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Car Forum / UK Car Forums / Car Maintenance (UK group) / February 2007Where can I get hold of self-tapping bolts?
I need a couple of self-tapping bolts to secure an exhaust bracket (the bolt goes straight into a hole in the undercarriage). The original bolts are no longer tight in the original holes. Where would be a good place to look for these? I've been told body shops usually have them. TIA >I need a couple of self-tapping bolts to secure an exhaust bracket > (the bolt goes straight into a hole in the undercarriage). The [quoted text clipped - 3 lines] > > TIA Body shops, roofing places, probably b and q. Screwfix definitely, I got some from them last year. Mrcheerful >>I need a couple of self-tapping bolts to secure an exhaust bracket >> (the bolt goes straight into a hole in the undercarriage). The [quoted text clipped - 8 lines] > > Mrcheerful You mean coach screws? Local engineers merchants. The price saving compared to B&Q will probably be quite dramatic, cos they tend to sell stuff like that in small price coded plastic packs. You end up paying about £2 for 2 screws! The one local to me is a fraction of the size of a B&Q, yet you seem to be able to buy just about anything over the counter! Stu >>>I need a couple of self-tapping bolts to secure an exhaust bracket >>> (the bolt goes straight into a hole in the undercarriage). The [quoted text clipped - 6 lines] > > You mean coach screws? Unlikely, I think. A coach screw to me is a square or sometimes hex head large woodscrew - typically 1/4" or 6mm minimum diameter. I'm not sure about a conventional self-tapper or roofing screw, either. I'd be surprised if an exhaust bracket was held to the "undercarriage" (what? is this an aircraft?) by anything less than 6mm diameter, and that's quite big for a self-tapper. I suggest the OP drills out the old thread to the tapping size for the next screw up - perhaps even going to an imperial size if that makes it easier - and re-taps it. That assumes there's no way of using a nut above the defective thread, and that using a new screw, perhaps with a drop of Loctite, doesn't work either.  SignatureKevin Poole **Use current month and year to reply (e.g. feb2007@mainbeam.co.uk)*** >I'm not sure about a conventional self-tapper or roofing screw, either. >I'd be surprised if an exhaust bracket was held to the "undercarriage" >(what? is this an aircraft?) by anything less than 6mm diameter, and >that's quite big for a self-tapper. He might be after some techscrews (blurb says " light section self drilling screws with self tapping thread") the ones I use for fixing panels will drill through 3mm mild steel. They're timco from any builders merchant. AJH >>>>I need a couple of self-tapping bolts to secure an exhaust bracket >>>> (the bolt goes straight into a hole in the undercarriage). The [quoted text clipped - 12 lines] >I'd be surprised if an exhaust bracket was held to the "undercarriage" >(what? is this an aircraft?) Just a manner of speaking. There are also the usual two rubber rings holding the back of the rear silencer to the chassis. > by anything less than 6mm diameter, and >that's quite big for a self-tapper. It's actually two 10mm, bolts. > I suggest the OP drills out the old >thread to the tapping size for the next screw up - perhaps even going to >an imperial size if that makes it easier - and re-taps it. That >assumes there's no way of using a nut above the defective thread, and >that using a new screw, perhaps with a drop of Loctite, doesn't work >either. I'm hoping I can just force the next size up in without any drilling/retapping. And yes, there is no access above the defective thread. >>>>> I need a couple of self-tapping bolts to secure an exhaust bracket >>>>> (the bolt goes straight into a hole in the undercarriage). The [quoted text clipped - 31 lines] > drilling/retapping. And yes, there is no access above the defective > thread. If you can force the next size up in then you could retap it more easily. >>>>>> I need a couple of self-tapping bolts to secure an exhaust bracket >>>>>> (the bolt goes straight into a hole in the undercarriage). The [quoted text clipped - 33 lines] > >If you can force the next size up in then you could retap it more easily. I think the steel is only a few mm thick. >>>>>>> I need a couple of self-tapping bolts to secure an exhaust bracket >>>>>>> (the bolt goes straight into a hole in the undercarriage). The [quoted text clipped - 40 lines] > > I think the steel is only a few mm thick. It should still be fine. Wear goggles, drill it, & then tap it with a really well greased tap. Cordless drills make really good tap wrenches. >>>>>I need a couple of self-tapping bolts to secure an exhaust bracket <big snip> >>(what? is this an aircraft?) > [quoted text clipped - 5 lines] > > It's actually two 10mm, bolts. If the makers thought it needed two 10mm bolts, don't you think it's a bit optimistic to expect a couple of self-tappers to do the same job? But I suspect you mean 6mm bolts, which are 10mm across the flats of the hex. Tek screws, as suggested elsewhere, are also usually between 5 and 6.3mm nominal diameter, depending on whether they're supposed to be for biting into timber, thin metal, or thick metal. The Screwfix ones intended to cut a thread in steel thicker than a millimetre or so are only 5.5mm diameter, so they wouldn't have much bite in a worn hole previously tapped M6. > I'm hoping I can just force the next size up in without any > drilling/retapping. Unless you can find some 1/4" bolts to try, the next size up is 8mm, which won't even look at a 6mm hole. "When all else fails, use damn great nails" SignatureKevin Poole **Use current month and year to reply (e.g. feb2007@mainbeam.co.uk)*** >>>>>>I need a couple of self-tapping bolts to secure an exhaust bracket > [quoted text clipped - 11 lines] >If the makers thought it needed two 10mm bolts, don't you think it's a >bit optimistic to expect a couple of self-tappers to do the same job? The original bolts were self-tappers. One still holds reasonably well, the other not at all. >But I suspect you mean 6mm bolts, which are 10mm across the flats of the >hex. Yes indeed. Thanks. >Tek screws, as suggested elsewhere, are also usually between 5 and 6.3mm >nominal diameter, depending on whether they're supposed to be for biting [quoted text clipped - 10 lines] > >"When all else fails, use damn great nails" OK, so maybe some drilling will be required, but given the thickness of the metal retapping doesn't seem necessary. >>>>>>> I need a couple of self-tapping bolts to secure an exhaust bracket >> [quoted text clipped - 37 lines] > OK, so maybe some drilling will be required, but given the thickness > of the metal retapping doesn't seem necessary. If oit's that thin then a big blob of milliput/chemicxal metal might be easier. >>I need a couple of self-tapping bolts to secure an exhaust bracket >> (the bolt goes straight into a hole in the undercarriage). The [quoted text clipped - 6 lines] >Body shops, roofing places, probably b and q. Screwfix definitely, I got >some from them last year. Cheers. Is "self-tapping bolts" the right name for these? Coach bolts such as those used for bolting satellite dishes to walls might do the trick. >>>I need a couple of self-tapping bolts to secure an exhaust bracket >>> (the bolt goes straight into a hole in the undercarriage). The [quoted text clipped - 10 lines] > bolts such as those used for bolting satellite dishes to walls might > do the trick. you don't want coachscrews. look on the screwfix site for item no:12714, this is a 6 mm self drilling bolt with an 8 mm head, I often use them for similar jobs. they are 7.50 for 100 Mrcheerful [snip] >> Cheers. Is "self-tapping bolts" the right name for these? Coach >> bolts such as those used for bolting satellite dishes to walls might [quoted text clipped - 6 lines] > >Mrcheerful Aren't these also called...... "speed bolts"? Stephen. Signaturehttp://www.stephen.hull.btinternet.co.uk Coach painting tips and techniques + Land Rover colour codes Using a British RISC Operating System 100% immune to any Windows virus. "Whatever is rightly done, however humble, is noble". Henry Royce >>>>I need a couple of self-tapping bolts to secure an exhaust bracket >>>> (the bolt goes straight into a hole in the undercarriage). The [quoted text clipped - 15 lines] >bolt with an 8 mm head, I often use them for similar jobs. they are 7.50 for >100 That might be a little small. The existing bolts have 10mm heads so I assume the thread is commensurately larger. But thanks anyway, now I know what to look for. >>>>>I need a couple of self-tapping bolts to secure an exhaust bracket >>>>> (the bolt goes straight into a hole in the undercarriage). The [quoted text clipped - 21 lines] > assume the thread is commensurately larger. But thanks anyway, now I > know what to look for. No. 10mm head is usually used with a 6mm thread size. 8mm head in this case is also on a 6mm thread. So the bolt size is very likely to be the same. Mrcheerful |
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