Oval Thermocouple Tubes | Ceramic Thermocouple Insulators

Du-Co Ceramics manufactures precision oval thermocouple tubes designed to provide dependable electrical insulation and protection for thermocouple wires in high-temperature environments. Available in steatite and cordierite materials, these two-hole ceramic insulators separate and protect thermocouple conductors while helping maintain accurate temperature measurements. Standard lengths of 1″, 2″, and 3″ are available, and custom lengths can be manufactured to meet specific application requirements.

Click on dimension header to list by size

Part No.	OD	OD 2	2 Hole	Material
O-58	0.144	0.091	0.042	Steatite
O-23	0.144	0.091	0.028	Steatite
O-31	0.156	0.094	0.046	Steatite
O-65	0.160	0.086	0.043	Cordierite
O-61	0.171	0.117	0.050	Cordierite
O-21	0.172	0.118	0.042	Steatite
O-64	0.172	0.118	0.047	Steatite
O-33	0.226	0.128	0.059	Cordierite
O-20	0.281	0.250	0.085	Steatite
O-3	0.281	0.210	0.085	Steatite
O-52	0.312	0.187	0.080	Cordierite
O-56	0.312	0.187	0.105	Steatite
O-17	0.312	0.187	0.090	Steatite
O-14	0.375	0.217	0.093	Cordierite
O-13	0.375	0.217	0.109	Cordierite
O-42	0.375	0.250	0.109	Cordierite
O-47	0.375	0.250	0.093	Steatite
O-28	0.406	0.218	0.109	Cordierite
O-12	0.437	0.250	0.156	Cordierite
Part No.	OD	OD 2	2 Hole	Material
O-24	0.468	0.281	0.156	Cordierite
O-49	0.500	0.285	0.187	Cordierite
O-48	0.500	0.312	0.185	Steatite
O-40	0.500	0.284	0.157	Steatite
O-25	0.500	0.284	0.157	Cordierite
O-32	0.500	0.284	0.156	Cordierite
O-34	0.500	0.281	0.187	Cordierite
O-8	0.500	0.281	0.163	Cordierite
O-53	0.500	0.250	0.156	Cordierite
O-63	0.562	0.312	0.191	Cordierite
O-6	0.562	0.312	0.187	Cordierite
O-50	0.575	0.313	0.193	Steatite
O-4	0.625	0.312	0.203	Cordierite
O-2	0.645	0.375	0.220	Cordierite
O-1	0.710	0.410	0.250	Cordierite
O-60	0.710	0.410	0.171	Cordierite

This information is for design guidance only. Du-Co Ceramics Company will not guarantee this information as absolute values. Various geometries can affect properties.

Standard lengths are 1″, 2″ & 3″ long, however the length can be made to best fit your application. Please call for additional information.

Need a Ceramic Thermocouple Tube for Your Application?

Du-Co Ceramics manufactures precision oval thermocouple tubes in steatite and cordierite materials for temperature sensing and high-temperature applications. Whether you need standard lengths or a custom configuration, our team can help identify the right solution for your application. Contact us today to discuss your requirements or request a quote.