Inch nut is the size of the nut with the imperial system marked, according to the shape of the cylindrical, conical two; according to the tooth angle is 55 °, 60 ° two. The 1/4, 1/2 and 1/8 marks in the inch nut refer to the diameter of the inch nut size, the unit is inch. One inch is equal to 8 cents, 1/4 inch is 2 cents, and so on.

What is the difference between imperial nuts and metric nuts?

1, the tooth angle is different, you can use a thread gauge to measure the thread, the common metric thread has a tooth angle of 60 degrees, while the imperial thread is usually 55 degrees (but the imperial one also has a 60 degree tooth thread).

2, you can take a metric screw to try to screw, can screw in is definitely metric nuts. Most people must be very clear, the national standard in the metric nut diameter are generally integers, such as M3, M4, M6, etc., while the imperial nut is expressed in different ways, such as 3/16, 3/8, 5/12, 1/8, etc., 1 inch is equal to 8 centimeters, and 1 inch is equal to the metric system 25.4mm, through the conversion will be able to know how large the screw needs to be

3. Metric threads: metric threads, in millimetres, and imperial threads: in inches.

How to measure nuts

1、Measurement of the thread angle
The angle of the thread is also called the thread angle. The measurement of the thread angle can be achieved by measuring the lateral angle, which is the angle between the side of the thread and the vertical surface of the thread axis. The approximate profile of the threaded tooth is sampled in straight sections on both sides of the thread, and a linear least squares fit is made to the sampled points.

2、Measurement of pitch
Pitch is the distance between a point on a thread and the corresponding point on the adjacent threaded tooth. It must be measured parallel to the thread axis.
3、Measurement of the median diameter of a thread
The median diameter of a thread is the distance along the median line perpendicular to the axis, the median line is an imaginary line.