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The Janka hardness test results tabulated below followed ASTM D 1037-12 testing methods. Lumber stocks tested range from 1" to 2" (25–50 mm) thick. The tabulated Janka hardness numbers are an average. There is a standard deviation associated with each species, but these values are not given. [citation needed] No testing was done on actual ...
Carya tomentosa, commonly known as mockernut hickory, mockernut, white hickory, whiteheart hickory, hognut, bullnut, is a species of tree in the walnut family Juglandaceae. The most abundant of the hickories , and common in the eastern half of the United States, it is long lived, sometimes reaching the age of 500 years.
Hickory (Carya) nuts and walnut nuts, both in the family Juglandaceae, grow within an outer husk; these fruit are sometimes considered to be drupes or drupaceous nuts, rather than true botanical nuts. "Tryma" is a specialized term for such nut-like drupes.
Carya texana (called black hickory for its dark colored bark, or Texas hickory) is a North American tree in the walnut family, Juglandaceae. It is endemic to the United States , found primarily in the southern Great Plains and the Lower Mississippi Valley .
Carya laciniosa, the shellbark hickory, in the Juglandaceae or walnut family is also called kingnut, big, bottom, thick, or western shellbark, attesting to some of its characteristics. It is a slow-growing, long-lived tree, hard to transplant because of its long taproot, and subject to insect damage.
Carya ovata var. ovata (northern shagbark hickory) has its largest leaflets over 20 cm (8 in) long and nuts 3–4 cm (1 + 1 ⁄ 8 – 1 + 5 ⁄ 8 in) long. Carya ovata var. australis (southern shagbark hickory or Carolina hickory) has its largest leaflets under 20 cm (8 in) long and nuts 2–3 cm (3 ⁄ 4 – 1 + 1 ⁄ 8 in) long.
The nine or ten genera in the family have a total of around 50 species, [3] and include the commercially important nut-producing trees walnut (Juglans), pecan (Carya illinoinensis), and hickory (Carya). The Persian walnut, Juglans regia, is one of the major nut crops of the world.
A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .
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