peggysue Posted July 18, 2009 Report Share Posted July 18, 2009 hi again people , right my old school echo that i bought to get back into riding had a couple of the brake mounts rounded off so i bought a helicoil kit and redid all 4 mounts. works a charm, now a friend has offered me a more recent bike frame but his mounts to were stripped. he did not have a helicoil kit so tapped them to the next size up m6 and drilled his brake mounts and booster to suit. what i want to know is if i was to take the frame could i screw some helicoils straight into the mounts to bring them back down to m5 size like normal or is the tapping kit that comes woth the helicoil a specific kind of thead pattern where the helicoils could not really go straight in? and if so could i run my helicoil tap through the mounts again to fix it?hope you understand my aim!!!thanks karl Quote Link to comment Share on other sites More sharing options...
weirdoku Posted July 18, 2009 Report Share Posted July 18, 2009 I'm pretty sure one of the holes in my mates frame was tapped to M6 and I just put a helicoil in. The tap is M6 (6mm) size anyway, and the helicoil is 1mm thick so when you put that in you have a M5 size thread. So yeah you should be able to just put screw a helicoil in the M6 holes. You might want to run your tap down the M6 holes to clean it up a bit before putting the helicoil in though. And no, the thread size should be the same. Quote Link to comment Share on other sites More sharing options...
Muel Posted July 19, 2009 Report Share Posted July 19, 2009 The helicoil kit comes with a special tap, it's not 6mm it's about 5.7 or something I think.I'm pretty certain that this is the case anyway... Quote Link to comment Share on other sites More sharing options...
qfjsy Posted August 6, 2009 Report Share Posted August 6, 2009 If the threads had in fact been stripped, it may be possible to make a repair using a "HeliCoil Insert". Rather than giving a description I'll reference their website where they are described in some detail –http://www.xhcljx.com/eng Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted August 6, 2009 Report Share Posted August 6, 2009 The helicoil kit comes with a special tap, it's not 6mm it's about 5.7 or something I think.The issue's not with the diameter it's the pitch. You need the M5 thread to be M5 x 0.8mm and a standard M6 thread is M6 x 1.0mm. Therefore an M5 insert will be threaded internally with M5 x 0.8mm and externally it'll be M6 x 0.8mm. Does that make sense? Anyway, if the threads have been changed to be M6 x 1.0mm then no, you won't be able to stick a Helicoil insert in.If the threads had in fact been stripped, it may be possible to make a repair using a "HeliCoil Insert". Rather than giving a description I'll reference their website where they are described in some detail –http://www.xhcljx.com/engYeah... that's not really answering his question though. Quote Link to comment Share on other sites More sharing options...
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