Mica Rounds | McMaster-Carr

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Material

Shape

System of Measurement

Diameter

Performance

Electrically Insulating

Length

Maximum Temperature

Color

Tensile Strength

Minimum Temperature

Thermal Conductivity @ Temperature

2.08 BTU⋅in/(hr⋅ft²⋅°F) @ 68° F

7.98 BTU⋅in/(hr⋅ft²⋅°F) @ 212° F

10.16 BTU⋅in/(hr⋅ft²⋅°F) @ 212° F

Not Rated

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Dielectric Strength

Clarity

Flexibility

REACH

RoHS

Wall Thickness

Maximum Continuous Temperature

930° F

1,290° F

1,470° F

Maximum Intermittent Temperature

Thermal Conductivity

Density

118 Products

Extra-High-Temperature Mica Washers

These washers won't melt, stick, or become brittle, even when exposed to temperatures as high as 1050° F. They make excellent insulators and are often used to secure electrical connections in transformers. Mica can chip and flake due to wear, however, so these washers are not recommended for high-vibration applications.

				Temp. Range
For Screw Size	ID	OD	Thk.	Min.	Max., ° F	Color	Pkg. Qty.		Pkg.
No. 0	0.072"	0.219"	0.004" to 0.006"	Not Rated	1,050	Beige	5	91619A200	00000
No. 2	0.098"	0.265"	0.001" to 0.003"	Not Rated	1,050	Beige	10	91619A300	0000
No. 3	0.109"	0.312"	0.004" to 0.006"	Not Rated	1,050	Beige	5	91619A400	0000
No. 4	0.118"	0.375"	0.001" to 0.003"	Not Rated	1,050	Beige	10	91619A500	0000
No. 6	0.156"	0.296"	0.001" to 0.003"	Not Rated	1,050	Beige	10	91619A600	0000
No. 8	0.176"	0.375"	0.004" to 0.006"	Not Rated	1,050	Beige	10	91619A700	0000
No. 10	0.195"	0.750"	0.004" to 0.006"	Not Rated	1,050	Beige	10	91619A800	0000

Extra High-Temperature Easy-Machine Glass-Mica Ceramic Rods

Also known as Macor, this glass-mica ceramic withstands temperatures up to 1470° F. You can machine complicated shapes and precision parts from it in a fraction of the time it would take using other types of fired ceramic. Its good electrical and thermal resistance make it a common choice for heating and soldering fixtures.

			Temp.								3" Lg.		6" Lg.		12" Lg.
Dia.	Dia. Tolerance	Color	Min.	Max., ° F	Fabrication	Performance	Dielectric Strength, V/mil	Porosity	Compressive Strength, psi	Hardness		Each		Each		Each



	1/8"	0.000" to 0.015"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K14	000000	8489K15	000000	8489K16	000000


	3/16"	0.000" to 0.015"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K17	00000	8489K18	00000	8489K19	00000
	1/4"	0.000" to 0.015"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K21	00000	8489K22	00000	8489K23	00000
	5/16"	0.000" to 0.015"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K74	00000	8489K75	00000	8489K76	000000
	3/8"	0.000" to 0.015"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K24	00000	8489K25	00000	8489K26	000000
	1/2"	0.000" to 0.015"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K27	00000	8489K28	00000	8489K29	000000
	5/8"	0.000" to 0.015"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K77	00000	8489K78	000000	8489K79	000000
	3/4"	0.000" to 0.015"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K131	00000	8489K132	000000	8489K133	000000
	7/8"	0.000" to 0.060"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K81	00000	8489K82	000000	8489K83	000000
	1"	0.000" to 0.060"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K31	000000	8489K32	000000	8489K33	000000
	1 1/2"	0.000" to 0.125"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K34	000000	8489K35	000000	8489K36	000000


	2"	0.000" to 0.125"	White	Not Rated	1,470	Fired	Easy Machine, Electrically Insulating, Extra High Temperature	1,140	13%	32,000	Rockwell A48	8489K37	000000	8489K38	000000	8489K39	000000

Easy-Machine Glass-Mica Ceramic Rods

Machine complicated shapes and precision parts from this glass-mica ceramic in a fraction of the time it would take using other types of fired ceramic. Its good electrical and thermal resistance make it a common choice for heating and soldering fixtures. Also known as Mykroy/Mycalex.

			Temp., ° F								3" Lg.		6" Lg.		12" Lg.
Dia.	Dia. Tolerance	Color	Min.	Max.	Fabrication	Performance	Dielectric Strength, V/mil	Porosity	Compressive Strength, psi	Hardness		Each		Each		Each



	1/4"	-0.005" to 0.005"	Gray	-330	930	Fired	Easy Machine, Electrically Insulating	530	13%	40,000	Rockwell H90	8499K614	000000	8499K514	000000	8499K331	000000


	3/8"	-0.005" to 0.005"	Gray	-330	930	Fired	Easy Machine, Electrically Insulating	530	13%	40,000	Rockwell H90	8499K616	00000	8499K515	00000	8499K332	00000
	1/2"	-0.005" to 0.005"	Gray	-330	930	Fired	Easy Machine, Electrically Insulating	530	13%	40,000	Rockwell H90	8499K618	00000	8499K518	00000	8499K333	00000
	5/8"	-0.005" to 0.005"	Gray	-330	930	Fired	Easy Machine, Electrically Insulating	530	13%	40,000	Rockwell H90	8499K619	00000	8499K519	00000	8499K334	000000
	3/4"	-0.005" to 0.005"	Gray	-330	930	Fired	Easy Machine, Electrically Insulating	530	13%	40,000	Rockwell H90	8499K623	00000	8499K521	00000	8499K335	000000
	1"	-0.005" to 0.005"	Gray	-330	930	Fired	Easy Machine, Electrically Insulating	530	13%	40,000	Rockwell H90	8499K625	00000	8499K525	000000	8499K336	000000
	1 1/4"	-0.005" to 0.005"	Gray	-330	930	Fired	Easy Machine, Electrically Insulating	530	13%	40,000	Rockwell H90	8499K627	00000	8499K527	000000	8499K337	000000

Electrically Insulating Mica Tubes

Insulate electrical components in environments exposed to high heat. These tubes are often used to support wire leads in electric vehicle batteries. They provide greater vibration resistance than ceramic and withstand higher temperatures than plastic. They can operate continuously at temperatures up to 930° F, but if they stay above that temperature for too long, they may turn to carbon and stop insulating. Also known as muscovite mica.

Rigid—Saw, score, or cut to length with standard tools.

Wall Thickness—The thicker the wall, the better a tube can withstand high voltages, resist crushing, and hold up to heat cycling. Thinner walls allow for some heat transfer and are easier to cut.

	OD	ID	Dielectric Strength, V/mil	Max. Continuous Temp., ° F	Max. Intermittent Temp., ° F	Flexibility		6" Long	12" Long	24" Long	36" Long
Made Outside the U.S.







				1/16" Thick Wall

				1/4"	1/8"	558	930	1,470	Rigid	5067K23	00000	00000	000000	000000


				3/8"	1/4"	558	930	1,470	Rigid	5067K24	0000	00000	00000	00000
				1/2"	3/8"	558	930	1,470	Rigid	5067K25	0000	00000	00000	00000
				5/8"	1/2"	558	930	1,470	Rigid	5067K26	0000	00000	00000	00000
				3/4"	5/8"	558	930	1,470	Rigid	5067K27	0000	00000	00000	00000
				1"	7/8"	558	930	1,470	Rigid	5067K28	0000	00000	00000	00000




						1/8" Thick Wall

						1/2"	1/4"	558	930	1,470	Rigid	5067K56	0000	00000	00000	00000


						5/8"	3/8"	558	930	1,470	Rigid	5067K57	0000	00000	00000	00000
						3/4"	1/2"	558	930	1,470	Rigid	5067K58	0000	00000	00000	00000
						1"	3/4"	558	930	1,470	Rigid	5067K59	0000	00000	00000	00000




								1/4" Thick Wall

								3/4"	1/4"	558	930	1,470	Rigid	5067K61	00000	00000	00000	00000


								1"	1/2"	558	930	1,470	Rigid	5067K62	00000	00000	00000	00000
								1 1/2"	1"	558	930	1,470	Rigid	5067K63	00000	00000	00000	00000
								2"	1 1/2"	558	930	1,470	Rigid	5067K64	00000	00000	00000	00000


								Made in the U.S.







												1/16" Thick Wall

												3/8"	1/4"	550	930	Not Rated	Rigid	5067K74	00000	00000	00000	00000


												1/2"	3/8"	550	930	Not Rated	Rigid	5067K75	00000	00000	00000	00000
												5/8"	1/2"	550	930	Not Rated	Rigid	5067K76	00000	00000	00000	00000
												3/4"	5/8"	550	930	Not Rated	Rigid	5067K77	00000	00000	00000	00000
												1"	7/8"	550	930	Not Rated	Rigid	5067K78	00000	00000	00000	00000




1/8" Thick Wall

1/2"	1/4"													550	930	Not Rated	Rigid	5067K86	00000	00000	00000	00000


5/8"	3/8"													550	930	Not Rated	Rigid	5067K87	00000	00000	00000	00000
3/4"	1/2"	550												930	Not Rated	Rigid	5067K88	00000	00000	00000	00000
1"	3/4"	550	930											Not Rated	Rigid	5067K89	00000	00000	000000	000000




		1/4" Thick Wall

		3/4"	1/4"											550	930	Not Rated	Rigid	5067K91	00000	00000	00000	00000


		1"	1/2"											550	930	Not Rated	Rigid	5067K92	00000	00000	00000	00000
		1 1/2"	1"											550	930	Not Rated	Rigid	5067K93	00000	00000	00000	000000
		2"	1 1/2"											550	930	Not Rated	Rigid	5067K94	00000	00000	000000	000000

Extra-High-Temperature Electrically Insulating Mica Tubes

Shield electrical parts in extremely hot areas, such as kilns and furnaces. These tubes maintain their insulating properties at extreme continuous operating temperatures, and can also withstand flashes of even hotter temperatures. However, if they stay above that temperature for too long, they may turn to carbon and stop insulating. They provide greater vibration resistance than ceramic and withstand higher temperatures than plastic. Also known as phlogopite mica.

Rigid—Saw, score, or cut to length with standard tools.

	OD	ID	Dielectric Strength, V/mil	Max. Continuous Temp., ° F	Max. Intermittent Temp., ° F	Flexibility		6" Long	12" Long	24" Long	36" Long
Made Outside the U.S.







				1/16" Thick Wall

				1/4"	1/8"	508	1,290	1,830	Rigid	5094N23	00000	00000	000000	000000


				3/8"	1/4"	508	1,290	1,830	Rigid	5094N24	0000	00000	00000	00000
				1/2"	3/8"	508	1,290	1,830	Rigid	5094N25	0000	00000	00000	00000
				5/8"	1/2"	508	1,290	1,830	Rigid	5094N26	0000	00000	00000	00000
				3/4"	5/8"	508	1,290	1,830	Rigid	5094N27	00000	00000	00000	00000
				1"	7/8"	508	1,290	1,830	Rigid	5094N28	0000	00000	00000	00000




						1/8" Thick Wall

						1/2"	1/4"	508	1,290	1,830	Rigid	5094N56	0000	00000	00000	00000


						5/8"	3/8"	508	1,290	1,830	Rigid	5094N57	0000	00000	00000	00000
						3/4"	1/2"	508	1,290	1,830	Rigid	5094N58	00000	00000	00000	00000
						1"	3/4"	508	1,290	1,830	Rigid	5094N59	00000	00000	00000	00000




								1/4" Thick Wall

								3/4"	1/4"	508	1,290	1,830	Rigid	5094N61	00000	00000	00000	00000


								1"	1/2"	508	1,290	1,830	Rigid	5094N62	00000	00000	00000	00000
								1 1/2"	1"	508	1,290	1,830	Rigid	5094N63	00000	00000	00000	000000
								2"	1 1/2"	508	1,290	1,830	Rigid	5094N64	00000	00000	00000	000000


								Made in the U.S.







												1/16" Thick Wall

												3/8"	1/4"	254	1,470	Not Rated	Rigid	5094N74	00000	00000	00000	000000


												1/2"	3/8"	254	1,470	Not Rated	Rigid	5094N75	00000	00000	00000	000000
												5/8"	1/2"	254	1,470	Not Rated	Rigid	5094N76	00000	00000	00000	000000
												3/4"	5/8"	254	1,470	Not Rated	Rigid	5094N77	00000	00000	00000	000000
												1"	7/8"	254	1,470	Not Rated	Rigid	5094N78	00000	00000	000000	000000




1/8" Thick Wall

1/2"	1/4"													254	1,470	Not Rated	Rigid	5094N86	00000	00000	00000	000000


5/8"	3/8"													254	1,470	Not Rated	Rigid	5094N87	00000	00000	00000	000000
3/4"	1/2"	254												1,470	Not Rated	Rigid	5094N88	00000	00000	000000	000000
1"	3/4"	254	1,470											Not Rated	Rigid	5094N89	00000	00000	000000	000000




		1/4" Thick Wall

		3/4"	1/4"											254	1,470	Not Rated	Rigid	5094N91	00000	00000	00000	000000


		1"	1/2"											254	1,470	Not Rated	Rigid	5094N92	00000	00000	00000	000000
		1 1/2"	1"											254	1,470	Not Rated	Rigid	5094N93	00000	00000	000000	000000
		2"	1 1/2"											254	1,470	Not Rated	Rigid	5094N94	00000	00000	000000	000000