Planer & Jointer Knives

High-speed steel (HSS) knives are the traditional choice—economical, sharpenable, and suitable for most domestic hardwoods and softwoods. Carbide-tipped knives cost more upfront but hold an edge far longer, particularly in abrasive exotic hardwoods, teak, and figured species, and they are especially practical in production environments where frequent knife changes are disruptive.

Signs that knives are dull include increased tearout on the planed surface, visible mill marks or ridges that weren't present before, burning or scorching of the wood surface, and the machine requiring noticeably more effort to feed stock. Rotating or replacing knives at the first signs of dullness produces better results than waiting until quality deteriorates severely.

Yes. The Infinity Tools Replacement Planer Knives for DeWalt DW735 are dimensioned as drop-in replacements for the OEM knives and require no modification for installation. The same applies to the DW734 version.

Most benchtop and mid-size planers and jointers use two, three, or four knives depending on the cutterhead design and machine size. Check your tool's owner's manual or the manufacturer's specifications to determine the correct knife count and dimensions before ordering.

Yes. HSS planer and jointer knives can be sharpened on a flat honing stone, diamond plate, or a dedicated knife-grinding jig to restore a sharp edge. The number of times a knife can be sharpened depends on its initial thickness and how much material is removed each time.

The 1/8" thick carbide-tipped knives are designed for cutterheads that accept the 1/8" blade profile. Using the correct thickness is critical for proper seating in the cutterhead and safe, accurate cutting—always verify the required knife thickness against your machine's specifications.

Most planer and jointer knife changes require only basic hand tools—typically a hex key or wrench to loosen the gib screws that hold the knife in place. A setting jig or dial indicator is helpful for setting knife height consistently above the cutterhead after installation. Follow your machine's manual for the correct procedure.

Yes. Infinity Tools stands behind the quality of its manufactured products. See the quality guarantee page for details or contact the team with any questions.

Yes. If you find a lower price on a comparable product, Infinity Tools offers price matching on eligible items. Visit the price matching page for full details.

The Infinity Tools woodworking learning center covers machine setup, knife installation, and technique for getting the best results from your planer and jointer.