Counterbores are used to enlarge a preformed hole when a flat bottom is required or to spotface when a machine finish is required. The counterbore is an end cutting tool which may utilize a pilot to align the enlarged hole being machined with the preformed hole. Capscrew counterbores have non-removable pilots.
![](https://www.supertoolinc.com/wp-content/uploads/2022/10/list5778-300x195.jpg)
![](https://www.supertoolinc.com/wp-content/uploads/2023/02/list5778-300x195.jpg)
5778
Counterbores - Straight Shank - For Steel
41
![](https://www.supertoolinc.com/wp-content/uploads/2023/02/list5779-300x195.jpg)
5779
Counterbores - Straight Shank - For Non-Ferrous & Cast Iron
61
![](https://www.supertoolinc.com/wp-content/uploads/2023/02/list5780-300x49.jpg)
5780
Counterbores - Tapered Shank - For Non-Ferrous & Cast Iron
61
![](https://www.supertoolinc.com/wp-content/uploads/2023/02/list5781-300x49.jpg)
5781
Counterbores - Tapered Shank - For Steel
41
![](https://www.supertoolinc.com/wp-content/uploads/2023/02/list9513-300x142.jpg)
9513
Capscrew Counterbores - Straight Shank - For Non-Ferrous & Cast Iron
38
![](https://www.supertoolinc.com/wp-content/uploads/2023/02/list9515-300x142.jpg)
9515
Capscrew Counterbores - Straight Shank - For Steel
38
![](https://www.supertoolinc.com/wp-content/uploads/2023/02/list9522-300x114.jpg)
9522
Reduced Shank Counterbores - Right Hand Helix - For Non-Ferrous
41