What are the thread specifications?

For example: M24 3

M stands for thread shape: M stands for triangular thread, TR stands for body thread, G stands for cylindrical pipe thread, Zg stands for conical pipe thread, Z stands for American 60 degree conical pipe thread, etc.

24 represents the nominal diameter.

3 represents pitch.

M24 3-3:-3 stands for Level 3 accuracy.

TR32 12 2-3: trapezoidal thread, nominal diameter 32, lead 12, pitch 6, number of heads 2,-3 level accuracy.

TR32 6-2LH: trapezoidal thread, nominal diameter 32, pitch 6, lh stands for left-handed thread, -3 grade accuracy.

In the old national standard, there was a "z" thread marking, but the "z" represented a "conical thread" instead of a "tapered pipe thread."

The expression of "tapered pipe thread" is "zg".

The difference between "z" and "zg" is that the profile angle of "z" is 60°, while the profile angle of "zg" is 55°. The other following parameters are expressed in the same way, and they are all nominal diameters.

The thread is used for an approximation of the bore diameter of the tube, not the outer diameter of the tube), imperial.

In the current national standard, the "conical thread", that is, "Z", the full name of the current cone pipe thread is "the tapered pipe thread sealed with threads", using "R" and "RC" two representation methods, where "RC" represents the inner pipe thread, "R" represents the outer pipe thread.

The diameter and pitch of the thread.

Here is a spec sheet of some common standard sizes for metric threads:

1. The thread diameter is, and the pitch per millimeter is.

2. The thread diameter is 2mm, and the pitch per millimeter is.

3. The diameter of the threaded trousers is and the pitch per millimeter is.

4. The thread diameter is 3mm, and the pitch per millimeter is.

5. The thread diameter is 4mm, and the pitch per millimeter is.

6. The thread diameter is 5mm, and the pitch per millimeter is.

7. M6X1: The thread diameter is 6mm, and the pitch per millimeter is 1mm.

8. The thread diameter is 8mm, and the pitch per millimeter is.

9. The thread diameter is 10mm, and the pitch per millimeter is.

10. The thread diameter is 12mm, and the pitch per millimeter is.

The three elements of the thread:

1. Number of threads: The number of spirals forming threads is called the number of threads. There are single threads and multi-threads, and the multi-threads are evenly distributed within the profile perpendicular to the axis.

2. Pitch and guide spine sales:

The distance between adjacent teeth in the axial direction of two points on the mid-diameter line is called the pitch. On the same spiral line, the distance between the two adjacent teeth corresponding to the axial direction of the two points on the middle diameter of the Hu trace is called the lead. The relationship between the number of lines n, the pitch p, and the lead s is: s=n p.

3. Rotation direction: Looking along the axis direction, the thread that rotates clockwise becomes the right-handed thread, and the thread that rotates counterclockwise is called the left-handed thread. If the thread is vertically viewed, the visible part of the thread rising to the left is a left-handed thread, and the visible part rising to the right is a right-handed thread<>

The standard size specification table of threads is as follows:1. American screws:

American screws are generally marked with numbers, such as ex: 2-56 (:2 56 teeth.

ex: 4-40 (:4 40 teeth.)

ex: 6-32 ( 6 pan 32 teeth.)

ex: 8-32 ( 8 pan 32 teeth.)

ex: 10-24 (:10 24 teeth.)

2. Inch screws:

The denominator is 8, and then the numerator is directly called.

ex: 1 8 x : 1 split thread screw x length, ppb.

ex: 5 16 x x: 2 minutes and a half screws x length, ppb.

ex: 5 32 x x : 1 minute 2 and a half centimeter screws x length, ppb.

ex: 1 4 x x : 2 points screw length, ppb.

The standard size of the thread comes from.

The standard size of ordinary screw threads is divided into more than 10 grades, and the intermediate and above bolts are made of low-carbon alloy steel or medium-carbon steel and heat-treated, commonly known as high-strength screws, and the rest are commonly referred to as ordinary screws.

French engineer Renaud saw that there were many specifications of wire ropes on hot air balloons, so he thought of a way to open 10 to the 5th power to get a number, and then multiply them to get 5 priority numbers: .

The specification table of the thread standard ruler is as follows:

American screws are generally marked with numbers, such as ex: 2-56 (:2 56 teeth.

ex: 4-40 (:4 40 teeth.)

ex: 6-32 ( 6 pan 32 teeth.)

ex: 8-32 ( 8 pan 32 teeth.)

ex: 10-24 (:10 24 teeth.)

The standard size of the thread comes from.

The standard size of ordinary screw threads is divided into .There are more than 10 grades such as 9, and the intermediate and above bolts are made of low-carbon alloy steel or medium-carbon steel and heat-treated.

French engineer Renaud saw that there were many specifications of wire ropes on hot air balloons, so he thought of a way to open 10 to the 5th power to get a number, and then multiply them to get 5 priority numbers: . 3。<>