Technician A says ISO flare fittings may have a different pitch thread depending on the make and model of the vehicle. Technician B says ISO flares tend to seal better while using more torque on the threaded nut. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because ISO flare fittings can indeed have different pitch threads depending on the vehicle's make and model. Technician B is incorrect because ISO flares are designed to seal with less torque, not more, due to their design which includes a 45-degree flare that mates with a corresponding surface to create the seal.

Technician a Says ISO Flare Fittings May Have a Different