The difference between single wire thread and double wire thread, thread single wire and double wire

Single Wire Thread: A thread with only one spiral groove on a cylinder is called a single wire thread.

Double thread: Double thread, also known as double-ended thread, refers to two spirals on a cylinder.

A spiral-shaped, continuous raised section with a specific cross-section made on the surface of a cylindrical or conical parent body. Threads are divided into cylindrical threads and tapered threads according to their parent shape; According to its position in the matrix, it is divided into external thread and internal thread, and according to its cross-sectional shape (tooth shape), it is divided into triangular thread, rectangular thread, trapezoidal thread, zigzag thread and other special shape threads.

2. The code of the thread:

In the standard thread marking method specified in the national standard, the first letter represents the thread code, for example: M represents the ordinary thread, G represents the pipe thread that is not threaded sealed, R represents the pipe thread sealed with thread, TR represents the trapezoidal thread, etc. The second number indicates the nominal diameter of the thread, which is the greater diameter of the thread.

It represents the maximum diameter of the thread in millimeters. The symbols after that are the pitch, rotation, middle diameter tolerance code, top diameter tolerance code, and screwing length code.

M6 stands for a common thread with a nominal diameter of 6mm.

The thread formed along a helix is called a single thread.

The thread formed along two helixes that are equally spaced axially is called a double thread. Fig.

Rotate one of the lines and you'll know. If there is an extra line in the middle, it is a double line.

One is single-line and one is double-lined.

You can just look at the above cross-section with a few threads of the exit line, that is, the thread of several threads.

It's a very simple and convenient way, hehe.

Threaded single wire and double wire, the difference is as follows:

The thread of only one spiral groove on the cylinder is called a single wire thread, the thread with two spiral lines on the cylinder is called a double wire thread, the single wire thread is not easy to slide because of its small spiral rise angle, the friction formed by the screw and nut screwing is larger, the thread has self-locking ability, the double wire thread lead is 2 times that of the single wire thread lead, but after the thread lead is larger, the self-locking ability decreases.

Benefits of Double Wire Thread vs. Single Wire and Baby Thread:

The number of heads of a thread is the number of strands that form the spiral of the thread. Due to its small spiral rising angle, the single-wire thread is not easy to slide, and the friction formed by the screw and nut screwing is larger, and it has the ability to self-trivialize, and is used for the locking of threads, such as the screw nut that fixes the ceiling fan, the joint of the gas cylinder and the fixed connection between the parts in the mechanical equipment. The multi-wire thread is easy to slide due to its large thread lifting and burial angle, and the friction formed by the screw and nut screwing is small, and the liquid is used to transmit power and movement, such as the jack used for raising the wheel maintenance, the vice used for clamping the workpiece for fitter processing, and the lathe screw rod used for processing threads.

Double-wire thread, also known as double-ended thread, refers to the two spirals on the cylinder.

1. Turn the first thread line according to the normal way of turning the snail dust and regretting the pattern, and pay attention to the thread pitch is the lead distance. That is, pitch*2

2. Send a pitch to the retract in the Z direction, and then turn the second thread.

Example: M20*3 (i.e., ordinary triangular thread, nominal diameter is 20, tooth spacing is a double wire thread.)

The double thread is just said to be the same screw with two threads on the rod, and the pitch can be determined.

And the threads are large and small, and there are many pitches.

The thread formed along one helix is called a single thread, and the thread formed by two or more helixes distributed equally along the axial direction is called a multi-thread thread. The following diagram shows the single wire thread and the double wire thread. <>

A simple experiment to distinguish between the two: use two small pieces of paper of two colors to cut two identical small right-angled triangles, then find a round bar, and roll the axis of a vertical round bar on the right-angled side of the paper on the round bar, and the spiral formed by the hypotenuse is a single-wire thread; Then the two triangular pieces of paper were slightly misaligned and rolled on the round bar, and the two beveled edges formed a double thread.

The single line is a single-head thread, the double-main hall line is a double-headed thread, and the pitch is the same, such as M10 is the pitch, and the pitch of the socks is double-ended.