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Hardness comparison table. Brinell HB (10 mm Ball, 3000 kg load) Vickers HV (5 kg) Rockwell C HRC (120 degree cone 150 kg) Rockwell B HRB (1/16" ball 100 kg)
Toggle the table of contents. Hardnesses of the elements (data page) 10 languages. ... Mohs hardness of materials (data page) Vickers hardness test; Brinell scale
Two graphite pencils. Both are labelled "HB", but the numeric label differs between "2" and "2 1 ⁄ 2 ". A grading chart ranging from 9B to 9H. Graphite pencils are made of a mixture of clay and graphite and their darkness varies from black to light grey. A higher amount of clay added to the pencil makes it harder, leaving lighter marks.
The hardness may also be shown as XXX HB YYD 2. The XXX is the force to apply (in kgf) on a material of type YY (5 for aluminum alloys, 10 for copper alloys, 30 for steels). The XXX is the force to apply (in kgf) on a material of type YY (5 for aluminum alloys, 10 for copper alloys, 30 for steels).
Toggle the table of contents. Hardness scales. ... Hardness scales may also refer to: ... The scale of Pencil hardness
The Blackwing 602 is a pencil that is noted for its soft, dark graphite, unique flat square ferrule and replaceable eraser. It was manufactured by the Eberhard Faber Pencil Company from 1934 to 1988, then by the Faber-Castell pencil company from 1988 to 1994 and by Sanford from 1994 to 1998. [1] The pencil initially sold for 50 cents each.
A commonly-used mechanical pencil lead is identical in density, but not in thickness to a traditional HB (US#2) pencil lead. The hardness depends on the proportion of polymer or resin and graphite in the lead. [16] It is determined by a numerical scale: the higher the number, the harder the lead.
Ford-Cosworth HB engine, a Formula One racing engine; HB pencil (hard black), a classification of pencils; HB, a flammability rating as set forth in UL 94; Horizontal branch, in astrophysics; HB, a level in the Brinell scale hardness test
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