Uses for a Pocket Knife

documenting the many uses for the common pocket knife

Tightening Pocket Knife Blade

Allen Wrench or Hex Key Set

Tightening your pocket knife blade from time to time will be required in order to maintain long term functioning of your beloved pocket knife.  In order to avoid malfunction or possible injury, you should check your pocket knife frequently for any sign of loosening, or movement in the blade that is not normal.  To perform this maintenance, most likely you’ll need a simple set of tools such as the hex key tool set pictured above.  Other knives may use different pivot screw types such as a star, or rivet.

To tighten your pocket knife blade locate the bolster (or part of the knife where the handle meets the blade) and the pivot screw holding the bolster and the blade together.  Tighten the pivot screw and blade function by turning the wrench clockwise.  To loosed, turn the screw counter-clockwise.

Start by turning the screw only a small amount, as the blade may be too difficult to unfold if you over-tighten.

An optional step is to apply knife oil to the pivot screw in order to maintain smooth operation.  Once you apply the oil, close and open the pocket knife several times in order to work the oil in.  Wipe off the excess oil with a rag.

Pocket Knife Blade Tightening Videos

I found a decent video showing various pocket knives and the process for tightening or loosening the blade on each. Shot with some level of professionalism, this instructive video by Lawrence Coyne is sure to inform.

I can’t say I can endorse this technique of pocket knife blade play adjustment, but thenextarcher doesn’t want to pay $3 for shipping to have the factory fix it so this blunt force trauma approach will have to suffice.

Update 2/28/2015: Added new videos.

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  1. robert says:

    I have these knives that I that I have bought off of eBay. Mostly spring assisted blade knives of course made in china. They have different size hex screws(some of which are loose as I received them. I have tried tightening the screws with metric and SAE hex wrenches, but none seem to fit. Are there “off”,”in between” sizes that these manufacturers use or something?