Thread Size Chart (inch/mm)

The following methods can be used to measure thread dimensions:
Using a caliper: For general standard threads, the outer or inner measuring jaws of the caliper can be used to measure the thread diameter. However, it should be noted that there may be errors in the measurement results due to the possibility of worn or twisted threads on the connecting parts.
Using a thread gauge: Determine the number of threads per inch, and for metric joints, measure and determine the distance between threads. The specific operation is to place the thread gauge on the thread. If it fits tightly without any gaps and is transparent, it indicates that the thread gauge matches the thread.
Using the three needle measurement method: Place three measuring needles with the same diameter in the threaded groove, and then use an appropriate measuring tool (such as a micrometer) to measure the size. This method is mainly used to verify whether the pitch diameter of the processed thread is correct.
Using the double needle measurement method: For threads with large pitches (pitches greater than 6.5), using the double needle measurement method is more convenient. For ordinary thread tooth angle a=60 º, the above methods are for reference only. It is recommended to consult professional books or consult professionals for more guidance.

Yes, the diameter of a thread has a significant impact on its size. Specifically:
The size of the diameter directly determines the size of the thread. Generally speaking, the larger the diameter, the corresponding increase in thread length. This is because the diameter determines the cross-sectional area of the thread, thereby affecting its length. For example, a larger diameter may result in the need for more thread lines within the same length, which may affect the total length of the thread.
Therefore, selecting the appropriate diameter is crucial for meeting the size requirements of the thread. It is very important to understand and consider the relationship between diameter and size when designing or using threaded connections.

When choosing a thread diameter size, the following are some standards and specifications that can be referenced:
International Standards (ISO): ISO has established international standards for thread diameter, including the standard thread diameter series specified in ISO 68-1:1998 and the pipe thread diameter series specified in ISO 261:2004. These standards provide guidance for thread design and manufacturing worldwide.
American Standard (ANSI/ASME B1.1): ANSI/ASME B1.1-1991 specifies standards for American thread diameters, including standards for coarse and fine threads. These standards are widely used in industrial fields in the United States and other countries.
German Standard (DIN 13): DIN 13 specifies the thread diameter of German standards, including standards for pipe threads and threaded fittings. These standards are adopted by the industrial sector in Germany and other European countries.
British Standard (BS 3074): BS 3074 specifies the diameter of pipe threads in the British standard, including the standard for British coarse and fine threads. These standards are widely used in the UK and other Commonwealth countries.
Chinese Standard (GB): China has also developed relevant thread standards, such as GB/T 193-2003 which specifies the standard for the diameter series of ordinary threads, and GB/T 2900.7-2006 which specifies the standard for the terminology of threaded pairs in fasteners.

M10 thread size refers to the external thread diameter of a threaded fastener with a major diameter of 10mm. The M10 thread size is used in various applications, including bolts and screws. The standard M10 thread size has a pitch of 1.5mm and a thread length of 10mm. However, the actual dimensions of the M10 thread may vary depending on the specific application and manufacturer. It is important to consult the manufacturer’s specifications or use standard measurement tools to ensure accurate measurement and compatibility with other components.

10-32 thread is a common thread size in the United States, specifically referring to the external thread diameter of a threaded fastener. The number “10” represents the major diameter in inches, and the number “32” represents the number of threads per inch. Therefore, 10-32 thread has a major diameter of 0.794mm (10/8 inch) and a pitch of 0.794mm (32 threads per inch). This thread size is commonly used in various applications, including bolts and screws, and is available in both steel and stainless steel materials. When selecting or specifying 10-32 thread fasteners, it is important to ensure compatibility with other components by checking the manufacturer’s specifications or using standard measurement tools.