Subs - Gulf Engineering Services Ltd | Trinidad & Tobago
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There are several types of subs used within the industry which may vary by manufacturer, the most common being:

Bit Sub

The bit sub connects BHA components to the bit and is often bored for a float sub.

Crossover Sub

A short sub assembly is used to enable the connection of two components with differing thread types or sizes.

Float Sub

A float sub has a body which contains a one-way check valve to prevent drilling mud and cuttings flowing back up the drill string.

Lift Sub

The lift sub is a solid device useful for picking up slick components at the surface.