Hole Sizes#

Using standards to my your life easier.

Typically hole sizes are defined by diameter, which is the full across dimension of a circle

Hole types#

There are multiple kinds of holes that are often used.

Through Holes

  • Holes that are drilled all the way "through" a piece of material
  • Typically used for something to fit inside it like a bolt, rivet, or bearing

Blind Holes

  • Holes that are only drilled partially through a material

Tapped Holes

  • Through holes, or Blind holes that have been "tapped", to add internal threads
  • These threads allow screws to be screwed in
  • Commonly used on thunderhex

Countersunk Holes

  • Holes with a conical, opening to allow countersunk hardware to fit flush with the material face
  • Commonly used to house countersunk bolts

Holes are typically drilled out made by hand drills, drill presses, mills, or routers

Some common drill bit sizes we use are:

  • 3/16" (0.1875")
  • 5/32" (0.15625")
  • 1/4" (0.25")
  • 3/8" (0.375")

Each hole has a certain diameter corresponding to its purpose.

Example

A hex bearing has a 1.125" OD (Outer diameter) so the its hole to fit in would be 1.125"