A lexicon of knife terminiology

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A lexicon of knife terminology: Section J
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J2 Tool steel:  A non-sensical term often applied to 420J2 Stainless Steel to make a person think they are buying a better quality knife. There is no such thing as J2 Tool Steel, the seller is referign to 420J2 stainless steel. While it is used to make some tools, it is not truly a "Tool Steel"

Jack: Any medium to large size folding knife, normally with one or two blades and relatively straight handles.  On a common two blade jack knife main blade is normally a clip or spear point and second blade a pen. Both blades are hinged at the top of the knife. Jack knives normally have bolsters on both ends but this is not always the case. Jack knives are normally over three inches long when closed Several knives make up the jack knife family. Such as the Barlow, Trapper, Folding Hunter, etc.. The Peanut is also a type of small jack knife

Jack Knife
A common one blade jack knife

Japanese Steel:  A non-descriptive term for stainless steel manufactured in Japan.  Unless specified it could mean anything.   The dealer is hoping you think it is at least AUS 6 Stainless steel.  A steel manufactured in Japan that is equivalent to 440 A Stainless steel. Unless specified it is meaningless. 

Jasper:  A stone material that comes in a variety of colors including red, yellow and green and may have a speckled appearance similar to turquoise. Because of its speckled nature, it is often incorrectly called red or yellow turquoise.   Jasper literally means spotted or speckled stone.  A certain type of green Jasper is also known as Bloodstone.  Jasper is often used in Native American and new age jewelry and is therefore sometimes used as a knife handle material

Jet Stone:  A stone made of Polished Lignite Coal.  The most common color used is black and thus it is sometimes called Black Jet. It is often used in Native American and new age jewelry and is therefore sometimes used as a knife handle material

Jig (Jigged):  To cut a pattern in to the handle material of a knife handle, normally to give it the appearance of stag.  This is often done with bone. Almost anytype of handle material can be jigged.

Jigged Bone:  a bone handle cut with jigging done to improve grip or imitate stag

Jimping: Small grooves cut in the spine of a blade or knife handle to provide a rough surface for thumb or finger placement and add to blade control.


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