HSS changeable Pilot Counterbore Set 21pcs Tool short style 5/16″-5/8″ Shank 1″
Set including following Sizes:
* short style, 6 counterbores 5/16″ -5/8″, including: 5/16, 3/8, 7/16, 1/2, 9/16, 5/8
* 14 pilots 0.187-7/16″, including: 0.187, 0.204, 0.213, 0.229, 1/4, 11/64, 9/32, 5/16, 21/64, 11/32, 25/64, 3/8, 13/32, 7/16
* 1 straight shank holder.
What is a counterbore pilot?
Counterbores are rotary cutting tools with a pilot tip to guide cutting lips into the hole. They are used to form a recess for a capscrew head or to enlarge a hole without changing its relative position. They are available in a variety of styles and sizes for specific applications.
What are the main types of counterbore?
These configurations include aircraft counterbores, cap screw counterbores, fillister head screw counterbores, blade counterbores, and back counterbores.
What is the purpose of a counterbore?
Counterbores are flat-bottomed enlargements at the base of a cylindrical bore. They’re used to enlarge the opening of an existing hole and hold the fastener. The hole is meant to prevent two workpieces from separating and contain the fastener.
How fast do you run a counterbore?
Although you will find specific cutting speeds for countersinking and counterboring, a simple rule of 1/3 the speed of a drill of the same size will work for most countersinking and counterboring operations.