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close this bookThreaded Joints - Course: Techniques of Fitting and Assembling Component Parts to Produce Simple Units. Instruction Examples for Practical Vocational Training
View the document(introduction...)
View the documentPreliminary Remarks
View the documentInstruction Example 33.1. Making a Threaded Joint
View the documentInstruction Example 33.2. Making a Threaded Joint with Locking Devices
View the documentInstruction Example 33.3. Making a Container with Lid
View the documentInstruction Example 33.4. Making a Pipe Joint

Instruction Example 33.4. Making a Pipe Joint

The purpose of this exercise is to make a long-thread joint of two pipes using a bell piece.


- 2 pcs. Pipe (1) and (2), 1-inch diameter, abt. 400 mm long
- 1 pc. Pipe nut (2), R 1-inch
- 1 pc. Ring gasket (3)
- 1 pc. Pipe bell with internal thread (4), R 1-inch



Die stock with cutting dies, R 1-inch, open ended wrench to fit the pipe size, half-round file

Measuring and testing means

Steel rule

Auxiliary accessories

Cutting fluid, hemp, vice, acid-free grease

Necessary previous knowledge

Manual material working: Measuring, testing, marking, thread cutting

Sequence of operations


1. Prepare your workplace, make all component parts, tools, etc. available.

Check for completeness.

2. Check the original dimensions of the pipe pieces.

Check angles, edges inside and outside for burrs.

3. Prepare the die stock, mount R 1-inch cutters.

Mount the cutters in the right 1 to 4 sequence.

4. Mount the fast piece of pipe (2), rough-cut and re-thread the long thread.

Apply cutting fluid to the pipe end.
After rough-cutting, set fine adjustment for re-threading.

5. Mount second pipe piece (2) and cut short thread (abt. 19 mm).

Rough-cut and re-thread.

6. Clean the thread and check.

Allow no defects in the thread.

7. Screw pipe nut (2) and the ring gasket (3) onto long thread. Continue screwing the bell (4) until it stops.

Stage (I): Bell to be flush with the pipe.

8. Hold the short thread against the long thread and screw back the bell.

Stage (II): Apply a hemp packing if required, to make the joint tight.

9. Tighten the pipe nut with the ring gasket on the bell.

Stage (III): Use a pipe wrench and open ended wrench.

10. Check the joint.

Check the pipe bell for correct and tight fit.

Making a Pipe Joint