Top > Race Information > Racing Spark Plugs > Series of NGK racing spark plugs

Thread size (Hexagon size)	Spark plug type	Spark plug number	Heat rating	Terminal nut type	Firing end	Center	Ground
φ14x19mm ( 20.8Hex)	BP-E	R4304A-	7,8,9,10	removable		Gold Palladium	Nickel Alloy
	B-E	R6918B-	7,8,9	solid terminal		Platinum	Nickel Alloy
		R6918C-	9	solid terminal		Platinum	Nickel Alloy
		R6021E-	8,9,10	removable		Nickel Alloy	Nickel Alloy
		R7376-	7,8,9,10	solid terminal		Iridium	Platinum
		R6712-	9,10	removable		Nickel Alloy	---
φ14x22mm (20.8Hex)	Short	R6179C-PA	105	solid terminal		Platinum	Platinum
		R7376B-	9,10	solid terminal		Iridium	Platinum
φ14x22mm (16.0Hex)	Short	R7282A- *2	10,105,11	solid terminal		Iridium	Platinum
φ14x19mm (16.0Hex)	Short	R7282-  *2	9,10,105,11	solid terminal		Iridium	Platinum
	Short	R7282M- *2	11,115	solid terminal		Iridium	Platinum
	BK-E(IS0) *1	R6888A-	8,9,10	solid terminal		Nickel Alloy	Nickel Alloy
		R7433-	8,9,10	solid terminal		Iridium	Nickel Alloy
	BC-E(IS0) *1	R7434-	8,9,10	solid terminal		Iridium	Platinum
		R7279-	10	solid terminal		Iridium	Platinum
		R6601-	8,9,10,11	solid terminal		Nickel Alloy	---
	BCP-E(JIS)	R7435-	8,9,10	solid terminal		Iridium	Nickel Alloy
	BC-E(JIS)	R7436-	8,9,10	solid terminal		Iridium	Platinum
		R6690-	9,10,11	solid terminal		Nickel Alloy	---
φ14x26.5mm (16.0Hex)	LFR (long reach)	R7437-	8,9,10	solid terminal		Iridium	Nickel Alloy
		R7438-	8,9,10	solid terminal		Iridium	Platinum
φ14x12.7mm (20.8Hex)	B-H	R5525-	7,8,9,10,11	removable		Gold Palladium	Nickel Alloy
φ14x21.5mm (20.8Hex)	Rotary Engine RX-7	R6725-	9,10,105,11,115	solid terminal		Platinum	Platinum
		R7420-	9,10,105,11	solid terminal		Iridium	Platinum
φ14x21mm (20.8Hex)	Rotary Engine RX-8 L	R7440A-L	9,10	solid terminal		Iridium	Platinum
φ14x19mm (20.8Hex)	Rotary Engine RX-8 T	R7440B-T	10,11	solid terminal		Iridium	Platinum
φ12x26.5mm (16.0Hex)	LKR (long reach)	R2556B-	8,9,10	solid terminal		Iridium	Platinum
φ12x26.5mm (14.0Hex)	LKAR (long reach)	R2558A-	8,9,10	solid terminal		Iridium	Platinum
φ12x19mm (16.0Hex)	DC-E	R2349-	9,10,11	solid terminal		Nickel Alloy	---
		R2525-	9,10	removable		Platinum	Nickel Alloy
φ10x26.5mm (14.0Hex)	LMAR (long reach)	R0465B-	10	threaded		Nickel Alloy	---
		R0451B-	8	solid terminal		Iridium	Nickel Alloy
φ10x19mm (16.0Hex)	C-E	R0373A-	8,9,10	threaded		Iridium	Platinum
		R0045G-	10,11 GAP1.4	removable		Nickel Alloy	---
		R0045J-	9,10,11,12 GAP1.1	removable		Nickel Alloy	---
		R0045Q-	10,11 GAP1.1	threaded		Nickel Alloy	---
φ10x19mm Half thread (16.0Hex)	C-EH	R0409B-	8,9,10	threaded		Iridium	Nickel Alloy
		R0459A-	10	threaded		Nickel Alloy	---
φ10x12.7mm (16.0Hex)	C-H	R0161-	9,10,11	removable		Nickel Alloy	Nickel Alloy
φ8x19.0mm Half thread (13.0Hex)	E-EH	R847-	10,11	threaded		Nickel Alloy	---

1)	ISO:The length from gasket to terminal of ISO type spark plugs is 50.5mm which is 2.5mm shorter than BCP-E or BC-E type spark plugs.
2)	It's necessary to use special plug caps
3)	Resistor spark plugs are recommended for cars originally equipped with resistor spark plugs. When nonresistor spark plugs are installed in such cars, there is some possibility that the electric devices in the car, such as the audio system or the engine managemant system, would be affected by noise.