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HTS 8547Insulating fittings for electrical machines, appliances or equipment, being fittings wholly of insulating material apart from any minor components of metal (for example, threaded sockets) incorporated during molding solely for the purposes of assembly, other than insulators of heading 8546; electrical conduit tubing and joints therefor, of base metal lined with insulating material

Product or HTS code

Rate lines7

Code	Description	General	Special	Column 2	Units	Calculate
8547.10	8547.10Insulating fittings of ceramics
8547.10.40.00	8547.10.40.00Ceramic insulators to be used in the production of spark plugs for natural gas-fueled, stationary, internal combustion enginesGeneral 3% · Special Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 60% · No.	3%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	60%	No.
8547.10.80.00	8547.10.80.00OtherGeneral 3% · Special Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 60% · No.	3%	Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	60%	No.
8547.20.00.00	8547.20.00.00Insulating fittings of plasticsGeneral Free · Column 2 30% · No.	Free		30%	No.
8547.90.00	8547.90.00OtherGeneral 4.6% · Special Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 45%	4.6%	Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	45%
8547.90.00.10	8547.90.00.10Other insulating fittingsGeneral 4.6% · Special Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 45% · No.	4.6%	Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	45%	No.
	Electrical conduit tubing and joints therefor, of base metal lined with insulating materialGeneral 4.6% · Special Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 45%	4.6%	Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	45%
8547.90.00.20	8547.90.00.20Conduit tubingGeneral 4.6% · Special Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 45% · kg	4.6%	Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	45%	kg
	JointsGeneral 4.6% · Special Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 45%	4.6%	Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	45%
8547.90.00.30	8547.90.00.30ThreadedGeneral 4.6% · Special Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 45% · kg	4.6%	Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	45%	kg
8547.90.00.40	8547.90.00.40OtherGeneral 4.6% · Special Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 45% · kg	4.6%	Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	45%	kg

2026 HTS Revision 21 (October 9, 2026)

Duty by country of origin

Rate line	China24.92% of imports	Mexico14.68% of imports	Japan10.59% of imports	Canada10.4% of imports	Germany7.52% of imports	India5.45% of imports	Switzerland3.98% of imports	South Korea3.45% of imports	Taiwan3.31% of imports	Thailand2.24% of imports
8547.10.40.00Ceramic insulators to be used in the production of spark plugs for natural gas-fueled, stationary, internal combustion engines	40.5%9903.05.319903.88.03	13%9903.05.55	12.5%9903.05.49	13%9903.05.29	10%9903.05.39	13%9903.05.44	12.5%9903.05.74	12.5%9903.05.71	10%9903.05.76	15.5%9903.05.77
8547.10.80.00Other	40.5%9903.05.319903.88.03	13%9903.05.55	12.5%9903.05.49	13%9903.05.29	10%9903.05.39	13%9903.05.44	12.5%9903.05.74	12.5%9903.05.71	10%9903.05.76	15.5%9903.05.77
8547.20.00.00Insulating fittings of plastics	37.5%9903.05.319903.88.03	10%9903.05.55	12.5%9903.05.49	10%9903.05.29	10%9903.05.39	10%9903.05.44	12.5%9903.05.74	12.5%9903.05.71	10%9903.05.76	12.5%9903.05.77
8547.90.00.10Other insulating fittings	From 29.6%9903.88.03Depends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	VariesDepends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts
8547.90.00.20Conduit tubing	From 29.6%9903.88.03Depends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	VariesDepends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts
8547.90.00.30Threaded	From 29.6%9903.88.03Depends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	VariesDepends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts
8547.90.00.40Other	From 29.6%9903.88.03Depends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts	VariesDepends on product facts	VariesDepends on product facts	VariesDepends on product facts	From 4.6%Depends on product facts

Total duty on a $10,000 ocean shipment entered 2026-10-13, before customs fees. Origins are the leading sources of US imports under this heading in 2025 (US Census Bureau).