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All “D” series NGK spark plugs use a 12mm outer diameter thread with a 1.25mm thread pitch.
See below reference chart for specs:
D7EA: | 18mm Hex | 19.00mm Reach | 0.7mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: No |
D8EA: | 18mm Hex | 19.00mm Reach | 0.7mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: No |
D9EA: | 18mm Hex | 19.00mm Reach | 0.7mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: No |
D9EA: | 18mm Hex | 19.00mm Reach | 0.7mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: No |
DCPR7E: | 16mm Hex | 19.00mm Reach | 0.8mm Gap | 2.5mm Nickel Electrode | Removable Nut | Resistor: Yes |
DCPR8E: | 16mm Hex | 19.00mm Reach | 0.7mm Gap | 2.5mm Nickel Electrode | Removable Nut | Resistor: Yes |
DCPR8EIX: | 16mm Hex | 19.00mm Reach | 0.8mm Gap | 0.6mm Iridium Electrode | Removable Nut | Resistor: Yes |
DCPR8EKC: | 16mm Hex | 19.00mm Reach | Multi-Ground | 2.5mm Nickel Electrode | Solid Nut | Resistor: Yes |
DCPR9E: | 16mm Hex | 19.00mm Reach | 0.9mm Gap | 2.5mm Nickel Electrode | Solid Nut | Resistor: Yes |
DCPR9EIX: | 16mm Hex | 19.00mm Reach | 0.8mm Gap | 0.6mm Iridium Electrode | Removable Nut | Resistor: Yes |
DP8EA-9: | 18mm Hex | 19.00mm Reach | 0.9mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: No |
DPR6EA-9: | 18mm Hex | 19.00mm Reach | 0.9mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: Yes |
DPR7EA-9: | 18mm Hex | 19.00mm Reach | 0.9mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: Yes |
DPR8EA-9: | 18mm Hex | 19.00mm Reach | 0.9mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: Yes |
DPR8EVIX-9: | 18mm Hex | 19.00mm Reach | 0.9mm Gap | 0.6mm Iridium Electrode | Removable Nut | Resistor: Yes |
DPR9EA-9: | 18mm Hex | 19.00mm Reach | 0.9mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: Yes |
DR7EA: | 18mm Hex | 19.00mm Reach | 0.7mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: Yes |
DR8EA: | 18mm Hex | 19.00mm Reach | 0.7mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: Yes |
DR8EIX: | 18mm Hex | 19.00mm Reach | 0.8mm Gap | 0.6mm Iridium Electrode | Threaded Stud | Resistor: Yes |
DR8ESL: | 18mm Hex | 19.00mm Reach | 0.7mm Gap | 2.5mm Nickel Electrode | Threaded Stud | Resistor: Yes |
DR9EIX: | 18mm Hex | 19.00mm Reach | 0.8mm Gap | 0.6mm Iridium Electrode | Threaded Stud | Resistor: Yes |