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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/m3/2)

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

itpstyli drawing map
DK
Sphere diameter. Drilled sphere peg mounted for all diameters starting from 0,5 until 30,0 mm.
DS
Stem diameter
Stem material
  • Carbide / Carbide tube
  • Ceramic
  • Stainless Steel
  • Carbon Fiber
  • Titanium tube
DG
Base
Thread M2 - M6
  • M2 = 3 mm
  • M3 = 4 mm
  • M4 = 7 mm
  • M5 = 10 mm compatible Renishaw
  • M5 = 11 mm compatible Zeiss
  • M5 = 12 mm compatible Leitz
  • M6 = 16 mm
ML
Measuring length
L
Total length