Alumina Nut

Formula: Al₂O₃

Form: Nut

Material: Alumina

CAS Number: 1344-28-1

Commodity: Ceramics

Standard: ASME B18.2.4.1M-2002 (R2007)

The Alumina Nut is a product within Goodfellow's range of ceramic bolts. With 38 variations, this nut is made of alumina (aluminum oxide), an extremely hard ceramic material. Alumina has excellent corrosion and wear resistance along with high strength and stiffness at elevated temperatures. These properties make Alumina Nuts suitable for applications in harsh environments like automotive engines and chemical processing equipment where high temperature oxidation resistance is critical. The Goodfellow range of Alumina Nuts provides options to select the optimal size and thread specifications for different assembly and fastening needs.

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Technical Data Sheet Safety Data Sheet Tolerance Properties

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Tolerances

Nut

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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Alumina Nut

Tolerances

Material Properties for Ceramics