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Formula: Al₂O₃
Form: Bolt
Material: Aluminum Oxide
CAS Number: 1344-28-1
Commodity: Ceramics
Size: M3 x 5mm
Pitch: 0.5mm
Standard: ANSI B18.3.1M-1986 (R2008)
Alumina Socket Bolt exhibits exceptional hardness, high compressive strength, and remarkable resistance to wear and corrosion, making it suitable for demanding mechanical and thermal environments. Its low electrical conductivity and outstanding chemical inertness enable reliable performance in both high-purity and harsh chemical settings. Primary applications include aerospace, high-vacuum technology, advanced manufacturing, and semiconductor industries, where precision fastening in extreme conditions is essential. Specific uses range from securing components in high-temperature furnace assemblies to providing stable connections in corrosive processing equipment and insulating fixtures in plasma chambers. In research and innovation, alumina’s stability and machinability in complex shapes allow engineers to design high-performance fastening solutions that maintain integrity under severe thermal cycling and mechanical stress. Alumina Socket Bolt holds substantial value in both scientific and industrial contexts by ensuring long-term reliability and performance in critical fastening applications.
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Tolerances

Bolt
Size See Item

Material Properties for Ceramics

Chemical Resistance
Element Value
Acids - concentrated Good
Acids - dilute Good
Alkalis Good
Halogens Good
Metals Good
Electrical Properties
Element Value
Dielectric constant 9-10.1
Dielectric strength( kV mm⁻¹ ) Oct-35
Volume resistivity( Ohmcm ) >10¹⁴@25
Physical Properties
Element Value
Apparent porosity( % ) 0
Water absorption - saturation( % ) 0
Density( gcm⁻³ ) 3.9
Thermal Properties
Element Value
Melting point( C ) 2100
Upper continuous use temperature( C ) 1700
Specific heat( J K⁻¹ kg⁻¹ ) 850-900@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 26-35@20°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 8@20-1000°C
Mechanical Properties
Element Value
Tensile modulus( GPa ) 300-400
Hardness - Knoop( kgf mm⁻² ) 2100
Hardness - Vickers( kgf mm⁻² ) 1500-1650
Shear strength( MPa ) 330
Tensile strength( MPa ) 260-300
Pultrusions
Element Value
Compressive strength( MPa ) 2200-2600

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