Tapped Hole Info: M6 Size & Bolt Diameter Clarified

In summary, a tapped hole is a hole that has been threaded for a bolt. A tapped M6 hole may not necessarily have a diameter of 6mm, as it also depends on the number of threads on the bolt. A tap drill size chart can be used to determine the appropriate size for the hole, including clearance hole sizes. It is important to note that the major diameter of an M6 thread is 6mm, but the minor diameter will be measured when using calipers or mics. If the unthreaded part of the bolt also needs to fit into the hole, two different drills will be needed.
  • #1
engineer1969
1
0
I just want to clarify. A tapped hole is basically a hole that has been threaded for a bolt. Is this correct?

So would a tapped M6 hole be 6mm in diameter for a 6mm diameter bolt?

Cheers
 
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  • #2
yes :smile:
 
  • #3
Wait, are you asking what size hole to drill that will then be tapped for an M6 bolt? Then that's not 6 mm, and it also depends on the number of threads on your bolt. You need a chart of tap drill sizes like this
http://www.csgnetwork.com/screwmetmachtable.html"
which also gives you clearance hole sizes.
 
Last edited by a moderator:
  • #4
You're right that a tap drill is smaller than the nominal call out diameter on any tapped hole, but that's not what the OP is asking. In an M6 the major diameter of the thread is 6mm. I would just be certain that the OP realizes that if they take a set of calipers or mics to the hole, they will be measuring the minor diameter and thus gtting the tap drill size.
 
  • #5
depends if the unthreaded part of the bolt also needs to be in the hole
then you need two drills a smaller one for the part the threads are cut in
and a true 6mm for a redrill of the unthreaded upper part
 

1. What is the M6 size?

The M6 size refers to the metric measurement of the tapped hole, which is 6 millimeters in diameter. This measurement is used for standard bolts and screws in most industrial and mechanical applications.

2. How is the bolt diameter determined for a tapped hole?

The bolt diameter for a tapped hole is determined by the size of the hole itself. In the case of an M6 tapped hole, the bolt diameter would also be 6 millimeters. It is important to use a bolt with the same diameter as the tapped hole to ensure a secure fit.

3. Are M6 tapped holes and bolts interchangeable with imperial measurements?

No, M6 tapped holes and bolts are not interchangeable with imperial measurements. Metric and imperial measurements have different standards and thread pitches, so it is important to use the correct size for each type of measurement.

4. Can an M6 tapped hole be used with different bolt lengths?

Yes, an M6 tapped hole can be used with different bolt lengths as long as the diameter of the bolt remains the same. This allows for flexibility in applications where varying bolt lengths may be needed.

5. Are there any other important factors to consider when using an M6 tapped hole?

Yes, it is important to also consider the thread pitch and depth of the tapped hole. These measurements can vary depending on the specific application and should be carefully chosen to ensure a proper fit for the bolt.

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