Corundum | McMaster-Carr

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Shape

System of Measurement

Length

Diameter

Thickness

Maximum Temperature

Width

Porosity

Thermal Conductivity @ Temperature

159 BTU⋅in/(hr⋅ft²⋅°F) @ 68° F

171 BTU⋅in/(hr⋅ft²⋅°F) @ 68° F

4.5 BTU⋅in/(hr⋅ft²⋅°F) @ 212° F

194.5 BTU⋅in/(hr⋅ft²⋅°F) @ 212° F

Dielectric Strength

Compressive Strength

Hardness

Tensile Strength

Density

Export Control Classification Number (ECCN)

1C007

EAR99

DFARS Specialty Metals

REACH

RoHS

Flexural Strength

Modulus of Elasticity

Refractive Index

Wall Thickness

Number of Bores

Sphericity Percentage

226 Products

Nonporous Alumina Ceramic Tubes

Color: White
Max. Temperature: 3075° F
Fabrication: Fired
Porosity: 0%
Compressive Strength: 300,000 psi

Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.

For technical drawings and 3-D models, click on a part number.

				6" Lg.		12" Lg.		24" Lg.
OD	ID	Wall Thick.	Compressive Strength, psi		Each		Each		Each
0.050"	0.020"	0.015"	300,000	00000000	000000	00000000	000000	00000000	000000
0.063"	0.031"	0.016"	300,000	00000000	00000	00000000	00000	00000000	00000
0.094"	0.040"	0.027"	300,000	00000000	00000	00000000	00000	00000000	00000
0.094"	0.063"	0.016"	300,000	00000000	00000	00000000	00000	00000000	00000
0.100"	0.050"	0.025"	300,000	00000000	00000	00000000	00000	00000000	00000
1/8"	0.063"	0.031"	300,000	00000000	00000	0000000	00000	00000000	00000
0.156"	0.094"	0.031"	300,000	00000000	00000	0000000	00000	00000000	00000
0.187"	0.094"	0.047"	300,000	00000000	00000	0000000	00000	00000000	00000
0.187"	1/8"	0.032"	300,000	00000000	00000	0000000	00000	00000000	00000
0.219"	0.156"	0.031"	300,000	0000000	00000	00000000	00000	00000000	00000
1/4"	1/8"	0.063"	300,000	00000000	00000	0000000	00000	00000000	00000
1/4"	0.156"	0.047"	300,000	00000000	00000	0000000	00000	00000000	00000
1/4"	0.188"	0.031"	300,000	00000000	00000	0000000	00000	00000000	00000
0.313"	0.188"	0.063"	300,000	00000000	00000	00000000	00000	00000000	00000
0.313"	0.219"	0.047"	300,000	00000000	00000	00000000	00000	00000000	00000
3/8"	1/4"	0.063"	300,000	00000000	00000	0000000	00000	00000000	00000
0.438"	0.313"	0.063"	300,000	00000000	00000	00000000	00000	00000000	00000
1/2"	1/4"	0.125"	300,000	00000000	00000	0000000	00000	00000000	00000
1/2"	3/8"	0.063"	300,000	00000000	00000	0000000	00000	00000000	000000
0.590"	0.394"	0.098"	300,000	0000000	00000	0000000	00000	00000000	00000
0.590"	0.433"	0.078"	300,000	00000000	00000	00000000	00000	00000000	000000
5/8"	1/2"	0.063"	300,000	00000000	00000	0000000	00000	00000000	00000
0.688"	1/2"	0.094"	300,000	00000000	00000	00000000	00000	00000000	000000
3/4"	1/2"	0.125"	300,000	00000000	00000	0000000	00000	00000000	000000
3/4"	0.563"	0.094"	300,000	00000000	00000	00000000	00000	00000000	000000
7/8"	5/8"	0.125"	300,000	00000000	00000	00000000	000000	00000000	000000
1"	3/4"	0.125"	300,000	00000000	000000	00000000	000000	00000000	000000

Nonporous Alumina Ceramic Multiple-Bore Tubes

Two Bores

Four Bores

Color: White
Max. Temperature: 3075° F
Fabrication: Fired
Porosity: 0%
Compressive Strength: 300,000 psi

Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.

For technical drawings and 3-D models, click on a part number.

			6" Lg.		18" Lg.		24" Lg.
Number of Bores	OD	ID		Each		Each		Each
2	0.063"	0.016"	00000000	000000	00000000	000000	000000	00
2	0.094"	0.025"	00000000	00000	00000000	00000	00000000	000000
2	0.109"	0.031"	00000000	00000	00000000	00000	00000000	00000
2	0.125"	0.031"	00000000	00000	00000000	00000	00000000	00000
2	0.125"	0.040"	00000000	00000	00000000	00000	00000000	00000
2	0.156"	0.052"	00000000	00000	00000000	00000	00000000	00000
2	0.188"	0.040"	00000000	00000	00000000	00000	000000	00
2	0.188"	0.047"	00000000	00000	000000	00	000000	00
2	0.188"	0.063"	00000000	00000	00000000	00000	00000000	00000
2	0.200"	0.052"	00000000	00000	00000000	00000	000000	00
2	0.240"	0.078"	00000000	00000	00000000	00000	00000000	00000
2	0.250"	0.063"	00000000	00000	00000000	00000	00000000	00000
4	0.063"	0.016"	00000000	00000	000000	00	000000	00
4	0.085"	0.024"	00000000	00000	000000	00	00000000	000000
4	0.094"	0.020"	00000000	00000	000000	00	000000	00
4	0.109"	0.020"	00000000	00000	00000000	00000	00000000	00000
4	0.188"	0.031"	00000000	00000	00000000	00000	00000000	00000
4	0.188"	0.047"	00000000	00000	00000000	00000	00000000	00000
4	0.219"	0.050"	00000000	00000	00000000	00000	00000000	00000
4	0.258"	0.078"	00000000	00000	00000000	00000	00000000	00000

Nonporous Alumina Ceramic Sheets and Bars

Color: White
Max. Temperature: See table
Fabrication: Fired
Electrical Properties: 4 1/2" × 4 1/2" sheets are electrical insulating
Dielectric Strength: See table
Porosity: 0%
Compressive Strength: 300,000 psi

Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.

For technical drawings and 3-D models, click on a part number.

Sheets

Thick.	Thick. Tolerance	Wd.	Lg.	Max. Temperature, °F	Dielectric Strength, V/mil		Each
0.010"	-0.001" to 0.001"	4 1/2"	4 1/2"	3100°	250	0000000	000000
0.015"	-0.002" to 0.002"	4 1/2"	4 1/2"	2910°	210	0000000	00000
0.020"	-0.002" to 0.002"	4 1/2"	4 1/2"	2910°	210	0000000	00000
0.025"	-0.006" to 0.006"	4 1/2"	4 1/2"	3100°	250	0000000	00000
0.030"	-0.003" to 0.003"	4 1/2"	4 1/2"	2910°	210	0000000	00000
0.035"	-0.004" to 0.004"	4 1/2"	4 1/2"	2910°	210	0000000	00000
0.040"	-0.004" to 0.004"	4 1/2"	4 1/2"	2910°	210	0000000	00000
0.060"	-0.002" to 0.002"	4 1/2"	4 1/2"	3100°	250	0000000	000000
0.080"	-0.002" to 0.002"	4 1/2"	4 1/2"	3100°	250	0000000	000000
0.100"	-0.008" to 0.008"	4 1/2"	4 1/2"	3100°	250	0000000	000000
0.157"	-0.050" to 0.050"	2"	4 1/4"	3075°	220	0000000	000000
0.177"	-0.050" to 0.050"	3"	6 1/4"	3075°	220	0000000	000000
0.197"	-0.050" to 0.050"	4"	8 1/2"	3075°	220	0000000	000000

Bars

					12" Lg.
Thick.	Thick. Tolerance	Wd.	Max. Temperature, °F	Dielectric Strength, V/mil		Each
0.125"	-0.004" to 0.004"	1/8"	3075°	220	00000000	000000
0.250"	-0.008" to 0.008"	1/4"	3075°	220	00000000	00000

Nonporous Alumina Ceramic Rods and Discs

Color: White
Max. Temperature: 3075° F
Fabrication: Fired
Porosity: 0%
Compressive Strength: 300,000 psi

Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.

For technical drawings and 3-D models, click on a part number.

Rods

		6" Lg.		12" Lg.
Dia.	Dia. Tolerance		Each		Each
1/16"	-0.001" to 0.001"	00000000	000000	00000000	000000
1/8"	-0.004" to 0.004"	00000000	00000	00000000	00000
3/16"	-0.006" to 0.006"	00000000	00000	00000000	00000
13/64"	-0.012" to 0.000"	000000	00	00000000	00000
1/4"	-0.008" to 0.008"	00000000	00000	00000000	00000
5/16"	-0.009" to 0.009"	000000	00	00000000	00000
3/8"	-0.011" to 0.011"	00000000	00000	00000000	00000
1/2"	-0.015" to 0.015"	00000000	00000	00000000	00000
5/8"	-0.031" to 0.031"	00000000	00000	00000000	000000
3/4"	-0.039" to 0.039"	00000000	00000	00000000	000000

Discs

Dia.	Dia. Tolerance	Lg.		Each
1"	-0.050" to 0.050"	1/16"	0000000	000000
2 1/2"	-0.125" to 0.125"	1/8"	0000000	00000
6"	-0.180" to 0.180"	3/16"	0000000	000000

Nonporous Alumina Ceramic Balls

Color: White
Max. Temperature: 2000° F
Fabrication: Fired
Porosity: Not Rated
Compressive Strength: 300,000 psi

Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.

For technical drawings and 3-D models, click on a part number.

Dia.	Dia. Tolerance	Sphericity		Each
1/8"	-0.0001" to 0.0001"	99.9975%	0000000	00000
3/16"	-0.0001" to 0.0001"	99.9975%	0000000	0000
1/4"	-0.0001" to 0.0001"	99.9975%	0000000	0000
5/16"	-0.0001" to 0.0001"	99.9975%	0000000	0000
3/8"	-0.0001" to 0.0001"	99.9975%	0000000	0000
1/2"	-0.0001" to 0.0001"	99.9975%	0000000	0000
5/8"	-0.0010" to 0.0010"	99.99%	0000000	00000
3/4"	-0.0010" to 0.0010"	99.99%	0000000	00000
1"	-0.0010" to 0.0010"	99.99%	0000000	00000
3mm	-0.0001" to 0.0001"	99.99%	0000000	0000
4mm	-0.0001" to 0.0001"	99.99%	0000000	0000
16mm	-0.0001" to 0.0001"	99.99%	0000000	00000
20mm	-0.0001" to 0.0001"	99.99%	0000000	00000
25mm	-0.0001" to 0.0001"	99.99%	0000000	00000

Tight-Tolerance Nonporous Alumina Ceramic Rods

Color: White
Max. Temperature: 3075° F
Fabrication: Fired
Porosity: 0%
Compressive Strength: 300,000 psi

Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.

For technical drawings and 3-D models, click on a part number.

		12" Lg.		24" Lg.		36" Lg.
Dia.	Dia. Tolerance		Each		Each		Each
1/16"	-0.001" to 0.001"	0000000	000000	000000	00	000000	00
5/64"	-0.001" to 0.001"	0000000	00000	000000	00	000000	00
1/8"	-0.001" to 0.001"	0000000	00000	0000000	0000000	0000000	0000000
3/16"	-0.001" to 0.001"	0000000	00000	000000	00	0000000	000000
1/4"	-0.001" to 0.001"	0000000	00000	0000000	000000	0000000	000000
3/8"	-0.001" to 0.001"	0000000	000000	0000000	000000	0000000	000000
1/2"	-0.001" to 0.001"	0000000	000000	0000000	000000	000000	00

Nonporous Alumina Ceramic Beads

Color: White
Max. Temperature: 3075° F
Fabrication: Fired
Porosity: 0%
Compressive Strength: 300,000 psi

Often used as wire insulation. Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.

For technical drawings and 3-D models, click on a part number.

OD	ID	Lg.	Pkg. Qty.		Pkg.
0.090"	0.040"	1/8"	5	00000000	00000
0.170"	0.065"	0.188"	5	00000000	00000
0.330"	0.133"	0.313"	5	00000000	00000

Ultra-High-Temperature Easy-to-Machine Alumina Ceramic Sheets

Color: White
Max. Temperature: 3000° F
Fabrication: Fired
Porosity: 48%
Compressive Strength: 4,350 psi

Commonly used in induction furnace components and hot glass handling, this alumina ceramic withstands higher temperatures than alumina-bisque ceramic. The 99% alumina content makes it suitable for high-vacuum applications. It has excellent machinability. Material comes fired and is unaffected by water.

For technical drawings and 3-D models, click on a part number.

3" × 3"
Thick.	Thick. Tolerance		Each
1/32"	-0.020" to 0.020"	00000000	000000
1/16"	-0.020" to 0.020"	00000000	00000
1/8"	-0.035" to 0.035"	00000000	00000
3/16"	-0.040" to 0.040"	00000000	00000
1/4"	-0.050" to 0.050"	00000000	00000
1/2"	-0.065" to 0.065"	00000000	000000
6" × 6"
1/32"	-0.020" to 0.020"	00000000	000000
1/16"	-0.020" to 0.020"	0000000	000000
1/8"	-0.035" to 0.035"	0000000	000000
3/16"	-0.040" to 0.040"	000000	000000
1/4"	-0.050" to 0.050"	0000000	000000
1/2"	-0.065" to 0.065"	0000000	000000
12" × 12"
1/32"	-0.020" to 0.020"	00000000	000000
1/16"	-0.020" to 0.020"	00000000	000000
1/8"	-0.035" to 0.035"	00000000	000000
3/16"	-0.040" to 0.040"	00000000	000000
1/4"	-0.050" to 0.050"	00000000	000000
1/2"	-0.065" to 0.065"	00000000	000000
24" × 24"
1/16"	-0.020" to 0.020"	00000000	000000
1/8"	-0.035" to 0.035"	00000000	000000
3/16"	-0.040" to 0.040"	00000000	00000000
1/4"	-0.050" to 0.050"	00000000	00000000
1/2"	-0.065" to 0.065"	00000000	00000000

Ultra-High-Temperature Easy-to-Machine Alumina Ceramic Rods

Color: White
Max. Temperature: 3000° F
Fabrication: Fired
Porosity: 48%
Compressive Strength: 4,350 psi

For technical drawings and 3-D models, click on a part number.

		12" Lg.
Dia.	Dia. Tolerance		Each
1/2"	-0.063" to 0.063"	0000000	0000000
3/4"	-0.063" to 0.063"	0000000	000000
1"	-0.063" to 0.063"	0000000	000000
1 1/2"	-0.063" to 0.063"	0000000	000000