JP Instruments
JPI M113-38

CHT Probe with Spark Plug Gasket 3/8 inch, from JP Instruments, jpi-m113-38

CHT Probe with Ring Gasket 3/8"

Item Qualifies for Free Ground Freight (48 States) on Orders Over $350

JP Instruments Thermocouple Type K CHT Bayonet Probe with Ring Gasket 3/8"

  • CHT probe
  • ring gasket 3/8"
  • O-200 and O-300 engines do not have holes for CHT probes. Use M-113 gasket probes.
Adapter probe permits the JPI probe and the factory CHT to coexist in the same location. The Cylinder Head Temperature (CHT) – standard Bayonet – probe, has a captive 3/8-24 boss which is screwed into the base of the cylinder. The CHT port is drilled by your engine manufacturer. The CHT probe has a screwdriver slot to facilitate tightening. The bayonet probe 5050T has the 3/8-24 boss as part of the probe and is screwed into the base of the cylinder
NPT - National Pipe Thread Taper
Note! Pipe thread sizes do not refer to any physical dimensions. The outside diameter of a pipe or fitting must be measured and referenced to a table for size identification.
Note! Inserting a NPT tapered fitting into a port tapped for a straight thread fitting and tightening it can break or severely damage the item the fitting is being installed in.
Pipe Size
Thread Pitch
Fitting O.D.
NPT Specifications
  • Tapered thread 1° 47'
  • Flat truncation of thread roots and crests
  • Thread angle 60°
  • Thread Pitch measured in threads per inch