SOG Specialty Knives & Tools F09N-CP Hand Axe Straight Edge 2.4-Inch Steel Blade

 

SOG Specialty Knives & Tools F09N-CP Hand Axe Straight Edge 2.4-Inch Steel Blade Video


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Blade Type Information: 420 Stainless Steel

420 is the numerical designation for a grade of stainless steel. The 400 series includes ferritic and martensitic chromium alloys, with 420 specifically referring to Cutlery Grade martensitic, which is similar to Brearley's original rustless steel and possesses excellent polishability.

Type 420 Stainless Steel, a modification of 410, has a higher carbon content to increase hardness, improve strength and give better wear resistance. Type 420 Stainless Steel provides both corrosion resistance as well, and is commonly used in dental and surgical instruments, cutlery, plastic molds, pump shafts, steel balls, and numerous hand tools.

Type 420 resists corrosion by the atmosphere, fresh water, steam, carbonic acid, crude oil, gasoline, perspiration, alcohol, ammonia, mercury , sterilizing solutions, soaps and other similar corrosives.

Handle Material Information: G-10 Laminate

Micarta is the brand name for composites of linen, canvas, paper, fiberglass, carbon fiber or other fabric in a thermosetting plastic originally used in electrical and decorative applications. Micarta was developed by George Westinghouse in 1910 using resins invented by Leo Baekeland. These resins were used to impregnate paper and cotton fabric which were cured under pressure and high temperature to produce laminates. In the years following, this manufacturing method began to include the use of fiberglass fabric and other resin types.

Modern Micarta laminates are produced with a wide variety of resins and fibers. The term is now used generically to describe most resin impregnated fibre compounds. The largest use for Micarta laminates is a high strength electrical insulation in power generating and distribution equipment. The laminates are also used for knife handles and handgun grips, guitar fingerboards and bridges, pool cues, and safety gear such as hard hats.

A G-10 micarta is resin impregnated fiberglass. Such a handle is unlikely to shatter or crack and won't absorb liquid or chemicals its surface layers. It's also resistant to showing dirt or hand oil marks.

Rockwell Hardness: HRC 51-53

The SOG Specialty Knives & Tools F09N-CP Hand Axe Straight Edge 2.4-Inch Steel Blade has a Rockwell Hardness of HRC 51-53

Stanley P. Rockwell inevnted the Rockwell Hardness Test in 1919 while working as a metallurgist in ball bearing plant. Rockwell wanted to measure the uniformity and hardness of inner and outer rings on which the ball bearings rolled. He designed a device that could measure hardness accurately and quickly.

The American Society for Testing and Materials (ASTM) standardized a set of scales for testing Rockwell hardness values. Each scale has been designated a letter and corresponds to a different group of materials. Scale C is used for steel, titanium, deep case hardened steel, hard cast irons and other materials harder than scale B 100.

Knife blades and other steel hardened tools are made from metals that match to the Rockwell C scale. Most blade makers display the hardness number as "HRC xx" or "HRC xx - xx" providing a range, where "xx" indicates a Rockwell hardness number. Not many blades measure over HRC 70. Most functional blades rate somewhere between HRC 56 and HRC 63.

Generally, blades with a lower HRC number don't hold and edge for long under demanding use, but they are easier to sharpen. Blades with a higher HRC value stay sharp for longer, but are more difficult to sharpen. As an example, stainless steel has a HRC higher than carbon steel, but it is also more difficult to sharpen than carbon steel.

Company Information: SOG Specialty Knives

SOG Specialty Knives, Incorporated, commonly known as SOG, is a United Staes knife and tool manufacturing company famous for their reproduction SOG Knife from the Vietnam era. SOG currently manufactures a variety of knives, multi-tools, and tactical tomahawks and more. The company was founded in 1986 by Spencer and Gloria Frazer, with its name inspired by the Joint Services Special Operations unit known as the Military Assistance Command, Vietnam Studies and Observations Group (MACV-SOG) who developed their own knife during the War in Vietnam.

SOG Specialty Knives manufactures a variety of tools for military personnel and consumers. SOG also makes additional military style knives, including a tactical switchblade which is only available to military/law enforcement. SOG has developed fixed blade knives and tactical tomahawks for survival and outdoors. SOG also manufactures multi-tools including the Paratool, PowerLock, and PowerAssist.

Many of SOG's folding knives and multi-tools are made or assembled in the USA, with the higher priced folders and fixed blades being made in Seki, Japan. Some of SOG's lesser priced tools, such as the Fusion line are manufactured in Taiwan or China.

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