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Rawlbolt drilling sizes guide

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#2 ·
I'm not sure what you want. If you have a 8mm bolt you need an 8mm hole.
If you are looking to tap a thread in hole for an 8mm bolt then you need a tap drill size which is 17/64 for m8-1.25 or J for an m8-1.0.
 
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Mr Chips
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