Ruby Ball 21mm
ball 21mm
Bore Diameter:21 mm
Outside Diameter:21 mm
Width:21 mm
Weight:0.025 kg
The ball 21mm bearing is a Ruby ball with an inner diameter of 21 mm , an outer diameter of 21 mm, a width of 21 mm. It typically uses G5,G10,G20,G50,G100 grade precision tolerances and NO type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
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Detailed description
High precision artificial corundum bearings, ruby bearings, sapphire bearings, glass bearings, glass ceramic bearings, natural agate bearings, ruby nozzles, sapphire nozzles. Applicable to jewelry, handicrafts, clocks and watches and clothing, instruments and meters and other industries, the size of stone bearings can be customized according to customer requirements.
We offer high quality sapphire and ruby nozzles. The nozzle diameter ranges from 0.80mm to 18.00mm. The nozzle thickness ranges from 0.20mm to 15.00mm. The shape of the nozzle includes straight hole, conical straight hole, spherical straight hole, arc hole shape, etc.
We offer high quality corundum bearings, including sapphire bearings and ruby bearings. The bearing diameter is from 0.80mm to 10.00mm. The bearing thickness is from 0.20mm to 8.00mm. The shape of the bearing includes taper, sphere, straight hole, plane and so on.
Characteristics of artificial sapphire and ruby:
Chemical composition: Al2O3
Mohs hardness: 9
Density: 3.98-4.1g/cm3
Color: white and red
Melting point: 2050 degrees C
Softening point: 1800 degrees C
Expansion coefficient: parallel optical axis: 6.7 * 10-6/ degrees C
Vertical axis: 5 * 10-6/ degrees C
Coefficient of thermal conductivity: 0.09 cal/sec.cm. degrees C (25 degrees C)
Knoop hardness: parallel optical axis::1800
Vertical axis::2200
We provide high quality agate bearings, materials are natural agate. The diameter of the agate bearings is from 1.00mm to 10.00mm. The bearing thickness is from 1.00mm to 8.00mm. The shape of the bearing includes taper, sphere, ring, plane and so on.
Characteristics of natural agate:
Chemical composition: SiO2
Mohs hardness: 7.0-7.5
Density: 2.65g/cm3
Color: translucent white
Refractive index: 1.530-1.550
Crystalline structure: crystalline
Luster: wax
Softening point: 1600 degrees
High quality glass ceramics bearings, transparent glass bearings, glass ceramic bearings. The diameter of glass bearings ranges from 1.20MM to 3.00mm. The thickness of glass bearings ranges from 1.20MM to 2.00mm. The shape of the bearing includes taper, sphere, plane and so on.
Characteristics of glass ceramics:
Chemical composition: SiO2, Al2O3, Li2O, TiO2, ZrO2, CaO, etc
Mohs hardness: 6.5--6.7
Density: 2.7g/cm3
Color: milky white
Softening point: 1250 degrees C
A gem: strictly speaking, the gem refers to durable (Mohs hardness 6), color pure, good transparency, strong luster, meet the technical requirements of the natural nonmetallic minerals single crystal. The gems we refer to here are substitutes for natural gemstones, such as cubic zirconia, corundum, spinel, glass, etc, not natural gemstones in the strict sense.
Two, gem color: Ruby is the nature of the creature, with beautiful colors. Some are bright colored and some are colorful. The slight change in color can affect its value exponentially. Request its color is positive, pure color, color thick. Color is pure, pure color is flawless, color thick is eye-catching, the three complement each other, are indispensable. Artificial gem colors: white, black, yellow, deep yellow, light yellow, pink, red papaya, orange, red, purple, pomegranate green, olive green, apple green, blue, blue, purple, blue water and blue sapphire etc..
Three, the transparency of the gem: transparency refers to the performance of the material through the intensity of light, is one of the important criteria for testing the quality of gemstones. Color depth of transparency is weak, light or colorless, high transparency.
Four. The luster of Gemstones: the light that projects onto the surface of the gem is partly refracted and absorbed, and the other is reflected from the surface, which reflects the luster of the gemstone. All gems of different texture, hardness, light absorption and reflection of the degree is not the same, so the gloss is not a fenhua. Therefore, the luster of diamonds is particularly bright, and the luster of jade is especially nourishing. The quality is fine and hard, the luster must be good; the quality is rough and soft, and the luster must be poor. Gloss is also one of the important criteria for testing the quality of gemstones.
Five, the density of the gem: the density of the gem refers to the quality of the unit volume of gems, units are: gram/cm3. The density of common gems is shown below:
Gem name density (gram/cm3)
Diamond 3.52
Artificial red and sapphire 3.99
Cubic zirconia 5.80
Spinel 3.60
Topaz 3.53 ~ 3.56
Crystal 2.66
Glass 2.22
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