Description
The NGK D8HA (Stock #7112) is a standard nickel spark plug built for dependable OE-style performance. As part of NGK’s proven yellow-box line, it features a copper core for strong heat dissipation, a nickel center electrode, and triple gasket sealing to help prevent combustion gas leakage. It is a non-resistor plug designed for older compatible motorcycle applications.
Key Features
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OE-style nickel spark plug for reliable everyday performance
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Copper core improves heat transfer and conductivity
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Trivalent metal plating helps resist corrosion and seizure
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Cold-rolled threads help reduce risk of cross-threading
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High-grade alumina silicate ceramic insulator for strength and dielectric performance
- Non-resistor design
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Stud terminal connection
Specifications
General
- Part Number: D8HA
- Stock Number: 7112
- Brand: NGK
- Plug Type: Standard Nickel
- Heat Range: 8
- Resistor: No
- Resistance: 0.0 Ohms
- Gap: 0.7 mm
- Warranty: 60 Days
Shell
- Thread Size: M12 x 1.25
- Thread Diameter: 12 mm
- Thread Pitch: 1.25 mm
- Seat Type: Flat
- Washer Type: Crush
- Reach: 12.7 mm
- Hex Size: 18 mm
- Electrical Terminal Type: Stud
Center Electrode
- Core Material: Copper
- Tip Material: Nickel
- Design: Standard
- Projection: Mid Projection
- Insulator Tip Projection: 0.08 in / 2.15 mm
Ground Electrode
- Core Material: Nickel
- Tip Material: Nickel
- Tip Design: Standard
- Configuration: J-Gap
- Quantity: 1
Other
- Insulator Height: 49.8 mm
- Insulator Material: Ceramic
- Skirt: No
- Skirt Length: 0.0 in
- Metallurgy: Copper
Torque Specs
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Cast Iron: 7.2–10.8 lb-ft
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Aluminum: 7.2–8.7 lb-ft
Vehicle Fitment
Compatible applications listed include:
Honda
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CA175 — 1968
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CA200 — 1964
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CB175 Super Sport — 1969, 1970, 1971, 1972, 1973
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CL175 Scrambler — 1968, 1969, 1970, 1971, 1972
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CL72 Scrambler 250 — 1962
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CL77 Scrambler 305 — 1966
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CT90 — 1969–1979
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SL175 — 1970, 1971
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SL90 — 1969
Performance Notes
- Best suited for older applications designed for a standard nickel, non-resistor spark plug
- Should be used only where the engine calls for:
- M12 x 1.25 thread
- 12.7 mm reach
- Flat seat
- 0.7 mm gap
- Because this is a specialty older fitment plug, exact application should always be verified before purchase
