You can create a group of round holes, or a single round hole. Tekla Structures calculates the diameter of a round hole as the sum of Size and Tolerance.

1. On the Steel tab, hold down Shift and click Bolt to open the Bolt properties.
2. If you do not want to create any bolts, clear all the Assembly check boxes.

   

3. If needed, modify the hole properties.

   For example, to create partial-depth holes, set Plain hole type to Blind and enter a value in the Hole depth box.

4. Create the holes the same way you would create a bolt group:
   1. Select the main part, to which the secondary parts will be bolted.
   2. Select the secondary parts.
   3. Click the middle mouse button to finish selecting parts.
   4. Pick a point to indicate the hole group origin.
   5. Pick a second point to indicate the direction of the hole group x axis.

You can create a group of oversized holes.

1. On the Steel tab, hold down Shift and click Bolt to open the Bolt properties.
2. Next to Parts with special holes, indicate which plies of the connection get oversized holes by selecting the desired Special hole check boxes.

   For example:

   

3. If you do not want to create any bolts, clear all the Assembly check boxes.

   

4. In the Special hole type list, select Oversized.
5. In the Oversized box, enter the allowance for the oversized hole.

   You can also use a negative value to create smaller (tapped) holes.

6. Create the holes the same way you would create a bolt group:
   1. Select the main part, to which the secondary parts will be bolted.
   2. Select the secondary parts.
   3. Click the middle mouse button to finish selecting parts.
   4. Pick a point to indicate the hole group origin.
   5. Pick a second point to indicate the direction of the hole group x axis.

You can create a group of slotted holes.

1. On the Steel tab, hold down Shift and click Bolt to open the Bolt properties.
2. Next to Parts with special holes, indicate which parts should be slotted by selecting the desired Special hole check boxes.

   Tekla Structures counts the pieces of steel from the head of the bolt down. For example, if you select the second check box from the head of the bolt, Tekla Structures slots the second piece of steel from the head of the bolt.

   

3. If you do not want to create any bolts, clear all the Assembly check boxes.

   

4. In the Special hole type list, select Slotted.
5. Enter the allowance for the slotted hole in the x and y directions of the hole group using the Slotted hole X or Slotted hole Y boxes.

   

   (1) Tolerance

   (2) Slotted hole X or Y

   (3) Bolt size

6. If you want to rotate alternate holes by 90 degrees, select Even or Odd in the Rotate Slots list.

   

   (1) Crossing slotted holes to odd or even parts

   (2) Parallel slotted holes

7. Create the holes the same way you would create a bolt group:
   1. Select the main part, to which the secondary parts will be bolted.
   2. Select the secondary parts.
   3. Click the middle mouse button to finish selecting parts.
   4. Pick a point to indicate the hole group origin.
   5. Pick a second point to indicate the direction of the hole group x axis.