E-Z LOK Knife Thread inserts for hard wood
  • Superior holding power in hard woods
  • Inch (coarse/fine) and metric sizes
  • Available in brass and stainless steel
  • Install with screwdriver, bolt/jam nut, or optional drive tool.

Knife Thread inserts are designed for use in hard woods, like oak, cherry, and maple. Ideal for use wherever assembly or disassembly could lead to thread erosion or stripping, Knife Thread inserts use a proprietary external “knife” thread to slice into wood and provide superior holding power.

Knife Thread inserts are machined out of brass with internal thread sizes range from #4 to 3/8 and M3 to M8. If additional corrosion resistance is needed, Knife Thread inserts with 8-32, 10-24, and 1/4-20 internal threads are available in stainless steel.

Typical applications for Knife Thread inserts include furniture, cabinetry, partitions, and shipping containers. To install the insert, simply drill a hole and thread the insert into place using a screwdriver, bolt/jam nut, or optional drive tool.

For particularly hard wood – or if there is difficulty getting the insert to thread-in straight – a drive tool can be made with full thread engagement for maximum control during installation.

  • Cut the head off a bolt with a thread corresponding to the insert internal thread (round off the cut end for safety).
  • Thread two nuts onto the bolt, followed by the insert (slotted end down).
  • Put the bolt into a hand drill or drill press.
  • Prior to installing, make sure the two nuts are threaded down to the top of the insert.
  • Thread in the insert.
  • Loosen the nuts and back out the driver.

Important Note: Hole size requirements may vary depending on a number of factors, including material and tools. We recommend that you test your particular application before ordering. We gladly supply free samples.