A 10 cm hole is almost 4 inches ! ! - IF you meant 10mm, then that's a little over 3/8 of an inch, or 13/32 for a clearance hole.
The thinnest drill bit available for purchase is typically around 0.0135 inches in diameter, also known as a 80 drill bit.
For all practical purposes an 8mm drill is equal to 5/16 inch.
The recommended 5 drill bit size for drilling holes in metal is 0.2055 inches in diameter.
12mm
There are 25.4 millimetres in one inch. Therefore, rounded to two decimal places, 8 millimetres is equal to 8 / 25.4 = 0.31 inches.
A number 10 drill bit refers to a drill bit size in the U.S. numbering system, which is commonly used for small diameter holes. Specifically, a number 10 drill bit has a diameter of approximately 0.1935 inches (4.9 mm). It is often used in woodworking, metalworking, and for creating pilot holes for screws. The exact size can vary slightly depending on the specific drill bit manufacturer.
For a 10mm Rawl bolt, you typically need to use a drill bit that is slightly smaller than the bolt's diameter to ensure a snug fit. The recommended drill bit size is usually 8-9mm, depending on the type of Rawl bolt and the material you are drilling into. Always check the manufacturer's specifications for the specific bolt you are using, as requirements may vary.
Drill bits not only come in fractional number sizes they also come in letter sizes. The F size drill bit is .257 thousandths of an inch in diameter. A 1/4 inch drill bit is .250 thousandths of an inch in diameter, so size F is .007 thousandths of an inch bigger than a 1/4 inch drill bit.
.50196850"
Depends on the diameter of the conduit. Try for 1/4" larger diameter drill bit.
.0995"
For a 16mm drill, the appropriate size pilot hole typically ranges from 10mm to 12mm in diameter, depending on the material and the specific application. A pilot hole that is slightly smaller than the drill bit diameter helps to guide the drill and reduce friction. Always refer to the manufacturer's guidelines for specific recommendations based on the type of drill and material being used.