Description
The Chem-Set Keep-Nut CNC porcelain drill bit is an 11.8 mm diamond bit with a 1/2 GAS male thread for drilling Keep-Nut anchor holes in porcelain, ceramic, and sintered stone on automated CNC routers. CNC is the preferred method for precise, consistent Keep-Nut holes in stone and porcelain. The setup comes down to speed, feed, cooling, and a hole depth that matches the Keep-Nut height.
Key Product Details
| Property | Value |
|---|---|
| Part Number | CCH-KNBITCNC-11.8-D |
| Brand | Chem-Set |
| Bit Type | CNC diamond drill bit |
| Diameter | 0.465 in (11.8 mm), tolerance +/- 0.2 mm |
| Thread | 1/2 GAS, male |
| Materials | Porcelain, ceramic, sintered stone |
| Used With | Automated CNC routers |
| Suggested Speed | 4500 to 5000 RPM |
| Feed Rate | 0.375 to 0.75 in/min maximum, or the slab manufacturer’s recommendation when available |
| Cooling | Spindle and halo cooling advised |
| Hole Depth | Matches Keep-Nut height, see the depth table below |
| Packaging | Each |
Performance in Production
- Hold the spindle in the suggested 4500 to 5000 RPM range and keep the hole inside the 0.2 mm diameter tolerance.
- Use both spindle and halo cooling. The Drill Bit Guide advises both on this bit.
- Feed rate tops out at 0.375 to 0.75 in/min. The slab manufacturer’s recommendation takes priority when they publish one.
- Program the hole depth to match the Keep-Nut height so the insert sits flush. Depth changes with the Keep-Nut size, so check the table below.
- Porcelain and sintered stone take a different bit than natural stone and quartz. This is the white bit. The natural stone and quartz bit is blue.
- Check hole diameter and depth with the Go/No-Go gauge before the anchor goes in.
Common Applications
- Undermount sink anchor holes drilled in the CNC program
- Keep-Nut holes in sintered stone slabs such as Dekton, Neolith, and Lapitec
- Keep-Nut holes in porcelain slabs such as Sapienstone, Crossville, Florim, and Infinity
- Anchor holes in other porcelain and sintered stone brands, including GEOLUXE, DuraLosa, Laminam, Maxfine, and Fiandre
- Production work where hole position and depth need to repeat from slab to slab
- Anchor holes for interior panels and cladding in porcelain and sintered stone
Available Sizes
- 11.8 mm CNC bit, 1/2 GAS male thread, each: CCH-KNBITCNC-11.8-D
Related Products
- Keep-Nut Go/No-Go Gauge for checking hole diameter and depth
- Keep-Nut Setting Tool for seating the anchor
- Keep-Nut CNC Drill Bit, 11.8mm (CCH-KNBITCNC-11.8MM) for natural stone and quartz
- Keep-Nut Manual Drill Bit, 11.4mm (CCH-KNBITGRI-11.4-D) for porcelain and sintered stone without a CNC
- Specialinsert EVO CNC Drill Bit, 11.5mm for all surfaces
How CNC Keep-Nut Hole Drilling Works
A CNC router drills every Keep-Nut hole to the same position and depth. These are the shop steps for porcelain, ceramic, and sintered stone.
- Pick the bit by material. This white 1/2 GAS bit is for porcelain, ceramic, and sintered stone. Natural stone and quartz use the blue bit, CCH-KNBITCNC-11.8MM.
- Mount the bit in the router’s 1/2 GAS tooling.
- Program the hole position and set the depth to match the height of your Keep-Nut. Use the table below.
- Set the spindle to 4500 to 5000 RPM and turn on both spindle and halo cooling.
- Set the feed rate within the maximum for this bit, or to the slab manufacturer’s recommendation if they publish one.
- Drill, clear the debris, and check the hole with the Go/No-Go gauge. The Go side should fit snugly and the No-Go side should not enter. If the No-Go side fits, the hole is too wide.
- Thread the Keep-Nut onto the setting tool and tap it in with a rubber mallet until it is fully seated and flush.
| Keep-Nut Size | Hole Depth |
|---|---|
| IM1S (H5) | 0.217 in (5.5 mm) |
| IM2S (H6) | 0.256 in (6.5 mm) |
| IM4S (H8.5) | 0.335 in (8.5 mm) |
| IM4S (H15) | 0.610 in (15.5 mm) |
Watch the CNC router installation video for a Keep-Nut install in porcelain.
Frequently Asked Questions
What CNC drill bit do I use for Keep-Nut anchors in porcelain or sintered stone?
Use the 11.8 mm 1/2 GAS white bit, CCH-KNBITCNC-11.8-D. It is the CNC bit listed for porcelain, ceramic, and sintered stone. Natural stone and quartz use the blue bit, CCH-KNBITCNC-11.8MM.
What RPM and feed rate do I run for Keep-Nut holes in porcelain?
Run 4500 to 5000 RPM with spindle and halo cooling. Keep the feed within the maximum listed in the table, or follow the slab manufacturer’s recommendation when they publish one.
Can I use the natural stone CNC bit on Dekton or Neolith?
Use this white bit instead. Our Drill Bit Guide lists this bit for sintered stone and porcelain and the blue bit for natural stone and quartz, so match the bit to the material.
Which porcelain and sintered stone brands is this bit for?
It is for porcelain, ceramic, and sintered stone, including Dekton, Neolith, Lapitec, Sapienstone, Crossville, Florim, Infinity, GEOLUXE, DuraLosa, Laminam, Maxfine, and Fiandre. If your slab is not on that list, call us before you program the job.
How deep do I program the hole for a Keep-Nut?
Match the depth to the Keep-Nut size so the insert sits flush. The hole depth table above lists each size.
Is there a manual version of this bit?
Yes. The 11.4 mm manual bit runs on the KDM115 or a polisher and is also listed for porcelain, ceramic, and sintered stone.
How is this different from the Specialinsert EVO CNC bit?
They are separate parts. The EVO CNC bit is 11.5 mm with a 1/2 GAS male thread and is listed for all surfaces. This bit is 11.8 mm and is listed for porcelain, ceramic, and sintered stone.
How do I know the hole is the right size?
Use the Go/No-Go gauge. The Go side should fit snugly and the No-Go side should not enter. If the No-Go side fits, the hole is too wide.
Questions on fit for your CNC Keep-Nut setup? Call (800) 220-1966 or email [email protected].
Keep-Nut is a registered trademark of Specialinsert. Dekton, Neolith, Lapitec, Sapienstone, Crossville, Florim, Infinity, GEOLUXE, DuraLosa, Laminam, Maxfine, and Fiandre are trademarks of their respective owners.
Reviews
There are no reviews yet.