Use the 5/16-18 Coarse Brass and Gold Steel Wood Insert Nuts (10-Pack) for general-purpose fastening jobs. Obviously, you won’t be pulling out the torque wrench on your bench, but since threads themselves are natural stress risers, and given the natural tendency of wood to split along its grain (as opposed to a homogeneous metal), I’m wondering if repeated tightening might cause the threads themselves to completely shear off and what kind of force would be required to do that.
I’m finishing up my drill press and router table and am having problems getting the threaded inserts to start / stay in. I’m using Rocklers insert for a 5/16 t-bolt but in using a 3/8 (recomended), 7/16, and also 1/2 guide hole I can’t get them to thread in. I also built the jig they had in wood magazine that centers a vertical bolt w/ washer and double nut over the insert then using a ratchet and still no luck.
But I don’t quite understand why the tee nut inserts, where the part that screws into the wood is never loosened, and where all the adjustment movements are metal-to-metal, why that wouldn’t be preferable to the method you show here, where any adjustment involves the wood-to-metal connection, which is surely more vulnerable to degradation of the connection.
The notched end is to help with tapping the threads, and should be the first part of the threaded insert that enters the material. Manufactured to BS 4377 BS 3049 parts 1 & 2. Recoil helically-wound thread inserts are formed from 18-8 (Type 304) Stainless Steel. Screw locking inserts have a series of straight segments to provide self-locking torque on the bolt, eliminating a need for other threadlocking methods. If they’re the inserts that I think they are, they’re meant to be hammered or pressed in. If you’re spinning them, then the barbs that are supposed to hold them in place are going to chew up the wood like a rasp, and they won’t work.
For instance if you look at the EZLok website, it’s quite clear that the slot is used for driving the insert into the wood. Provides excellent thread durability but where maximum strength is required other inserts shown in this catalogue should be preferred. Your choice is to either fill the holes with wood filler, something like -performance-wood-filler then either push the thread insert in with the wood filler before it sets, or re-drill new holes. When you compress wood it will push back (think spring) and it will hold your tee nut. Another great place to use threaded inserts is to make assembly easy and/or tight and ridged.
However special tools and drilling is required to fit the Threaded Insert and care and attention should be taken to ensure the correct use of the tool, staff can supply you with an instruction manual. We have thread inserts in-stock for use on a wide range of materials including metal, wood, plastic and particle board. Threaded Inserts designed for use in tough-to-tap, high-strength materials as well as softer metals and plastics. I’d have never thought to do it-for worry of the bolt stripping out the relatively fragile wood.
One alternative that we can’t forget to mention here is the Tee Nut These little threaded inserts accomplish the same thing as the threaded bolt technique only instead of actually cutting threads, we simply insert a threaded insert into a hole. Inserts with internal thread lock are designed to securely lock a bolt when it is entered into the insert only a few turns. Threaded inserts are screwed into preformed or predrilled holes and cut own threads into the wall of permanent installations. This is because the bolts threads are sized perfectly to fit into the threads that are cut into the wood. E-Z LOK knife thread hard wood inserts are available in brass and stainless steel.
It’s sized for the machine screw but the outside diameter is the same as the hole that the threaded inserts go into. E-Z LOK 10-24 (25 Pieces) Internal Thread, Die Cast Zinc Alloy Threaded Insert is an inexpensive insert for use in furniture, drawer pulls and wherever assembly and dis-assembly is required. It sounds like you’re trying to install thread-in inserts in the face of a piece of MDF, which is fine but not ideal.
Tappex® has a specific thread inserts designed for critical applications in Light-metal alloys such as: Castings, Extrusions, Machined & fabricated parts produced from Aluminium, Zinc & Magnesium. Instead of using a screwdriver to drive the threaded insert, get a bolt with the same threads as the inside of the threaded insert, screw two nuts onto it, and jam the nuts tight against each other.
I also need to get a 5/16 bolt and some nuts so that I can install the new thread inserts properly as shown in the above linked video. I have to admit that I’m not totally getting how you intend to use the inserts so I’m not sure I can answer the overall strength question but I believe if it’s properly inserted into the wood it becomes integral with it and it would be difficult for it to fail.
E-Z Lok Brass Knife Thread Inserts for Wood: The E-Z Lok Brass Threaded Insert for Wood is a high quality solid brass fastener that is designed forhard woods, like oak, cherry and maple. Request a quote on hard wood inserts and soft wood inserts for your application, or contact E-Z LOK to learn more. Interesting… I understand the idea that loosening and re-tightening a regular wood screw would degrade the connection over time.
To insert the insert, select a long screw which is threaded all the way up to the head. They drilled a slightly oversize hole, the threads of the insert should barely dig in (my inserts just set in without any screwing). The above Threaded inserts for wood are examples of the various threaded inserts that are used in wood applications. Our threaded brass inserts for wood have an external thread which is suitable to wood where no thread is available. I also slightly chamfer the edge of the hole so the initial bite is in the wood a little.
Hopefully that locks everything together and will back the threaded insert out as you remove the bolt. The fit between the screw and wood is actually better than using a tap and holds well, but I would only use these (or your tap method) in hardwoods as some previous post have mentioned the threads are just not that deep compared to using say a threaded insert. I used a tap the size of the outside threads on the insert and threaded the maple.
It seems to me that using inserts would just complicate things if you wanted to change the arrangements. We will use a nut driver on the nut to seat the insert, but before doing this, smear a little bee’s wax, or paraffin wax, or even some bar soap, or thread grease on the insert thread to ease and lubricate its passage into the wood. Insert Nuts provide a strong, permanent thread for wood and wood based sheet materials.
E-Z Lok Brass Knife Thread Inserts for Wood: The E-Z Lok Brass Threaded Insert for Wood is a high quality solid brass fastener that is designed for hard woods, like oak, cherry and maple. Helicoil also makes special inserts that have flat sides to give a locking behavior without having to use loctite or helical spring washers. I’ve had the inserts pull out and also had the machine threads pull out of the inserts.
Redrilling the holes for new thread inserts shouldn’t be a problem but it’s something I don’t particularly want to do. For the existing holes I’m thinking of getting larger thread inserts and then drilling the existing holes out and using some slightly bigger diameter bolts. If you’re installing the threaded inserts into the edge of MDF, you should strongly consider knock-down hardware instead.
Keylocking inserts are used to repair threads by tapping the worn thread to a standard larger thread, twisting the insert into place and then driving in the keys to lock the insert. The insert is threaded onto the bolt till it is against the lower nut, then you hold the drill as close to a right angle as you can get, and put the insert in. Use low speed – about 1-2 rotations per second. My thinking is the in wood the chips just don’t hold together enough to require that. Threads in wood have been around a long time, infact before they were in metal. Request a quote today or contact E-Z LOK for more information on our high quality, high strength inserts for wood.
Once the threads are cut into the wood, you can pretty much remove and replace the bolt as many times as you want and it really doesn’t do any damage to the wood. Well imagine that… all those wine bottle stoppers i made with threaded inserts, mine are in backwards too! Also known as keenserts, keylocking inserts are available in mild steel and stainless steel.
I remember that he tapped directly into the bubinga for the headboard, but on the footboard he used threaded inserts. First off, one end may have notches cut into it, as though you’re supposed to use a slotted/flat-head screwdriver to drive it. If the threads extend all the way to the end, and the notches cut through the threads, then forget intuition; that’s not how you’re supposed to drive the threaded insert. I tried on a piece of scrap wood that matches my neck wood, and it didnt end up so well using a T – driver so you can do it by hand. The driving tangs of helicoil inserts must be removed to prevent interference with the end of the assembled screw.