Paducah Home Theater Posted July 5, 2016 Share Posted July 5, 2016 (edited) Got a couple of DE-750 compression drivers from a forum member but they didn't come with bolts. They're supposed to have the two sided bolts where one side goes in the driver then you put the horn on then put nuts on the other end. Problem is, I have no idea what these are called, or where to find them. The thread pattern is a typical M6. Can normal bolts be used? I guess I'm going to try that next, could be that a 50/65mm long bolt would fit just fine. Edited July 5, 2016 by MetropolisLakeOutfitters Quote Link to comment Share on other sites More sharing options...
Marvel Posted July 5, 2016 Share Posted July 5, 2016 You can get threaded M6 rod at Lowe's. Bruce Quote Link to comment Share on other sites More sharing options...
babadono Posted July 5, 2016 Share Posted July 5, 2016 You can't put bolts(machine screws) through the holes in the horn lens and then into the driver? Quote Link to comment Share on other sites More sharing options...
Paducah Home Theater Posted July 5, 2016 Author Share Posted July 5, 2016 (edited) You can't put bolts(machine screws) through the holes in the horn lens and then into the driver? That's what I'm trying next. I have some on me that are the right thread but they are way too long, going to try some shorter ones. Wasn't entirely sure if there's any reason why I wouldn't want to do that but surely it's ok. Edited July 5, 2016 by MetropolisLakeOutfitters Quote Link to comment Share on other sites More sharing options...
babadono Posted July 7, 2016 Share Posted July 7, 2016 So did it work? Quote Link to comment Share on other sites More sharing options...
bhendrix Posted July 7, 2016 Share Posted July 7, 2016 McMaster-Carr http://www.mcmaster.com/#standard-threaded-rods/=136m4hm 1 Quote Link to comment Share on other sites More sharing options...
Karsoncookie Posted July 7, 2016 Share Posted July 7, 2016 (edited) If a "threaded rod" is needed for some reason,, woudn't it be simplest/ cheapest/ quickest to get a long appropriate bolt at local hardware store and just cut off the head ? I assume the fastener you need is less than 2 or3 inch, which should be available as a slotted or phillips machine screw or hex drive. May be hardened, may need to grind rather than cut. I mean , I do not know that driver or horn, are you saying the original fastener is some custom proprietary neccesitated piece? Or maybe it's a "stud" type mounting, using a short "threaded rod"? If so, and the threaded hole does not go through, wouldn't a correct length sccrew work? Maybe I'm missing something, but hard to believe it's complicated. Lars Edited July 7, 2016 by Karsoncookie Quote Link to comment Share on other sites More sharing options...
Karsoncookie Posted July 8, 2016 Share Posted July 8, 2016 I looked at at photo of the driver, and I see the blind holes. Actually, aren't most or many others like that also? So anyway, just get a screw the appropriate length. The nice thing is you can choose choice of finish including black, and some head style you like, and will no longer have an ugly stud end hanging out of a nut showing. Somehow that sentence sounds dirty. Anyway - I like these in either black or stainless - more common styles and sizes typically available at old style hardware stores in those little Hillman drawers. Lars https://www.google.com/search?q=socket+head+cap+screw&rlz=1C1AVNC_enUS590US647&espv=2&biw=1040&bih=892&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi2yvuU0uLNAhXJZCYKHVJZAmkQ_AUIBigB Quote Link to comment Share on other sites More sharing options...
Woofers and Tweeters Posted July 8, 2016 Share Posted July 8, 2016 Lars, your link is socket head bolts and they are, usually harder...harder than grade 8. McMaster Carr is a good source, but shipping is high. Quote Link to comment Share on other sites More sharing options...
Woofers and Tweeters Posted July 8, 2016 Share Posted July 8, 2016 Got a couple of DE-750 compression drivers from a forum member but they didn't come with bolts. They're supposed to have the two sided bolts where one side goes in the driver then you put the horn on then put nuts on the other end. Problem is, I have no idea what these are called, or where to find them. The thread pattern is a typical M6. Can normal bolts be used? I guess I'm going to try that next, could be that a 50/65mm long bolt would fit just fine. What you're describing is, generally, called a stud. As mentioned, you can get some 'all-thread' and some nuts and cut the all-thread to your needed length, then dress the cut ends (the threads get slightly deformed from the cut) so they will start easy, both nut and in the driver. Unless it's through holes where you can let the head of a smaller diameter bolt shoulder against one of the flanges, I would get what you need = I would avoid doing this. Machining is something that I do. PM me what you need and I'll send you just that. Quote Link to comment Share on other sites More sharing options...
Karsoncookie Posted July 8, 2016 Share Posted July 8, 2016 (edited) Sooo, why not the Hillman drawers? Only need to buy qty you need, you can see and choose in hand, and local. Hardened - so grind them shorter. Agreed? Lars I assume most folks are familiar with theses, but hey I dunno maybe not everybody. Edited July 8, 2016 by Karsoncookie 2 Quote Link to comment Share on other sites More sharing options...
mungkiman Posted July 8, 2016 Share Posted July 8, 2016 Don't forget the nuts... Quote Link to comment Share on other sites More sharing options...
Karsoncookie Posted July 8, 2016 Share Posted July 8, 2016 He may not be able to get M6 threaded rod at local hardware, but he will be able to get sufficiently long thread on a bolt easily, hence my suggestion Lars Quote Link to comment Share on other sites More sharing options...
Karsoncookie Posted July 8, 2016 Share Posted July 8, 2016 Don't forget the nuts... Speaking of which, I brought one of our little ones today to do just that. Doing good, sleeping on couch with the cone collar. Lars Quote Link to comment Share on other sites More sharing options...
Karsoncookie Posted July 8, 2016 Share Posted July 8, 2016 Obviously, if the threaded holes are not blind, but through, use care in depth of fastener in them. Lars Quote Link to comment Share on other sites More sharing options...
Woofers and Tweeters Posted July 8, 2016 Share Posted July 8, 2016 Sooo, why not the Hillman drawers? Only need to buy qty you need, you can see and choose in hand, and local. Hardened - so grind them shorter. Agreed? Lars I assume most folks are familiar with theses, but hey I dunno maybe not everybody. I agree 100% Quote Link to comment Share on other sites More sharing options...
mungkiman Posted July 8, 2016 Share Posted July 8, 2016 Don't forget the nuts... This thread was answered before post #4. 1 Quote Link to comment Share on other sites More sharing options...
jason str Posted July 8, 2016 Share Posted July 8, 2016 If you are going to cut or grind any bolt or threaded rod to length its best to use a thread chaser or at least put a nut on the thread before cutting, it is nearly impossible to get a nut started on a mangled end of a bolt. 1 Quote Link to comment Share on other sites More sharing options...
Karsoncookie Posted July 8, 2016 Share Posted July 8, 2016 Not to crap the thread, but I think it's answered so.. Jweber - You mentioned you do machining. On another post question was being asked about K400 gasket, which led to throat reaming. I'm curious, labor time wise - Is it much more time consuming to index reamer on the threaded hole ID, rather than just ream the ID of throat which may not depending on mold quality, be the same "centering" on the end result installed driver? Lars Quote Link to comment Share on other sites More sharing options...
Karsoncookie Posted July 8, 2016 Share Posted July 8, 2016 Don't forget the nuts... This thread was answered before post #4. The OP still seemed unsure. We all have our own OC, one of mine is hardware. Besides, I put out some possibility's he may not have thought of Thank you for your support. Lars Quote Link to comment Share on other sites More sharing options...
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