A pipe threading machine is a power tool designed to cut precise, helical grooves (threads) onto the ends of pipes and conduits. These threads allow pipes to be screwed together with corresponding fittings (like elbows, couplings, and valves) to create strong, pressure-tight, and leak-resistant joints. They are a fundamental tool in plumbing, fire sprinkler installation, oil and gas, and electrical conduit work.

Machine Set –Up

OPERATIONS

1. Installing/Changing Dies

To install the Dies' Step Unlock the threading dies head and pivot it open. Loosen the lock handle and slide it all the way down in the adjustment slot, as illustrated in Figure 4. This will enable the dies to be inserted into/out of the threading dies head. Figure 4.

The lock handle is positioned in such a way as to facilitate the insertion of dies into the threading die head.

Insert the die numbered #1 , which features the number stamped on its side, into the corresponding slot numbered #1 on the threading die head, positioning the tapered end of the die towards the headstock, as illustrated in Figure 5. The die should securely engage with an audible "click" when inserted approximately three-quarters of the way into the slot.

Repeat the process outlined in Step 3 for the remaining three dies, ensuring that each die is matched with its corresponding numbered slot.

2.   Set scales and marks for appropriate pipe sizes

Utilize the lock handle to align the marker on the threading die's head with your desired pipe size, as indicated on the scale in Figure 6. Secure the handle once the correct setting is achieved.

3.   Locking/ Unlocking Pipe in headstock

3.1 To lock a piece of pipe in the headstock

Open both chucks on the headstock by rotating them, and insert the pipe through the support chuck.

Center the pipe in the support chuck and close it.

Close the hammer chuck until it grips the pipe evenly with all jaws, then open it about a 1/4-1/2 turn, and slam it closed, as shown in Figure 8, to lock the chuck on the pipe.

Note: When threading a short pipe that does not reach the support chuck, hold and center The pipe by hand until the hammer chuck is tightened.

3.2 To unlock a piece of pipe:

Slam the hammer chuck toward the rear of the machine to open the chuck.

Hold the pipe in one hand and open the support chuck with the other.Remove the pipe

4.Cutting/Squaring Pipe

The cutting attachment provides a quick and easy way of cutting pipe to length or squaring off the end of a pipe before cutting threads.

4.1 To cut/square a piece of pipe

Move the cutter, threading tool, and reaming tool out of the way of the work area.

Insert the piping into the headstock, draw it beneath the cutter, and secure it in place within the headstock.

Lower the cutter onto the piping, adjust its position using the carriage handle, and apply a gentle tightening force to the blade against the piping.

Turn the pipe threader ON.Slowly increase cutting pressure with the cutting handle until the cut is complete and the end of Pipe falls off. Figure 8 shows an example of a cutting operation. 

WARNING!

Due to the application of cutting pressure, there is a possibility that pipe ends may be ejected into the air upon severance. It is imperative to wear safety glasses and refrain from standing on the right side of the machine during the cutting process. 

4.2 To cut pipe threads

Install the proper dies to match your pipe size.Set the taper settings, as shown in Figure 9, to match your pipe size.

Raise the cutter and reaming tool out of the way.Lower the threading dies head into position and lock it in place.Turn the pipe threader ON .Turn the carriage handle clockwise to advance the threading dies head toward the pipe, as shown in Figure 10, and make sure that cutting fluid is flowing freely out of the threading dies head.

NOTE: If cutting fluid is not flowing freely, DO NOT continue with thread cutting operations. Stop and troubleshoot the machine.

Apply enough pressure on the carriage hand wheel for the dies to engage the pipe for about three or four threads, then release the carriage handle. A standard taper thread will continued to cut until finished.

When the threading tool roller drops down over the end of the taper block, the dies will open and the threading is complete.

NOTE: When you first use, the processed thread specifications need to use the corresponding thread gauge for thread detection, it may not be a success, at this time need to return to operation 2 to fine-tune the parameters, and continue with the next steps , this process may need to adjust several times, until the machine produces accurate thread specifications parameters, through the thread gauge detection.

Turn the pipe threader OFF and retract the carriage until the threading dies head clears the threaded pipe.Pull the lock pin out and raise the threading tool.

Ream the end of the pipe, as described on this page.

5.Reaming

Rough pipe ends must be reamed after they are cut or threaded to avoid sharp ends that cause lacerations when handling. Reaming is usually performed when the pipe is still locked in the headstock after cutting or threading.

5.1 To ream the pipe end

Make sure the pipe is locked in the headstock. Turn the pipe threader ON.

Move the reaming tool down and lock it into position. Turn the carriage handwheel to slowly move the reaming tool into the pipe and cut off the sharp edge.

When the reaming is finished, Turn the pipe threader OFF Using the carriage handwheel, move the reaming tool back and then lift it out of the way. Make sure the pipe has come to a complete stop, then remove it from the headstock.Figure 11 shows an example of a reaming operation.

WARNING!

Always disconnect power to the machine before performing maintenance. Failure to do this may result in serious personal injury.

a. Turn the master switch to the position of "off" or unplug the power when the machine is checked or maintained.

b. The shell of this machine is cast with a whole piece of aluminum alloy.

Its reduction gearbox keeps lubricating permanently. Do not impact the shell violently.

c. Cooling oil system: Clean the oil filter disk and oil suction

filter disk after running for 8-12 hours. Clean the oil tank and refill if the oil is dirty or turns black.

d. Small iron filings may fell into the oil tank when threading.It is therefore essential to clean the filter disk once a week to keep the machine in order.

e. Check the cutting blade each week. Replace it when it is blunt.

f. Check the attention of the claw points in the claw one a month. If the claw points are worn, replace them(three each set) to ensure to produce the threads of high quality.

g. Clean screwing dies and die heads every shift. Check if the teeth of the screwing die are broken. If they are,remove the cuttings between the teeth. If the die is already broken, replace a set of dies instead of the broken one only.

h. There are two oil cups on the shell of main shaft. Oil at least twice each shift to lubricate the fore and rear bearings.

i. Unplug the power when the machine is not in use. Coat corrosion resistant oil on both fore and rear guideposts and other working surfaces. Store it in a dry and airing place.

We have many type pipe threading machine for your choose. You can click below photo for detailed link

                    STT50                                                                                                                       STT50A

                  STT50R                                                                                            STT80

                    STT100                                                                                     STT150

Key Components of a Typical Machine

While designs vary, most industrial pipe threaders have these main parts:

1. Head/Spindle: The rotating component that holds the dies. It's powered by an electric motor.

2. Die Head/Chuck: Holds the cutting dies. Many use a self-centering, automatic opening die head that closes around the pipe as you start and opens automatically when the thread is complete.

3. Cutting Dies: Hardened steel discs with cutting teeth, specific to the pipe size and thread standard (e.g., NPT in the US).

4. Vise/Jaws: A sturdy clamping mechanism to hold the pipe securely in place, preventing it from rotating.

5. Carriage & Toggle Arm: The assembly that moves the die head onto the pipe. The operator pulls a lever (toggle arm) to engage the cut.

6. Oil Pump System: Delivers a steady stream of cutting oil to the dies and pipe. This is crucial for cooling, lubrication, chip flushing, and creating a smooth finish.

7. Motor & Gearbox: Provides the necessary torque for cutting threads, especially in larger, heavy-wall steel pipes.

How It Works (The Basic Process)

1. Measure & Cut: The pipe is cut to length with a separate cutter (often built into the same machine stand).

2. Chamfer: The outer edge of the pipe end is beveled to help start the dies smoothly.

3. Secure: The pipe is placed in the machine's vise and clamped tightly.

4. Lubricate & Set: The correct die size is selected and installed in the die head. The oil pump is turned on.

5. Threading: The operator pulls the toggle arm, engaging the spinning dies onto the rotating pipe. The dies cut the threads as they advance along the pipe's length.

6. Disengage & Inspect: Once the proper thread length is achieved (usually visually by the operator), the die head automatically opens, and the carriage is retracted. The threaded pipe is unclamped and inspected.

Why Are They Used? (Advantages)

• Strength & Reliability: Threaded joints are robust and can handle high pressure and mechanical stress.

• Field Fabrication: Allows pipes to be precisely measured, cut, and threaded on-site for custom installations and repairs.

• Disassembly & Maintenance: Unlike welded joints, threaded joints can be taken apart for system modifications or repairs.

• Versatility: One machine can handle a wide range of pipe sizes and materials (steel, stainless steel, iron, some plastics).

Applications & Industries

• Plumbing: For water supply and drain lines in commercial and industrial buildings.

• Fire Protection/Sprinkler Systems: Mandatory for the steel pipe networks in these systems.

• Oil & Gas: For process lines, wellheads, and instrumentation.

• HVAC: For fuel gas lines, refrigerant lines, and some water lines.

• Electrical: For threading rigid steel (RSC) and intermediate metal (IMC) conduit.

If needs to know more about our pipe threading machine, please contact whatsapp/wechat 008618868759246 Lisa Chen, thanks.