To connect different sizes of drill rods, casing, etc.,which have different thread characteristics it is necessary to use special pieces of equipment which are classified under the general heading of “Subs”. The term “subs” is an abbreviation for “substitutes” and are often referred to by other names such as adapters, casing heads, etc.

Polmak’ s standard line of manufacturing program includes all the commonly used subs and your requirements can be supplied from our stock. Any other type of subs can be manufactured as per your requirements.

To properly identify a sub , the size and type of each thread should be indicated. EX: Sub; AW Drill Rod box to NW flush Joint Casing Pin.