Theres charts for the sizing, for future reference :-
http://www.engineersedge.com/manufacturing/metric-iso-tap-drill-chart.htm
http://www.engineersedge.com/manufacturing/metric-iso-tap-drill-chart.htm
- Thread starter Can'tWeld
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Easy way to remember is thread size minus pitch = tapping drill eg M8x1.25 pitch is 8-1.25= 6.75mm drill
Windy Miller
Semi-Professional Potterer!
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I think before I started drilling things out to a smaller size, I would try running a die nut up it first, or even have a go with a thread file.
Even if the thread ends up being a bit messy, it's no big deal as the nut will never be under any great stress. All it has to do is stop the top of the shock sliding off the boss.
For a belt & braces approach, drill a small hole at the end of the threaded section, fit a castellated nut and a split pin - job done!
Possibly too late for this suggestion now though
Even if the thread ends up being a bit messy, it's no big deal as the nut will never be under any great stress. All it has to do is stop the top of the shock sliding off the boss.
For a belt & braces approach, drill a small hole at the end of the threaded section, fit a castellated nut and a split pin - job done!
Possibly too late for this suggestion now though
Chickenjohn
Morris Minor and Porsche 944 fan
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I would agree with the suggestion of running a die down the stud to revive the thread, you could as suggested drill a hole and use a castellated nut and split pin,and also Loctite on the thread,
Or, cut the stud off and weld a new one on.
Or, cut the stud off and weld a new one on.
metalspanner
Member
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The agricultural engineer says, best thing to do is shove shocker back on decent sized washer in front and nut behind and weld the sucker on the stud.
This is the practicle solution, but not the most effective, with regard to future changes etc.
This is the practicle solution, but not the most effective, with regard to future changes etc.
madkayaker
Pro sparkey Pro Welder
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Well I managed to drill and tap a hole for an M6 bolt. It's not quite straight but tightens up OK and holds the shock so I think it'll be fine. Cheers everyone 
Next I just need to sort out this stripped drainplug (thinking of welding a nut over) and repaint the tank in black, then MOT time!
Next I just need to sort out this stripped drainplug (thinking of welding a nut over) and repaint the tank in black, then MOT time!
It is accurate for 60 degree threads, like UNC/UNF and metric. That covers most threads people will be using these days.
