If you want to go all metric, I would get a M5x.8mm screw by 10mm long and the correct M5x.8mm tap and 4.2mm drill bit to tap the hole for it. I don't know how much all this will help you as I don't know if you will be able to get an Imperial tap in your country. In your case, if you want to drill and tap for a 10-32 screw, you need a 4mm drill as it will be the closest to a #21. You want the hole drilled to be smaller than the screw so you can tap it correctly. In looking at the charts you posted, for a 10-32 screw, you need to use a #21 drill bit. To get the decimal length, simply divide 13 by 32 which equals. The final piece of information is the length of the screw - usually expressed as a fractional number. 03125 inches between the 'peak' of each thread on the screw (or. For 32 threads per inch (tpi), that means there is. It has nothing to do with the actal length of the screw, just tells you how coarse or fine the threads are. This is the thread pitch (number of complete threads in a 1 inch long screw). The second part of the name after the - is 32. In this case, it is a number 10 which means the screw thread (major) diameter is. In America, screws under 1/4" are given a nmber to identify their thread diameter. The dash (-) tells you that it is not a dimension but the screw callout. For example, 10-32 x 13/32 screw as you posted. Bear with me and I will try to explain a little.Ī typical 'American' screw is given with a number, a thread pitch and a length. Marco, you still sound really confused on this. (Cuz I dont think the service of the store will know what a #20 Pilot is.) So I just have to find a drill bit with a diameter that is within the range 4.0 - 4.3 mm right? I am so confused xD If I look up 11/64" in the wikipedia chart it says that 11/64" are 4.3656 mm or 0.17188 inches. After doing this, the thumbscrew should slide easily into the hole." Drill out the hole for the blade retention screw with an 11/64" drill bit. :/ĭouble Edit: "Now take the Anakin tube, that is totally empty. kit hopefully I will be able to tap the hole for the blade retention screw. I found this chart online -> I don´t really know if it is usable for my purposes.īut it says for example: 5/32" are 3.9688mm so lets say if I find a 3.5 - 3.9 mm drill head in my local hardware store it should be usable to tap the hole right?Įdit: Or somehow I could use this one here -> Water pipe and copper tubing have "nominal" sizes which are NOT their actual size, but rather indicate what size they would be compatible with if you tried to match them up with old cast-iron pipe, for example. Nobody ever runs to the store to purchase a 1/10th Horsepower lightbulb) However, in the US, unless you went to college to be a scientist/engineer, you don't use metric very much (lightbulbs, strangely, are an exception. In many cases, they are carry overs from a hundred years ago or more. Your conversion is then of course 25.4mm per inchĪnd yes, the numbering schemes are complicated, confusing and generally antiquated. The 13/32" measurement does indeed mean 13/32nds of an inch. If your metric is too much bigger, you will either get partial depth threads, or no threads at all. If your metric is too much smaller, you will have difficult time tapping due to overly tight pilot hole. Then compare SAE drill bit sizes or #s for your closest metric equivalent drill bit. You can search for TAP sizes in SAE and find which drill bit to use for the pilot hole. If you look up drill bit sizes online, you should be able to find the nearest metric equivalent drill bit. The pilot hole used prior to tapping a 10-32 screw is a #21 drill bit It is the #number of the screw and the thread count per inch.
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