Stop Collar is used to hold centralizer or cement baskets on any position of casing, which ensures the positions of centralizer or cement basket to meet the design. The stop collars are available in two types: higned type and slip on type. The stop collars can be installed on any position on casing to limit the axial movement of centralizer and cement baskets.
 
Usage
1.  Fastening screw stop ring when use, first set into the casing, and then using a wrench to tighten the screws.
2. Fixed screw type when use, first set into the casing, and then insert screws, type in with a hammer.
3. Snap fit stop ring, direct stop ring button on the casing, use pin lock, then knocked into the screws.
 
Hinged Bolted Stop Collars
An economical collar suitable for sub-critical annular tolerances. Available in size range 4 1/2" to 20", it has a cross bolt design which makes it an efficient and user friendly device.
 
Hinged Spiral Nail Stop Collars
Available in the size range 4 1/2" to 20", this device can be set in both upset and non-upset casing to provide maximum clearance during rotation. It has a groove in the middle into which a spiral nail can be driven for improved grip on the casing. The broader band firmly grips the collar into position around the casing.
 
Hinged Stop Collar with Set Screw
Available in the size range 4 1/2" to 20", this device has a high cost-utility ratio. This hinged collar with a row of set screws positions easily and firmly around the casing.
 
Slip on Stop Collars with Set Screws
This slip-on set screw device is recommended for small hole operations.
Available in size range 2-7/8" to 20" and is gripped by a row of screws, this is a heavy duty device. 
Hinged Set Screw Stop Collar
 
Features
1.Making up of two pieces
2.Hinged at the two ends
3.Making it 180 degress apart
4.Sizes ranging from 4-1/2" to 20"
5.Gripping fore by one of the row of set screw
 
Advantages
1. They are made up of two pieces and hinged at the two ends making it 180 degree apart. 
2. The gripping force is applied by one of the row of SetScrew which tightens the collar to the casing firmly. 
3. They can be fastened on to the casing pipe and much easy to install.
4. They are most effective in conditions where there is low annual clearance. 
5. A special iron phosphate coating is applied on these collars to prevent it from getting rust.