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 checkboxes.

   

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.

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. If you do not want to create any bolts, clear all the Assembly checkboxes.

   

3. Next to Parts with special holes, indicate which plies of the connection get oversized holes by selecting the desired Special hole checkboxes.

   For example:

   

4. If you want to create similar holes in each of the parts with oversized holes, select the Use the same settings for all special holes checkbox.

   The holes will be created using the properties of the holes in the first part from the bolt head.

   If you clear this checkbox, you can define hole properties separately for each of the parts with oversized holes.

5. In the Special hole type list, select Oversized.
6. In the Oversized box, enter the allowance for the oversized hole.
7. If needed, modify the other hole and bolt properties.
8. Create the holes the same way you would create a bolt group.

You can create a group of slotted holes. You can also create slotted holes with offsets from the bolts.

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 checkboxes.

   

3. Next to Parts with special holes, indicate which parts should be slotted by selecting the desired Special hole checkboxes.

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

   

4. If you want to create similar holes in each of the slotted parts, select the Use the same settings for all special holes checkbox.

   The holes will be created using the properties of the holes in the first slotted part from the bolt head.

   If you clear this checkbox, you can define hole properties separately for each of the slotted parts.

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

   

   (1) Tolerance

   (2) Slotted hole X or Y

   (3) Bolt size

7. If you want to offset the slotted holes from the bolts so that the bolts are not in the middle of the holes, enter an offset value in the Slot offset box next to Slotted hole X and Slotted hole Y.
8. If needed, modify the other hole and bolt properties.
9. Create the holes the same way you would create a bolt group.

You can create tapped holes that have threads drilled in them.

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 checkboxes.

   

3. Next to Parts with special holes, indicate which plies of the connection get tapped holes by selecting the desired Special hole checkboxes.

   For example:

   

4. If you want to create similar holes in each of the tapped parts, select the Use the same settings for all special holes checkbox.

   The holes will be created using the properties of the holes in the first tapped part from the bolt head.

   If you clear this checkbox, you can define hole properties separately for each of the tapped parts.

5. In the Special hole type list, select Tapped.
6. In Core hole size, enter the predrilling hole size.

   Note that the core hole size does not affect the DSTV output. This value is only for marking and representation of the hole in the model and drawings.

7. If needed, modify the other hole and bolt properties.
8. Create the holes the same way you would create a bolt group.

When several parts are connected together with a bolt group or single bolt, you can create different holes in each of the parts. For example, the holes in one part can be slotted, and the holes in the other parts can be either special holes or regular round 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 get special holes by selecting the desired Special hole checkboxes.

   For example:

   

3. Clear the Use the same settings for all special holes checkbox.
4. For each of the parts with special holes, select an option in the Special hole type list.
5. Depending on the type of the special holes in each of the parts, enter the needed hole dimensions and other properties.
6. Create the holes the same way you would create a bolt group.