Inch nut refers to the nut size with the imperial system mark, according to the shape of cylindrical, conical two; according to the tooth angle is 55 °, 60 ° two. Inch nut in the 1/4, 1/2, 1/8 mark refers to the diameter of the inch nut size, the unit is inches. An inch is equal to 8 points, 1/4 inch is 2 points, and so on.

What is the difference between imperial nuts and metric nuts?
1. the tooth angle is different, you can use the thread gauge to measure the thread, the common metric thread is 60 degrees, while the imperial thread is generally 55 degrees (but the imperial also has a 60 degree tooth thread).

2. you can take a metric screw to try to screw, can be screwed in is definitely metric nuts. Most people must be very clear, the national standard metric nut diameter is generally integers, such as M3, M4, M6, etc., while the imperial nut is expressed differently, 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 big the screw needs.

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

Measurement method of nuts

1、Measurement of thread angle
The thread angle 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 a straight line section on both sides of the thread, and a linear least squares fit is performed on the sampled points.
2、Pitch measurement
The pitch is the distance between a point on the thread and the corresponding point on the adjacent threaded tooth. The measurement must be parallel to the thread axis.
3、Measurement of the thread median
The median diameter of a thread is the distance along the median line perpendicular to the axis.