More about Threaded Holes

The topic provides reference information about threaded holes.

The following topics are discussed:

Related Topics
Creating Threaded Holes

Thread Types

The Type box in the Hole Definition dialog box lets you choose among these thread types:


  • No Standard
  • Metric Thin Pitch: uses ISO standard values
  • Metric Thick Pitch: uses ISO standard values
No Standard

If you select No Standard, the following boxes are available:


  • Thread Diameter
  • Hole Diameter
  • Thread Depth
  • Hole Depth
  • Pitch

You just need to enter the values you need in these boxes.

Note that a number of contextual commands are available from these boxes. For example, Edit formula... lets you define formulas for managing diameters values.

Metric Thin Pitch: ISO Standard
Refer to ( ISO 965-2 ). The application uses the minimum standard values.
Nominaldiam Pitch Minordiam
8.0 1.0 6.917
10.0 1.0 8.917
10.0 1.25 8.647
12.0 1.25 10.647
12.0 1.5 10.376
14.0 1.5 12.376
16.0 1.5 14.376
18.0 1.5 16.376
18.0 2.0 15.835
20.0 1.5 18.376
20.0 2.0 17.835
22.0 1.5 20.376
22.0 2.0 19.835
24.0 2.0 21.835
27.0 2.0 24.835
30.0 2.0 27.835
33.0 2.0 30.835
36.0 3.0 32.752
39.0 3.0 35.752
42.0 3.0 38.752
45.0 3.0 41.752
48.0 3.0 44.752
52.0 4.0 47.67
56.0 4.0 51.67
60.0 4.0 55.67
64.0 4.0 59.67
Metric Thick Pitch: ISO Standard
Nominaldiam Pitch Minordiam
1 0.25 0.729
1.2 0.25 0.929
1.4 0.3 1.075
1.6 0.35 1.221
1.8 0.35 1.421
2.0 0.4 1.567
2.5 0.45 2.013
3.0 0.5 2.459
3.5 0.6 2.850
4.0 0.7 3.242
5.0 0.8 4.134
6.0 1.0 4.917
7.0 1.0 5.917
8.0 1.25 4.917
10.0 1.5 8.376
12.0 1.75 8.376
14.0 2.0 11.835
16.0 2.0 11.835
18.0 2.5 11.835
20.0 2.5 17.294
22.0 2.5 19.294
24.0 3.0 20.752
27.0 3.0 23.752
30.0 3.5 23.752
33.0 3.5 23.752
36.0 4.0 31.670
39.0 4.0 34.670
42.0 4.5 37.129
45.0 4.5 40.129
48.0 5.0 42.587
52.0 5.0 46.587
56.0 5.5 50.046
60.0 5.5 54.046
64.0 6.0 57.505

Reusing Values Already Defined in a File

To access values listed in a .xml file, the system administrator must have made the data required available. For reference information, see Creating Thread Standards.

If this step has been done, you just need to select the file from the Type list, and optionally edit one or more values (Thread Depth and Hole Depth) if needed.

Important:
  • You can modify a standard on the fly. But if the standard has already been used (i.e a design table was created) the modification is not taken into account in the Hole Definition and Thread Definition dialog boxes.
  • While selecting a standard thread type in the Type field:

    • If the diameter of a hole set by you in the Extension tab complies with the thread standards, the related thread description is automatically selected as per the thread standards.

      For example, if you enter 12.376mm in the Hole Diameter field and then select Metric Thin Pitch as thread type, the related parameter M14X1.5 corresponding to the 12.376mm hole diameter appears in the Thread Description field as selected.

    • If the diameter of a hole set by you in the Extension tab does not exist in the standard file, a warning message is displayed. In this case, the diameter is set to the first value in the standard file.

      For example, if you enter 15mm in the Hole Diameter field and then select Metric Thick Pitch as thread type, a warning message appears informing you that the value 15mm does not exist in the selected standard and that the diameters will be set with the first line of the standard.

Bottom Type

You can use a planar geometrical element as limiting thread/tap depth element or set the thread depth with the length of the support.

The Bottom Type frame provides three different options to set depth:

  • Dimension: The depth is set through numerical value in the dialog box using Thread Depth.
  • Support Depth: The depth of the thread is automatically set to the height of the support.
  • Up-To-Plane: The depth is computed with the selected bottom limit element

The Bottom Limit selection option manages the limit bottom element. This option is available with the type Up-To-Plane. It has a contextual menu in order to create planar element on the fly. The Thread Depth box will get disabled with the selection of Up-To-Plane or Support Depth option.

The limit bottom element must be planar and parallel to the limit face.

Threading Counterbored Holes

The thread depth value you enter to thread counterbored holes does not apply to the counterbored part of the hole. The thread depth for counterbored holes corresponds to the distance shown by the yellow arrow on the help image:



Threading Tapered Holes

You can thread tapered holes in the same way as you thread any other hole types. Once you have selected a tapered hole, the image in the dialog box assists you:



The following figure illustrates how the different parameters you need to value are defined:

User Features and Power Copies

User Features do not support standards used in the definition of thread features.