Genuine Makita Set Plate / chisel clamp — part #345328-2. This is the pair of steel clamp plates used to secure the planer knives to the cutter drum on Makita 312 mm planers. It’s sold as the two-piece clamp set used in the KP312 family and the KP312S parts breakdown, so it’s the exact replacement if your knife clamps are bent, stripped or missing.
What it does: these clamp plates hold the HSS knives (blades) against the cutter drum, keeping blade seating and alignment correct so you get an even, chatter‑free cut across the full 312 mm planing width. If clamps are damaged you’ll see uneven planing, looseness or vibration — replacing them restores correct blade retention.
Fits / compatibility: fits Makita KP312 (12-1/4", 312 mm) and the KP312S variant as shown in the Makita parts breakdowns and parts lists. Check your model label — if it’s a KP312/KP312S this is the matching Makita clamp set.
(Part references and fitment shown in Makita parts diagrams and supplier listings for KP312.)
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