What is the thread type on a LFNC-A liquidtight fitting sleeve designed to prevent loosening?

The thread type on a LFNC-A liquidtight fitting sleeve designed to prevent loosening is indeed left-handed. Left-handed threads are utilized in situations where rotation or vibration could cause standard right-handed threads to loosen over time. This is particularly relevant for liquidtight fittings in applications where environmental factors or mechanical stresses may apply, ensuring a more secure connection.

In contrast, right-handed threads are the conventional choice for most fasteners, making left-handed threads a specific solution for particular challenges, such as preventing loosening due to counter-clockwise motion or vibrations. The option that indicated both left and right-handed threads does not apply here, as LFNC-A fittings specifically employ left-handed threads for this purpose.