Description
The NGK CMR5H (Stock #7599) is a compact, resistor-type nickel spark plug designed for small displacement engines and professional-grade outdoor power equipment. With a 10 mm thread, 0.7 mm gap, and 10k ohm resistor, it delivers reliable ignition, reduced electrical interference, and consistent performance in handheld and utility engines.
Key Features
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Standard nickel spark plug for dependable operation
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10k ohm resistor reduces radio frequency interference (RFI)
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Copper core enhances heat dissipation and conductivity
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Solid terminal for secure connection in fixed terminal applications
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Trivalent metal plating resists corrosion and seizure
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Corrugated ribs prevent flashover
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Triple sealing system helps prevent combustion leakage
- Ideal for lawn, garden, and industrial equipment
Specifications
General
- Part Number: CMR5H
- Stock Number: 7599
- Brand: NGK
- Plug Type: Nickel
- Heat Range: 5
- Resistor: Yes
- Resistor Value: 10k Ohm
- Gap: 0.028" (0.7 mm)
- Longevity: ~30,000 miles equivalent service life
- Warranty: 60 Days
Shell
- Thread Diameter: 10 mm
- Thread Pitch: 1.0 mm
- Seat Type: Gasket
- Reach: 12.7 mm (1/2")
- Hex Size: 5/8" (16 mm)
- Terminal Type: Solid (non-removable)
- Overall Height: Bantam (compact design)
Center Electrode
- Material: Nickel
- Type: Standard
- Size: 2.5 mm
- Projection: Non-Projected
Ground Electrode
- Material: Nickel
- Type: Standard
- Quantity: 1
Torque Specs
- Cast Iron: 7.2–10.8 lb-ft
- Aluminum: 7.2–8.7 lb-ft
Fitment Overview
Not intended for automotive or traditional powersports vehicles
Primary Applications:
Commercial & Industrial / Power Equipment
- Honda GX25, GX25N, GX25NT, GX25T
- Honda GX35, GX35NT
Lawn & Garden Equipment
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Honda
- FG110 tiller
- WX10 / WX10K water pumps
- HHT25 / HHT35 series trimmers & brush cutters
- UMC425 / UMC435 multi-tool systems
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Shindaiwa
- Trimmers: C254, C344
- Blowers: EB254, EB344, EB854
- Edgers: LE254
- Multi-tool: M254
- Water pumps & power broom units
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Stihl
- FS100RX, FS110R, FS130R trimmers
- FC90, FC95, FC100, FC110 edgers
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Other
- Champion Power Equipment 100166 pump
- Skeet-Daddle fogger (Honda GX35-based)
Performance Notes
- Designed for high-revving, small 4-stroke engines
- The compact (bantam) design fits tight engine spaces
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Heat range 5 is moderate—ideal for general-purpose small engine operation
- Always verify OEM gap and torque specs before installation
Summary
The NGK CMR5H (7599) is a resistor-type nickel spark plug with a 10 mm thread, 0.7 mm gap, and compact design, built for small engines and professional outdoor equipment. It provides reliable ignition, reduced interference, and durability in demanding utility applications.
