Description
The KDM680C air drill is the air-powered motor that mounts to the Chem-Set Keep-Nut KDM115 and KDM115A drilling machines, providing the rotational power needed to bore clean, dimensionally accurate anchor holes in granite, quartz, porcelain, and other engineered slab materials. Used by stone fabricators, sink installers, and panel anchor specialists, this drill body is engineered for the controlled hole geometry the Keep-Nut threaded insert system depends on.
Where the KDM680C air drill fits in the Keep-Nut system
The Keep-Nut self-anchoring fastener system relies on a precise undercut hole profile that standard handheld rotary tools cannot reliably produce. The KDM115 drilling machine, with the air drill installed and paired with the KN-KDM52 vacuum base, fixes the bit position and feed rate, delivering hole tolerances suitable for direct anchor seating. Fabricators producing undermount sinks, panel-to-stone attachments, and threaded inserts in countertop edges use this combination daily across granite, engineered quartz, and porcelain substrates.
How the KDM680C air drill holds up in production
Air-driven motors run cooler than electric equivalents during repetitive hole drilling cycles, which matters when batch-drilling for kitchen counter shops or panel anchor installations. The motor is rated for sustained shop air supply at standard CFM and pressure, and the housing accepts the Keep-Nut bit collet without an adapter. Replacement is straightforward when service intervals come up, and the unit pairs back into the existing KDM115 frame without retooling.
Specifications
| Spec | Value |
|---|---|
| Drive type | Pneumatic (shop air) |
| Compatible base | KDM115, KDM115A |
| Compatible vacuum fixture | KN-KDM52 |
| Substrates | Granite, quartz, porcelain, engineered stone |
| Bit interface | Keep-Nut collet |
To order the KDM680C air drill or other Keep-Nut drilling system components, browse our Keep-Nut threaded inserts and accessories. For application techniques and bond strength demonstrations across stone and panel anchoring, see the Chemical Concepts YouTube channel.
Need Help?
Need help spec’ing the drilling setup for your Keep-Nut application? Call (800) 220-1966 or email [email protected].
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