- Replacement Parts
- Additional Knurls
- Shipping & Returns
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.
Select the knurl(s) of your choice in the drop-down menu above.*
*NOTE: Each knurl is an additional cost.
Always wear safety glasses when operating machine tools.
Bump Knurling Tool demonstrated by guest craftsman, Jerry Kieffer
|Body Material||6061 T6 Aluminum|
|Body Coating||Black Anodized|
|Knurling Wheel Material||High Speed Steel|
|Max Diameter Knurling Capacity||1″ (25mm)|
|22750||Bump Knurl Holder Body|
|36030||(4) .381 x .030 Washer (ID .190″)|
|36040||(2) 3/16″ x 3/4″ Dowel Pin|
|40520||(2) 10-32 x 3/16″ Cup Point Set Screw|
|Knurling tool(s) of your choice (not included)|
|90° 40TPI Straight Knurl||3618A||$24.50||Purchase|
|90° 41TPI Straight Knurl||3619A||$24.50||Purchase|
|90° 47TPI Straight Knurl||3620A||$24.50||Purchase|
|70° 50TPI Straight Knurl||3622A||$24.50||Purchase|
|70° 53TPI Straight Knurl||3623A||$24.50||Purchase|
|70° 60TPI Straight Knurl||3624A||$24.50||Purchase|
|70° 70TPI Straight Knurl||3625A||$24.50||Purchase|
|70° 80TPI Straight Knurl||3626A||$24.50||Purchase|
|90° 25TPI Male Diamond Knurl||3627||$42.00||Purchase|
We do not charge a flat rate for shipping because of the variations in weight for our products. Instead we charge you what the shipping company charges us. Our website uses a shipping calculator based on the daily rates for USPS and UPS based on the weight and destination of the shipment. You can also have us use your UPS/FedEx account number to charge your shipping to. Just enter it in the appropriate box on the checkout page.
Domestic orders are shipped Monday – Friday. Expedited orders must be placed by 9 am PST to ship the same day.
Orders shipping ground have a processing time of 7 working days for domestic orders and 14 working days for international orders. Click here for more information on our shipping and order policies.
Most merchandise can be returned within 30 day of the purchase date. A refund will be issued to the original form of payment at the original selling price. View our complete return policy and/or start your return online here.