This collar can be used in both upset and non-upset casing to provide maximum clearance during rotation. Locking is by way of a groove in the middle into which a spiral nail is driven for improved grip on the casing.
It features specially designed collar hinges which wrap to the inside and hinge pins which do not work loose. This device can be latched on to the casing pipe without having to be slipped on at the end of the casing pipe, thus allowing easy installation.
This device is also available in a premium design where a broader band is used to form the collar (Type G42). Available in the size range 2-7/8” to 30”.
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