Bump Knurl Tool Holder

About the Bump Knurl Tool Holder

Our bump knurl holder was designed primarily so customers who have CNC machines could add a knurling operation to their program, but it can also be used on a manual lathe. This holder is the same style that is used on full-sized CNC machines. It is held in position using the 3/8″ Insert Holder Tool Post (P/N 7600, not included).

P/N 2275 Bump Knurl Tool Holder shown engaged with a part.

Knurl size limitations with the Bump Knurl Tool

There are limitations to the knurl size and method of holding your part: Knurls from 40 TPI (threads per inch) and higher will work well on our machine. Coarser knurls from 32 TPI and lower will not work well. The exception to the rule is the diamond knurl. Because the diamond knurl is a male pattern, it can cut a larger TPI, so the 25 TPI that we offer is fine.

The bump knurl tool will handle stock diameters up to 1/2″ (12.5 mm), while it is turned in the lathe, creating a knurled pattern.

NOTE: The knurling tool was not designed for use with riser blocks.

Other size knurls for spiral, straight, or diamond patterns are also available.

Select the knurl(s) of your choice in the drop-down menu above.*

*NOTE: Each knurl is an additional cost.