Enter the diameter of the fastener (in) and the diameter of the fastener head (in) into the Calculator. The calculator will evaluate the Clearance Hole.
Clearance Hole Formula
CH = (DF + DH) / 2
Variables:
- CH is the Clearance Hole (in)
- DF is the diameter of the fastener (in)
- DH is the diameter of the fastener head (in)
To calculate the Clearance Hole, add the diameter of the fastener and the diameter of the head, then divide by 2.
How to Calculate Clearance Hole?
The following steps outline how to calculate the Clearance Hole.
- First, determine the diameter of the fastener (in).
- Next, determine the diameter of the fastener head (in).
- Next, gather the formula from above = CH = (DF + DH) / 2.
- Finally, calculate the Clearance Hole.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
diameter of the fastener (in) = 1.25
diameter of the fastener head (in) = 0.4
FAQs
What is a Clearance Hole and why is it important?
A Clearance Hole is a hole drilled into a material that is larger than the diameter of the fastener intended to pass through it. This allows the fastener to be inserted and removed easily without threading into the material itself, which is important for preventing damage to both the material and the fastener, and for ensuring proper alignment and fastening.
How do you determine the appropriate size for a Clearance Hole?
The appropriate size of a Clearance Hole can be determined using the formula CH = (DF + DH) / 2, where CH is the Clearance Hole size, DF is the diameter of the fastener, and DH is the diameter of the fastener head. The calculation ensures that the hole size accommodates both the shaft and the head of the fastener for easy insertion.
Can the Clearance Hole formula be used for all types of fasteners?
While the provided formula offers a general guideline for calculating Clearance Hole sizes, it is important to consider the specific requirements of the project and the type of fasteners being used. Different materials and fastener types may require adjustments to the formula to ensure a proper fit.
What tools are needed to create a Clearance Hole?
Creating a Clearance Hole typically requires a drill and an appropriately sized drill bit. The size of the drill bit should be chosen based on the calculated size of the Clearance Hole. Additionally, measuring tools such as calipers may be needed to accurately measure the diameters of the fastener and its head.
