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 predrilled 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
CHT ——————————– 1.5 oz