If you own a Puma knife, you may have noticed a tiny hole or impression on the blade. This is the “Rockwell point“. Puma checks all of its folding and fixed blade knives for their Rockwell hardness according to the system Rockwell C. You can ensure your knife has undergone this test by looking at the blade – there should be a “RC” imprinted on the blade near the knife’s number.
The Rockwell C test is conducted by taking a diamond cone and pressing it into a blade under a fixed amount of force followed by an increased amount of force. The diamond’s penetration depth after these two forces are applied is measure and the resulting measure is the hardness rating of the steel. A good steel blade should rate somewhere between HRC 50 and 65. This procedure is used on all sorts of metals types.