Ceramic Band Heater Insulators & Ceramic Knuckles

Du-Co Ceramics manufactures high-quality ceramic band heater insulators, also known as ceramic knuckles, for use in industrial band heaters and high-temperature heating applications. These ceramic insulators are encapsulated within a steel shroud and allow coiled resistance wires to operate safely at elevated temperatures while providing excellent electrical insulation and long service life. Ceramic band heater insulators are commonly used in plastic extrusion and injection molding equipment where dependable, uniform heating is critical.

Ceramic Band Heater Insulators

Click on dimension header to list by size

Part No.	Material	No. of Holes	Hole Diameter	OD Length	OD Width	Thickness	Grooved	No Groove
A-2845	L-3 Steatite	8	0.250	3.375	0.625	0.468		X
A-2929	L-3 Steatite	6	0.250	2.375	0.625	0.468		X
A-2930	L-3 Steatite	4	0.250	1.875	0.469	0.625		X
A-2931	L-3 Steatite	6	0.250	2.875	0.469	0.625		X
A-2932	L-3 Steatite	4	0.203	1.375	0.469	0.625		X
A-2961	Cordierite	4	0.220	1.875	0.453	0.625		X
A-2962	Cordierite	6	0.220	2.375	0.453	0.625		X
A-2963	Cordierite	6	0.220	2.875	0.543	0.625		X
A-2964	Cordierite	8	80.242	3.375	0.453	0.625		X
A-3455	L-3 Steatite	2	0.250	0.875	0.469	0.625		X
A-3474	Cordierite	3	0.185	0.875	0.375	0.625		X
A-3517	L-3 Steatite	4	0.250	1.875	0.469	0.406		X
A-3518	L3-Steatite	6	0.240	2.875	0.469	0.625		X
A-3519	L3-Steatite	6	0.250	2.375	0.469	0.406		X
A-3520	L3-Steatite	8	0.250	3.375	0.469	0.406		X
A-3521	L3-Steatite	2	0.250	0.875	0.469	0.406		X
A-3522	L3-Steatite	4	0.203	1.375	0.469	0.406		X
A-3684	L-3 Steatite	9	0.250	3.875	0.468	0.625		X
A-3685	L-3 Steatite	6	0.140	1.360	0.312	0.305		X
Part No.	Material	No. of Holes	Hole Diameter	OD Length	OD Width	Thickness	Grooved	No Groove
A-3685-1	L-3 Steatite	6	0.140	1.360	0.312	0.400		X
A-3686	L-3 Steatite	4	0.140	0.937	0.312	0.312		X
A-3686-1	L-3 Steatite	4	0.140	0.937	0.312	0.400		X
A-3787	L-3 Steatite	4	0.242	1.875	0.453	0.625		X
A-3788	L-3 Steatite	4	0.242	1.875	0.453	0.625	X
A-3790	L-3 Steatite	8	0.242	3.375	0.453	0.625		X
A-3791	L-3 Steatite	8	0.242	3.375	0.453	0.625	X
A-3793	L-3 Steatite	6	0.242	2.875	0.453	0.625		X
A-3794	L-3 Steatite	6	0.242	2.875	0.453	0.625	X
A-3796	L-3 Steatite	6	0.242	2.375	0.453	0.625		X
A-3797	L-3 Steatite	6	0.242	2.375	0.453	0.625		X
A-3801	L-3 Steatite	4	0.205	1.375	0.375	0.625		X
A-3802	Cordierite	3	0.205	0.875	0.375	0.625		X
A-3957	L-3 Steatite	4	0.205	1.375	0.375	0.625	X
A-4073	Cordierite	4	-.242	1.875	0.453	0.625		X
A-4074	Cordierite	6	0.242	2.375	0.453	0.625		X
A-4075	Cordierite	6	0.242	2.875	0.453	).625	X
A-4076	Cordierite	4	0.205	1.375	0.375	0.675		X
A-4202	L-3 Steatite	4	0.210	1.365	0.453	0.675		X
Part No.	Material	No. of Holes	Hole Diameter	OD Length	OD Width	Thickness	Grooved	No Groove
A-4203	L-3 Steatire	4	0.210	1.375	0.453	0.625	X
A-4301	L-3 Steatite	6	0.250	2.375	0.469	0.625		X
A-4400	L-3 Steatite	4	0.250	1.875	0.469	0.625	X
A-4401	L-3 Steatite	6	0.250	2.375	0.469	0.625	X
A-4402	L-3 Steatite	6	0.350	2.875	0.469	0.625	X
A-4403	L-3 Steatite	8	0.250	3.375	0.469	0.625	X
A-4437	L-3 Steatite	4	0.203	1.330	0.469	0.625		X
A-4463	L-3 Steatite	3	0.250	0.875	0.469	0.625		X
A-4652	L-3 Steatite	2	0.266	0.940	0.453	0.625	X
A-4653	L-3 Steatite	3	0.266	1.420	0.453	0.625	X
A-4654	L-3 Steatite	4	0.266	1.900	0.453	0.625	X
A-4655	Cordierite	6	0.242	2.875	0.453	0.625	X
A-4656	Cordierite	6	0.242	2.375	0.453	0.625	X
A-4657	Cordierite	8	0.242	3.375	0.453	0.625	X
A-4658	Cordierite	4	0.242	1.875	0.453	0.625	X
A-4685	Corierite	4	0.205	1.375	0.375	0.625	X
A-4728	L-3 Steatite	8	0.140	1.861	0.312	0.400		X
A-4816	L-3 Steatite	6	0.242	2.375	0.453	0.406		X
A-4817	L-3 Steatite	8	0.242	3.375	0.453	0.406		X
A-4846	L-3 Steatite	6	0.232	1.882	0.400	0.500		X
Part No.	Material	No. of Holes	Hole Diameter	OD Length	OD Width	Thickness	Grooved	No Groove
A-5010	L-3 Steatite	1	0.266	0.460	0.450	0.625	X
A-5231	96% MgO	6	0.250	2.580	0.453	0.625	X
A-5337	L-5 Steatite	6	0.242	2.375	0.455	0.625	X
A-5600	L-5 Steatite	6	0.242	2.375	0.45	0.625		X
A-5609	L-5 Steatite	4	0.242	1.583	0.45	0.625		X
A-5650	L-5 Steatite	2	0.242	0.792	0.45	0.625		X
A-5806	L-5 Steatite	3	0.242	1.188	0.45	0.625		X
A-6062	L-5 Steatite	1	0.242	0.396	0.45	0.625		X
A-6063	L-5 Steatite	8	0.242	3.170	0.45	0.625		X

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

Need Ceramic Band Heater Insulators for Your Heating Application?

Du-Co Ceramics manufactures high-quality ceramic band heater insulators and ceramic knuckles for industrial heating systems and OEM applications. Contact our team to discuss your requirements, review available configurations, or request a quote for your next project.