the driver backward sharply and the bolt should back out leaving the insert behind (otherwise, use a pair of pliers to loosen the nut).
- First and foremost, install one on a piece of scrap lumber before trying to install them in your project to avoid unpleasant surprises.
- I agree with those who suggest larger pilot holes. I had 1/4-20 inserts, for which the recommended hole size is 3/8". I was installing these in pine, which is a soft wood, but still found I got better results with a 13/32" hole (1/32" larger than recommended. When I tried one with a 3/8" hole the surface of the wood raised up a bit around the hole. At he very least I would drill out the pilot hole near the surface to avoid this problem. In harder woods I'd probably use an even larger hole.
- Having never used these before, I naively assumed they'd follow the holes I drilled for them, and as a result go in perpendicular to the wood's surface. Wrong. At least in pine they will go in at an angle if you aren't very careful unless you use some kind of jig to ensure they go in straight. I inserted a couple by hand and it was a pain to get them straight, so I made a simple jig to install them out of a short piece of 2x4, a 1/4" bolt and nut.
Using a drill press I drilled a 3/4" hole about halfway through the 2x4 and then drilled a 1/4" hole the rest of the way through. I inserted the bolt in the 1/4" hole and screwed a nut on the end until it was about half-an-inch past the end of the bolt.
To use it I screw an insert onto the bolt and finger-tighten it against the nut, and then push the insert back up into the recess until it's almost flush with the surface of the 2x4.Read more ›
The inserts are made of brass and have pre-cut "top" that can be used to screw the insert into whatever you are putting it in. The screwdriver diameter is a 1/2 inch, which is probably a bigger size than one would normally have in their toolbox. I purchased the E-Z LOK Drive Tool - Optional - Use with 329-6, 329-601, 329-624, 303-6, 303-624, 319-6, 319-624, 335-6, 450-10, 550-6, 650-10, 650-10F, 453-10, 653-10, 653-10F, 400-6, 400-624,, which worked like a charm (placed the bit in a vice, placed the threaded insert on top of that and then placed the tap handle on top of that and screwed it down onto the thread).
They recommend a half inch drill hole, which is pretty tight depending on the wood you're using (though going up a drill bit size would probably be too wide). You may need to sand your hole a bit wider to make the it a bit easier to get it started. Also, you may consider putting some wax, etc. on the threads before screwing in to help lubricate it.
DO NOT use for Hardwoods. Use the stainless steel type. E-Z LOK Threaded Insert For Hard Wood; 1/4-20 Int Thread; 303 Stainless Steel (Pack of 10)
It is a well made product that works extremely well, however the heading states:
"E-Z LOK Threaded Insert For Hard Wood".
I could easily rate this a 5 star if it stated it was for soft to medium density woods.
Suggest the following;
26/64" (13/32") pilot drill in Hard Wood such as oak or maple.
25/64" pilot drill in Medium Density such as Poplar or Ash.
3/8" pilot drill in soft to medium density woods such as pine.
Trying to drive them with the slot on top is a waste of time. It's very likely to tear out or even break. (And then you're hosed if you have to back the insert out of the wood at some point.) You can buy the dedicated driver tool but I just use a bolt of the right size with a nut threaded down so it can be threaded about 1/2 to 2/3s of the way into the insert. Use a bolt with a philips, hex or square drive (a slotted bolt will slide around) and screw the insert into the wood. Then you can usually back it out with a sharp reverse twist or, worst case, hold the bolt with the screwdriver and loosen the nut with a pair of pliers or a wrench. (Bonus: the nut will slightly dimple the wood making sure the top of the insert is below the surface level.) Applying glue to the threads isn't bad insurance, or apply a drop of superglue after the insert is set. One thing I use them for is creating threaded holes in MDF jigs, gluing them in. They're easy to salvage if the jig wears out or is no longer needed.
Most Recent Customer Reviews
Works well but the screwdriver slot stripped in tougher wood.Published 4 days ago by ChicagoConsumer
Just what I needed. Using on workbench to mount miter saw when in use, and also to hold pegs in place when working on other projects. Read morePublished 4 days ago by Jason McClain
Nothing to these really, work as advertized. Just wanted to pass along that even though these call for a 3/8" drill bit, I suggest a 25/64". Read morePublished 7 days ago by J. Ornelas
This is an excellent product that is easy to use. I needed some of these and my local hardware store only had a few. The local big box store had competitive products that I tried. Read morePublished 14 days ago by Perryaire
I could not get these to screw in straight . I drilled out the holes in some round oak chair legs to replace weak zinc wood insert nuts that had broken . Read morePublished 1 month ago by Amazon Customer
I've purchased close to 500 of these and the quality is always perfect.Published 1 month ago by Matt