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Model Forum / General / Models / February 2009re-cutting a 5mm thread?
This is kinda OT, but this group has more knowledge of small threads that any other I can think of. I have a fairly-stripped, threaded hole (mudguard fitting eye, if you care) on my bicycle. If I tighten the bolt just-a-little-too-much is slips the thread. It's currently 5mm. What can retap to to remedy matters? I am aware that a "minor" retap to a different pitch would be a disaster, but the hole is quite shallow - probably only 4-5 turns, so minor pitch changes can be tolerated, The alternative is to re-tap to a big enough hole to remove all the old threads, which I'd rather avoid. So, can anyone recommend a thread with is similar (enough...) in pitch to 5mm, but slightly greater in OD? BugBear > This is kinda OT, but this group has more knowledge of small threads > that any other I can think of. [quoted text clipped - 14 lines] > So, can anyone recommend a thread with is similar (enough...) in > pitch to 5mm, but slightly greater in OD? There are none that I'm aware of. Helicoil it back to 5mm or drill and tap it out to 6mm are the options.  SignatureDave Baker Can you not use a M5 screw and fit a nut on the back of the projectin thread, may have to be a traditional thin locknut if there is not roo for a nyloc Or 1BA is 5.3mm OD but about 28tpi Jaso -- jasonballam > Can you not use a M5 screw and fit a nut on the back of the projecting > thread Sorry, I didn't give enough detail. The hole is in a braze on, on one face of a tube (so the bolt end ends up inside the tube) which is neat, tidy, and doesn't allow the use of a nut :-( BugBear > The hole is > in a braze on, on one face of a tube which is > neat, tidy, and doesn't allow the use of a nut :-( Then you want a blind rivet nut! Nick SignatureThe lowcost-DRO: <http://www.yadro.de> > This is kinda OT, but this group has more knowledge of small threads > that any other I can think of. [quoted text clipped - 16 lines] > > BugBear If you have access to both sides and plenty of clearance you could try a 4mm screw with a similar head not forgetting a spring washer under the nut. SignatureNeil reverse ra and delete l Linux user 335851 > This is kinda OT, but this group has more knowledge of small threads > that any other I can think of. [quoted text clipped - 14 lines] > So, can anyone recommend a thread with is similar (enough...) in > pitch to 5mm, but slightly greater in OD? I couldn't find a matching tap but this <http://tinyurl.com/bp8wyv> seems to show they may exist. Hth, SignatureBoo > This is kinda OT, but this group has more knowledge of small threads > that any other I can think of. [quoted text clipped - 16 lines] > > BugBear For a mud-guard eye, fill with braze, drill and re-tap. > For a mud-guard eye, fill with braze, drill and re-tap. That'd work, but require some respray afterwards. But some kind of hard filler (perhaps epoxy) might buy me some time. BugBear >> For a mud-guard eye, fill with braze, drill and re-tap. > [quoted text clipped - 4 lines] > > BugBear M5 Helicoil or Recoil kit. use stainless inserts for corrosion resistance. Mark Rand RTFM 5mm is 0,8 pitch 1BA is 5.3mm and 0.9 pitch Those wankie American numbered threads have a #12 x 28 giving you 5.48mm x 0.907 pitch John S. >> For a mud-guard eye, fill with braze, drill and re-tap. > [quoted text clipped - 4 lines] > > BugBear If you can work it, a stud epoxied in the hole with a nut on the stud would likely hold. Don Young (USA) > So, can anyone recommend a thread with is similar (enough...) in > pitch to 5mm, but slightly greater in OD? How about 7/32" x 32 TPI (5.56 x 0.79) - Tracy Tools offer one at £3. You'd have to make the screw though. SignatureCharles Lamont >> So, can anyone recommend a thread with is similar (enough...) in >> pitch to 5mm, but slightly greater in OD? > > How about 7/32" x 32 TPI (5.56 x 0.79) - Tracy Tools offer one at £3. > You'd have to make the screw though. That's *most* interesting. Thanks. BugBear |
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