Description
The Chem-Set Keep-Nut porcelain drill bit is a manual diamond bit for drilling Keep-Nut anchor holes in porcelain, ceramic, and sintered stone. It mounts on the KDM115 drilling machine or on a polisher or grinder with a matching thread. Manual Keep-Nut drilling comes down to four things: the right bit for the material, water at the cutting edge, the right depth for the anchor size, and a Go/No-Go check before the anchor goes in.
Key Product Details
| Property | Value |
|---|---|
| Part Number | CCH-KNBITGRI-11.4-D |
| Brand | Chem-Set |
| Bit Type | Manual diamond drill bit |
| Diameter | 0.449 in (11.4 mm) |
| Thread | 5/8-11, female |
| Materials | Porcelain, ceramic, sintered stone |
| Used With | KDM115 Manual Drilling Machine, or freehand with a polisher or grinder (freehand not recommended) |
| Recommended Speed | 3500 to 4000 RPM |
| Cooling | Water required |
| Stop Collar | Sold separately, used for freehand drilling only |
| Hole Depth | Set by Keep-Nut size, see the depth table below |
| Packaging | Each |
Performance in Production
- Run water at the bit. Chem-Set’s manual drilling instructions call for it to hold accurate hole dimensions.
- Set the polisher or machine to 3500 to 4000 RPM before the bit touches the surface.
- Porcelain and sintered stone get their own bit. The instructions recommend a different bit than the natural stone bit for materials like Dekton and Neolith, and this is the 11.4 mm bit for them.
- On the KDM115, the built-in depth stop controls depth. The stop collar is only for freehand work, and it is sold separately.
- Start the hole at about 45 degrees, then pivot the bit to 90 degrees once it has a seat. Use low to moderate pressure and do not try to widen the hole.
- Check the bottom of the hole with the Go/No-Go gauge. A hole drilled by hand can run slightly wide or out of round at the top, and the anchor needs the right size at the bottom.
Common Applications
- Undermount sink anchor holes in porcelain and sintered stone countertops
- Keep-Nut anchor holes in Dekton, Neolith, and Lapitec slabs
- Anchor holes in porcelain stoneware, including Sapienstone and Crossville
- Anchor holes in ceramic panels
- Shop or on-site drilling where a CNC router is not available
- Jobsite hole prep with a KDM115 or a polisher
Available Sizes
- 11.4 mm manual bit, 5/8-11 female thread, each: CCH-KNBITGRI-11.4-D
Related Products
- Keep-Nut Go/No-Go Gauge for checking hole diameter and depth
- Keep-Nut Setting Tool for seating the anchor
- KDM115 Keep-Nut Drilling Machine
- Keep-Nut Manual Drill Bit, 11.4mm (CCH-KNBITGRI-11.4MM) for natural stone and quartz
- Keep-Nut CNC Drill Bit, 11.8mm (CCH-KNBITCNC-11.8-D) for porcelain and sintered stone on a CNC router
- Specialinsert EVO Manual Drill Bit, 11.5mm for all surfaces
How Manual Keep-Nut Hole Drilling Works
Manual drilling is a repeatable process when the setup is right. These are the shop steps for porcelain, ceramic, and sintered stone.
- Pick the bit by material. This 11.4 mm bit is for porcelain, ceramic, and sintered stone. Natural stone and quartz use CCH-KNBITGRI-11.4MM.
- Choose how you will hold the bit. The KDM115 is the recommended setup. A polisher or grinder works freehand, but we do not recommend it.
- Set the depth for your Keep-Nut size using the table below. On the KDM115, use the adjustment dial with a Keep-Nut as a reference. Freehand, set the stop collar about 0.06 in (1.6 mm) deeper than the hole depth. For an IM2S that is roughly 0.31 in (8 mm) from the cutting edge.
- Turn on the water and set the speed to 3500 to 4000 RPM. Drill a test hole in scrap and check it with the Go/No-Go gauge.
- Start the hole at about 45 degrees, pivot to 90 degrees, and drill with low to moderate pressure until the depth stop or collar reaches the surface.
- Clear the debris with compressed air. The Go side of the gauge 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) |
Frequently Asked Questions
What drill bit do I use for Keep-Nut anchors in porcelain?
Use this 11.4 mm diamond bit by hand or on the KDM115, or the 11.8 mm CNC version on a router. Both are listed for porcelain, ceramic, and sintered stone.
Can I use the natural stone Keep-Nut bit on Dekton or Neolith?
Use this bit instead. Our manual drilling instructions recommend a different bit for porcelain and sintered stone such as Dekton and Neolith, and this 11.4 mm bit is the one listed for those materials. The natural stone and quartz version is CCH-KNBITGRI-11.4MM.
Does the Keep-Nut drill bit come with a stop collar?
No. The stop collar is a separate item, and you only need it for freehand drilling. The KDM115 has its own built-in depth stop. Call (800) 220-1966 and we will get you the right collar.
What RPM should I run a Keep-Nut diamond bit at?
Chem-Set recommends 3500 to 4000 RPM with water at the bit. Water is required to hold accurate hole dimensions.
How deep do I drill for a Keep-Nut?
It depends on the Keep-Nut size. The hole depth table above lists each one. Freehand, set the stop collar a little deeper than that figure, as described in the steps.
Can I drill Keep-Nut holes freehand with a polisher?
You can, but we do not recommend it. If you do, use this 11.4 mm bit to compensate for wobble, set a stop collar, and check every hole with the Go/No-Go gauge.
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 Keep-Nut drilling setup? Call (800) 220-1966 or email [email protected].
Keep-Nut is a registered trademark of Specialinsert. Dekton, Neolith, Lapitec, Sapienstone, and Crossville are trademarks of their respective owners.
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