The internal thread measuring instrument consists of a three-point measuring head and a display body. It is calibrated with a thread ring gauge and inputs the current measurement value of the thread ring gauge to measure the workpiece in a 1:1 ratio. The three-point internal thread measuring quick handle is used for measurement,Detect various typesGB(National standard)ISO(International)BS(Imperial)ANSI(American standard)DIN(German standard)JIS(Japanese Standard) Equivalent Gauge

The three-point threaded inner diameter measuring head has a humanized handle design, which can achieve stable force measurement, fast measurement speed, high accuracy, and convenient use. The all-new XT3 series features an IP67 super waterproof electronic system,Provide special thread gauges for measuring threads.Internal thread measurement, capable of measuring large diameter, medium diameter, and small diameter internal threads, with a measurement range of 4-300mm

Display accuracy: 0.001mm. In addition to providing a full range of conventional measurement products, customized solutions are also provided for special measurements in different situations, such as ball screw pair sleeve measurement and external thread measurement.

Measure thread type

According to the different purposes of the thread, it can be divided into:

1. International Metric Thread System(International Metric Thread System)

Chinese National StandardsCNSThe thread used. The tooth crest is flat and easy to turn, while the tooth base is curved to increase thread strength. The thread angle is60The metric thread can be divided into two types: coarse thread and fine thread. Representations such asM8*1.2（M:Code name,8: nominal diameter,1.25: Pitch)

2. American standard thread(American Standard Thread)

The top and root of the thread are both flat, with better strength. The thread angle is also60Degrees, specifications are expressed in terms of how many teeth per inch. This type of thread can be classified as coarse thread(NC)Fine teeth（NF）Ultra fine teeth(NEF)Level three. Representations such as1/2-10NC(1/2:Outer diameter;10Number of teeth per inch;NCCode name).

3. Unified standard thread(Unified Thread)

Developed jointly by the United States, the United Kingdom, and Canada, it is currently the commonly used British thread. The thread angle is also60Degrees, specifications are expressed in terms of how many teeth per inch. This type of thread can be classified as coarse thread(UNC)Fine teeth(UNF)Ultra fine teeth(UNEF)Representations such as(1/2:Outer diameter;10:Number of teeth per inch;UNCCode name)

4. VShaped thread(Sharp V Thread)

The top and root are pointed, with weak strength, and are not commonly used. The thread angle is60degree

5.Whitworth thread(Whitworth Thread)：

The thread used in the British National Standard. The thread angle is55Degree, represented by the symbol”W”Suitable for rolling method manufacturing. Representations such asW1/2-10.(1/2: Outer diameter;10Number of teeth per inch;WCode name)

6.Round thread(Knuckle Thread)：

For GermanyDINThe designated standard thread. Suitable for connecting light bulbs and rubber tubes. The symbol is”Rd”.

7.Pipe Thread(Pipe Thread)：

Threads used to prevent leakage are often used for connecting gas or liquid fittings. The thread angle is55Degree, can be divided into straight pipe thread code:”P. S.、N.P.S.”The code for the inclined pipe thread is”N. P.T.”Its taper is1：16, i.e. per foot3/4Inch.

8.Square thread(Square Thread)：

The transmission efficiency is high, second only to ball threads, and cannot be adjusted with nuts after wear, which is its disadvantage. Generally used for the screw of pliers and the thread of cranes.

9. Trapezoidal thread(Trapezoidal Thread)

Also known as Aikem thread. The transmission efficiency is slightly lower than that of square threads, but it can be adjusted with a nut after wear. The thread angle in metric system is30The thread angle in degrees and imperial system is29Degree. Usually used for cars>The symbol for the lead screw of the bed is“Tr”

10.Serrated thread(Buttress Thread)：

Also known as diagonal thread, it is only suitable for one-way transmission. Such as screw jacks, pressure machines, etc. The symbol is”Bu”.

11.Ball thread:

transmission efficiencyzuiGood threads are difficult to manufacture and have extremely high costs, so they are used in precision machinery such as the lead screw of CNC machine tools.

The representation method of simplified English bolts with square and fine circles

LH 2N 5/8*3-13 UNC 2A

(1) LHFor the left thread（RHFor the right thread, it can be omitted.

(2) 2NDouble thread

(3) 5/8British thread, outer diameter5/8

(4) 3 Screw length3

(5) 13Number of threads per inch13tooth

(6) UNCUnified standard thread coarse teeth

(7) 2Grade matching, external thread（3: Tight fit2: Cooperation with China1: Loose cooperation)A:External thread(Can be omitted)B:Internal thread

British thread: The size of British thread, usually represented by the number of threads per inch of length on the thread, abbreviated as

The number of teeth per inch is exactly equal to the reciprocal of the pitch, for example, per inch8The thread of the tooth has a pitch of1/8Inch. The representation of British thread is as follows: