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Formula: Al₂O₃
Form: Bolt
Material: Aluminum Oxide
CAS Number: 1344-28-1
Commodity: Ceramics
Size: M5 x 30mm
Pitch: 0.8mm
Standard: ANSI B18.6.7M-1985
Alumina Flat Slotted Bolt offers a unique combination of exceptional hardness, thermal stability, and corrosion resistance, making it ideal for extreme environments where metallic fasteners would fail. High-purity alumina provides outstanding electrical insulation and maintains mechanical integrity at elevated temperatures, ensuring reliability in demanding applications. This component finds widespread use in industries such as aerospace, high-temperature manufacturing, semiconductor processing, and chemical engineering. Specific uses include securing components in thermal processing chambers, fastening insulating structures in electrical assemblies, and supporting high-vacuum apparatus where contamination-free fastening is essential. Its role in advanced technology development stems from alumina’s capacity to withstand aggressive thermal cycling, resist chemical degradation, and provide dielectric stability, enabling researchers and engineers to push performance boundaries. In both industrial production and scientific instrumentation, this bolt delivers long-term stability and operational safety under conditions that challenge conventional materials.
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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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