Kreg 90-Degree Corner Clamp (KHCCC) Review

The KHCCC holds two boards at a right angle while you screw, nail or glue them, which sounds like a one-line job description because it mostly is. What separates it from a $12 basic corner clamp is Kreg’s Automaxx mechanism: set the clamping pressure once with the thumbwheel, and every squeeze of the handle closes to that same pressure automatically, rather than you guessing how hard to crank a screw each time.

The cast-aluminum V-pad and wedge pad self-square against the workpiece edges, so you are not nudging boards into alignment while also trying to keep pressure on. For a cabinet box or drawer with four corners to get square and glued before anything shifts, that speed matters more than it sounds like it should.

The genuinely clever bit is the cutout machined into the clamp body — it lines up with where a pocket-hole screw needs to go, so you can drive the screw through the joint without unclamping first. On a box with several corners, that is the difference between clamp-drive-unclamp-repeat and just working down the joint.

Where it gives ground: it is not cheap, and most jobs need more than one. A basic four-corner box glue-up wants four of these if you are doing it properly, which turns a $50 clamp into a $200 outlay before you have built anything. It is also heavier than a simple bar clamp of similar capacity, which you notice on anything held at an angle or overhead rather than flat on a bench.

Maximum material thickness is 1 inch, which covers the plywood and hardwood stock most cabinet and box work uses, but rules it out for anything thicker without packing.