Can't answer that question however the "Torch" brand of spark plugs are CHEAP Chinese plugs.
You'll find commercial saw's (TOP END machines) from Echo , Stihl, etc have the Bosch or NGK'S from the factory.
You'd be much better buying an NGK, Bosch or Champion equivalent:
https://www.sparkplug-crossreference.com/convert/torch/F6RTC .