Threaded rod, also known as threaded bar, threaded studding or screw rod, is a common fastener type. It is used much the same way as a very long, thick bolt or screw. Screwed rod threading might run the full length of the stud (all-thread), or partway along from both ends.
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Threaded rods and stud bolts are widely used wherever a fastener of greater length and rigidity is needed to secure two items together. They are often found securing wood or metal items together or being used to give additional strength to structures supported by concrete and other materials. The threading makes it easy to attach nuts and other fixings to the rod as required.
You will find a wide variety of sizes, gauges and load capacities available to suit all kinds of jobs. Some varieties may have a drive slot in one end, making them easier to install, although most studding does not feature a head in the same way that most bolts and screws do.
Standard coupling sleeve, also known as semi bridge coupling sleeve, has a section of the bridge without a thread in the middle. The threaded part of the drill pipe cannot be screwed through the bridge part of the coupling, and the end of the thread can closely adhere to the casing bridge zone. Standard coupling sleeve is particularly suitable for high-torque drilling rigs. Most rope thread (R thread) and trapezoidal thread (T thread) coupling sleeves are with half-bridge type. The half-bridge type is by far the most widely used couplings.
Full bridge coupling sleeve can completely eliminate the looseness of the coupling sleeves along with the threaded connection. It is mainly used in surface mining, with better disassembly characteristics, firmer connections, and almost no clamping situation.
Crossover couplings are used to convert different thread types or thread diameter sizes.
Thread
Length
Diameter
Weight
[kg]
Model No.
Part No.
[mm]
[in]
[mm]
[in]
R32
160
6 1/4"
45
1 3/4"
1.0
LR32-D45-160
705--160
R38
180
7 1/8"
56
2 13/64"
2.0
LR38-D56-180
707--180
T38
190
7 1/2"
56
2 13/64"
1.9
LT38-D56-190
722--190
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T45
210
8 1/8"
63
2 31/64"
2.7
LT45-D63-210
723--210
T51
235
9 1/4"
71
2 51/64"
3.8
LT51-D71-235
724--235
R38-R32
190
7 1/2"
56
2 13/64"
2.2
LR38/R32-D56-190
707--190
T38-R32
190
7 1/2"
56
2 13/64"
2.2
LT38/R32-D56-190
722--190
T38-R38
190
7 1/2"
56
2 13/64"
2.5
LT38/R38-56-190
722--190
T51-T45
225
8 7/8"
71
2 51/64"
4.5
LT51/T45-D71-225
724--225
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