Tip & How-To about Hand Tools
If you need to tap a hole and do not have a drill tap chart and it is not absolutely critical that the threads are perfect, this is a quick way to determine what size hole to drill. Take a nut of the same size and thread pitch you want to tap. A drill bit that fits through the nut with just a bit of play will give you a close enough hole to tap. If the thread is metric an easy rule of thumb is to take the bolt size, deduct the thread pitch and another 0.1%, and that is your tapping drill size. eg. M 10 pitch is 1.5 mm, deduct this gives 8.5 mm, less another 0.1% gives 8.4mm, the closest tapping size for M 10 threads.
Posted by Hans... on
Jun 07, 2016 | Cars & Trucks
May 24, 2015 | Drills
Feb 06, 2011 | Yukon (744105200223) Weapon Sight