Clearance Hole
A clearance hole is large enough so the threads of a screw or bolt can pass through the hole, but not large enough for the head of the screw or bolt to pass through. It is often used to join two parts.
This example shows the upper part of two parts being joined. A clearance hole is made in the upper part so an M5 bolt can pass through it to the lower part. You can see the lower part in the related topic Tapped Hole.
1. To place the hole:
a. On the Placement tab, with the Placement collector active, click the top surface at the location you want the hole.
b. Click the Offset References collector, and do the following:
i. Click the RIGHT datum plane, click the arrow next to Offset, and select Align.
ii. Hold down the CTRL key while you click the FRONT datum plane, then click the arrow next to Offset, and select Align.
2. On the Hole tab, under Type, click 
Standard.
Standard.3. Under Profile, click 
Clearance.
Clearance.4. Under Size:
a. Next to 
Thread type, select ISO.
Thread type, select ISO.b. Next to 
Screw size, select M5x.8.
Screw size, select M5x.8.5. To prevent the head of the bolt from protruding:
a. Under Profile, click 
Counterbore.
Counterbore.b. Click the Shape tab, and enter a counterbore 
diameter value.
diameter value.c. Enter a value for the counterbore height.
6. Click 
OK.
OK.