Technical Product Specifications

Precision and Quality Specified

itp uses only the highest precision, highest quality spheres available in the range of Grade 3 to Grade 5

	Ruby spheres	Ceramic spheres	Silicon nitride spheres	Zirconia oxide spheres
Material	Synthetic ruby monocrystal Al₂O₃	Aluminum oxide polycrystal >99,9 Al₂O₃	Silicon nitride polycrystal SI₃N₄	Zirconia oxide ZrO₂ polycrystal
Form deviation¹	0,08µm - 0,13µm	0,08µm - 0,13µm	0,08µm - 0,13µm	0,08µm - 0,13µm
Diameter deviation	0,08µm - 0,13µm	0,08µm - 0,13µm	0,08µm - 0,13µm	0,08µm - 0,13µm
Roughness Ra	0,007µm - 0,008µm	0,007µm - 0,008µm	0,004µm - 0,005µm	0,007µm - 0,008µm
Hardness	2400 Vickers	2100 Vickers	1600 Vickers	1200 Vickers
Density	3,99 g/cm³	3,85 g/cm³	3,20 g/cm³	6,05 g/cm³
Thermal expansion	5,4•10^-6K^-1	8,8•10^-6K^-1	2,9•10^-6K^-1	10,5•10^-6K^-1
Compression strength (MPa)	2100	3800	3000	2000
Bending strength (MPa)	400	470	>1000	700 - 1100
Fracture toughness (MN/m^3/2)	1	4	>6,5	10

* As per DIN 5401 ISO 3290 & AFBMA 3290, Sphere Standards
¹ From AFBNA Grade 3 to Grade 5

	Material	Hardness	Density
Titanium	3,7035 Grade 2	150 Brinell	4,5 g/cm³
Stainless Steel	1,4305	300 Vickers	7,95 g/cm³
Tungsten Carbide	DK 120	1700 Vickers	15,0 g/cm³
Ceramic	Alsint 99,7	9 nach Mohs	3,85 g/cm³
Carbon Fiber	Bending strength > 450 GPa CTE (Coefficient of thermal expansion) -0,4 x 10^-61/K

Sphere diameter. Drilled sphere peg mounted for all diameters starting from 0,5 until 30,0 mm.

Stem diameter

Stem material

Base

Thread M2 - M6

Measuring length

Total length