What is the difference between thread gauge 6H and H2

Tolerance classThe difference between the warp and the tolerance is not the same.

When using: it should be noted that the tolerance grade and deviation code of the tested thread are the same as those of the ring gauge identification. (If the shape of the two ring gauges of M24* and M24* is the same, and the thread tolerance zone is not the same, a batch of unqualified products will be produced after misuse).

Inspection and measurement process: First of all, we must clean up the oil and impurities of the tested thread, and then after the ring gauge is aligned with the tested thread, turn the ring gauge with the index finger and screw in the thread length at 2 pitches.

It is qualified within it, otherwise it is judged to be a non-conforming product. Precision instruments are very important for the development of science and technology.

These limit deviations apply to:

1) Linear size: such as outer size, inner dimension, step size, diameter, radius, distance, rounding radius and chamfer.

Height. 2) Angular dimensions: including angular dimensions that are not usually marked with angular values, such as right angles (90°); Linear and angular dimensions of machined assemblies.

These limit deviations do not apply in the following cases:

1) There are other general tolerance standards.

Specified linear and angular dimensions.

2) Reference dimensions in parentheses.

The difference between the tolerance grades is not the same as the middle warp tolerance.

The number in the thread tolerance zone is the tolerance class, and the smaller the number, the higher the accuracy class, and the smaller the tolerance range. For example, for the middle diameter of the M6 external thread, the tolerance range is 90 microns for grade 5 and 112 microns for grade 6. The letters are the range of the tolerance baseline...

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1. First of all, we understand that the thread tolerance of 5h and the thread tolerance of 6h refer to the tolerance code of the external thread.

2. Secondly, we want to know the tolerance value of a certain thread specification, which can be obtained by checking the relevant manuals or calculations, such as.

The large diameter tolerances of m20 are; The middle diameter tolerance is.

The large diameter tolerance of M20 2-6h is; The middle diameter tolerance is.

2. Can 6h be used instead of 6h?

This is a conceptual error, 6h is not a substitute for 6h. Because the thread tolerance of 6h refers to the tolerance class of the internal thread.

How much can you go to check the tolerance table, according to the tolerance zone, h6 under tolerance, h6 is the upper tolerance, usually the thread on the screw adopts the lower tolerance, and the threaded hole adopts the upper tolerance.

The threaded ring gauge has high accuracy of 6h.

It refers to the middle diameter tolerance of the thread, where the number refers to the accuracy it, that is, the width of the tolerance zone, and the tolerance zone range of IT6 is small, and the accuracy is higher than that of IT7.

The letter h indicates the position of the tolerance zone, which is the basic deviation value, and the two types of hs indicate that the basic deviation of the thread is the same.

The lowercase letter indicates that the tolerance of the external thread is marked, so 6h and 7h indicate not the accuracy of the ring gauge, but the tolerance range of the external thread to which the ring gauge applies. What cannot be replaced or exchanged is that each has its own use. There is no ring gauge precision involved.

When using a threaded ring gauge: it should be noted that the tolerance grade and deviation code of the tested thread are the same as the tolerance grade and deviation code marked by the ring gauge (for example, the shape of M24* and M24* ring gauges is the same, and the thread tolerance zone is not the same, and a batch of unqualified products will be produced after misuse, of which 6h and 5g are thread accuracy).

Inspection and measurement process: First of all, we must clean up the oil and impurities of the tested thread, and then after the ring gauge is aligned with the tested thread, rotate the ring gauge with the big female finger and index finger to make it screw in a free state and pass the full length of the thread to determine that it is qualified, otherwise it will not be judged.

High accuracy of 6h.

1. Thread plug gauge: It is a tool to measure the correctness of the size of the internal thread. Our plug gauges are special tools for testing the standard of rebar connection sleeve joints.

According to the sleeve used in each construction site, there are two kinds of tooth angle 75 degrees and 60 degrees, please clarify the tooth angle and pitch of your own sleeve before purchasing. Threaded plug gauge (bolt gauge), the same specification has two ends used as a set at the same time, which is the pass gauge and the stop gauge. 1. Test screwing with a general gauge, if you can't screw it in, it will be unqualified, and there is no need to use the stop gauge at this time, because it is already a defective product.

2. Test screwing with a general gauge, if you can screw it in, and then use the stop gauge to screw, if the stop gauge can not be screwed in or only screw in one or two tooth gauges, it is qualified. 3. Test screwing with a general gauge, if you can screw in, and then use the stop gauge to screw, if the stop gauge can not be screwed in or can only be screwed into one or two teeth, that is qualified.

2. Thread ring gauge: It is a tool to measure the correctness of the size of the external thread. Our ring gauges are special tools for checking the standard of rebar connection heads.

According to the sleeve used in each construction site, there are two kinds of tooth angle of 75 degrees and 60 degrees, please clarify the tooth angle and pitch of your own production wire head before purchasing. The thread ring gauge is used to check whether the external thread size of the workpiece is qualified. Each specification of the threaded ring gauge is divided into two types: general gauge and stop gauge, which can be purchased separately or together (marked ** as a model of a general gauge or a gauge of the gauge**).

During the inspection, only when the general gauge can be screwed with the external thread of the workpiece, and the stop gauge is only partially screwed with the external thread of the workpiece, and the amount of screwing does not exceed two pitches, the external thread can be judged to be qualified; In addition, it can be judged that the external thread size is unqualified. The thread ring gauge is to detect the quality of the external thread, it only tests whether the external thread can meet the requirements of use. Threaded ring gauges such as:

To test whether the thread of M25 pitch meets the process requirements, it is to use the M25* thread ring gauge (there are two kinds, one is the general gauge and the other is the stop gauge) to pass the gauge and stop the gauge to prove that the processed thread is qualified.

The smaller the number, the more precise the machining, with a minimum of 1 grade and a maximum of 13 grades.

The position of the tolerance zone is different.

The 6G thread is larger than the 6H thread, and the difference between the thread gauge and the 6G thread gauge is the position of the tolerance zone.

Precautions for using thread gauges:

1. When selecting a thread gauge, you should choose the specifications that match the thread to be measured (including thread specifications, pitch, and accuracy).

2. Before use, clean up the oil stains and impurities on the surface of the thread gauge and the tested thread.

3. When using, after the through end (end end) of the thread gauge leakage and the thread to be tested are corrected, take Souyou to rotate the thread gauge or the measured part with your thumb and index finger to make it rotate in a free state.

4. Under normal circumstances (when there is no illustration of the thread of the tested part), the general gauge of the thread gauge (through end) can be rotated at any position of the thread to be measured, and it is judged to be qualified if it passes the full thread length, otherwise it is a non-conforming product.

5. After the stop gauge of the thread gauge (end end) is aligned with the tested thread, the length of the thread screwed in is stopped within 2 pitches to be qualified, and it cannot be forcibly passed, otherwise it will be judged as a unqualified product. <>

Thread 6h is a way of expressing the tolerance zone code.

6 indicates the tolerance class, and H represents the internal thread. The tolerance zone code is represented by numbers and letters (uppercase letters for internal threads, lowercase letters for external threads), such as 7h, 6g, etc., it should be specifically pointed out that 7h, 6g, etc. represent thread tolerances, while h7, g6 represent cylindrical tolerance codes. With the exception of pipe threads, thread marks are annotated in the same way as linear dimensions in the view; The pipe thread is in the form of a finger and side shirt lead, and the guide line should be drawn from the large diameter and should not be parallel to the section line.

A thread is a continuous convex part of a specific cross-section made in the shape of a helix made on the surface of a cylinder or conical matrix. 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.

Common thread callouts:

1. M-the most commonly used connection thread, when the diameter is the same, the pitch of the fine thread is smaller than that of the coarse thread, and the coarse thread does not note the pitch.

2. The common thread in the G-pipe connection has a small pitch and tooth shape, and its size code is in unit, which is approximately equal to the aperture of the pipe.

3. The RC-seal thread can keep the inner and outer boundaries of the pipeline joint sealed under a certain pressure.

4. TR - two commonly used transmission threads for transmitting motion and power, trapezoidal threads can transmit two-way power, and zigzag threads are used to transmit one-way power.

The above content reference: Encyclopedia - Luocha cavity pattern 6h <>

The difference between thread 6h and 7h is that the main difference is in the tolerance zone.

The accuracy of the 6H thread is higher than that of the 7H thread, 6H is the external thread, 7H is the internal thread, and H refers to the position of the thread tolerance zone, which is generally not used as a surface coating or a very thin phosphate layer.

The basic deviation of the g position is usually used in special cases, such as thick plating, and is rarely used.

The difference between screws, nuts, nuts, bolts, screws, and studs: The standard saying is that there are no screws and nuts. Screws are commonly known as screws, and those with external threads can be called screws.

The shape of the nut is usually hexagonal, and the inner hole is a high internal thread, which is used to cooperate with the bolt and tighten the related parts. The nut is commonly known, and the standard should be called the nut.

Screw principle: A screw is a tool that gradually tightens objects and parts through the physical principle of the friction of the object and the oblique circumferential rotation of the object. Screw is a general term for fasteners, a word used daily by the Qi people.

Screws are essential industrial necessities in our daily lives, such as very small screws used in cameras, glasses, watches, and electronics.

The head of the bolt is generally hexagonal with an external thread on the rod. The screws are smaller, the head has a flat head, crosshead, etc., and the rod part has an external thread. The stud should actually be called a double-ended stud, with external threads at both ends, and a smooth rod in the middle.

The long end of the thread is used to connect with the deep cover cherry hole, and the short section is connected to the nut. <>

Dear, glad to answer for you. What is the difference between 5H and 6H for threaded plug gauges? A:

The difference between the 5h and 6h thread plug gauges is the difference between the gongliangzhou difference zone. The diameter of the thread plug gauge 6h is greater than the 5h stop gauge, the 5h stop gauge must be stopped for 6h, and the 6h stop gauge must not be stopped for 5h. There are thousands of epidemic prevention measures, and the first one is to wear a mask.

When traveling, drivers and passengers must wear masks during the whole trip.

The size is different. The 6g thread is larger than the 6h thread, and it is about as large as the pitch is different. For example, pitch, large; pitch, large; Pitch 8, large.

The internal thread inspection is to use the thread plug gauge, a set of two pieces (a general gauge, a stop gauge), the thread qualification judgment rules: the general gauge can be screwed into the internal thread, and the stop gauge is only allowed to screw into the internal thread at most 2 buckles. (can check to GB T3934, common thread gauge technical condition).

The commonly used grade of the external thread is 6g, (if the external thread is not marked with the tolerance zone grade, it means that the snail stuffy pattern is 6g). The commonly used grade of the internal thread is 6H, (if the internal thread is not marked with a tolerance zone with a ruined grade, it means that the thread is 6H).

6g and 6h both indicate the tolerance zone code, the detection is 6g and 6h of the external thread, if it is an internal thread, his tolerance grade is represented by an uppercase h or g, and the internal thread inspection is with a thread plug gauge.