What Are The Thread Parameters Of Fine Thread Nuts
Feb 06, 2025
There are many types of nuts, but fine toothed nuts are indeed one of them. Fine toothed nuts are suitable for connecting high-speed rotating or moving parts. Due to their small helix angle, they have good anti loosening effect after locking or backstepping.
What are the thread parameters of fine thread nuts
Fine toothed nuts are suitable for connecting high-speed rotating or moving parts. Due to the small helix angle, they have good anti loosening effect after locking or backstepping; In addition, fine tooth nuts are commonly used for adjusting the axial clearance of machines, especially for pre tightening the spindle bearings of machine tools and adjusting the axial clearance.
Fine tooth nut: Fine tooth nut is suitable for connecting high-speed rotating or moving parts. Due to its small helix angle, fine tooth nut has good anti loosening effect after locking or backstepping; In addition, fine tooth nuts are commonly used for adjusting the axial clearance of machines, especially for pre tightening the spindle bearings of machine tools and adjusting the axial clearance. When using fine toothed nuts, we must focus on the tension and strength to prevent the lifespan of the nuts from being shortened due to uncertain factors and operating standards, which may lead to uncertain factors during maintenance. What are the nut parameters of the fine tooth nut? The nut parameters can provide us with some remedial measures to avoid operational errors during use.
The methods for detecting the female thread of fine tooth nuts include:
1. Measurement of thread angle
Thread angle, also known as tooth profile angle. The measurement of thread angle can be achieved by measuring the side angle, which is the angle between the thread side and the vertical plane of the thread axis. The approximate contour of the threaded tooth is sampled on both sides of the straight line segment of the thread, and the sampling points are subjected to linear least squares fitting.
2. Measurement of pitch
Pitch refers to the distance between a certain point on a thread and the corresponding point on adjacent threads. Measurement must be parallel to the thread axis.
3. Measurement of thread pitch diameter
The pitch diameter of a thread is the distance along the pitch diameter line perpendicular to the axis, and the pitch diameter line is an imaginary line.
What are the thread parameters of fine thread nuts
Detection system
1. Hardware system: The thread parameter automatic detection system is based on PC architecture and mainly consists of lighting system, CCD camera and optical imaging system, image acquisition card, image processing system, mechanical detection system, and electrical control system.
When measuring, after being illuminated by the lighting system, the thread image of the fastener is captured by a CCD camera and an optical imaging system. Then, the digital image is transmitted to the computer through an image acquisition card. The computer processes the digital image according to the corresponding algorithm, calculates the parameters such as tooth profile angle, pitch, and pitch diameter of the thread, and compares them with the standard to calculate the deviation.
2. Software system: The software system for automatic detection of thread parameters mainly includes system control module, image processing module, etc.
System control module: initialization; Complete the initialization configuration of the system image interface card and standard parameters. Image manipulation; Collect and save an 8-bit gray image, capture the image to memory.
Image processing module: The image processing module includes image preprocessing algorithms for reducing noise and highlighting thread contour edge information, edge detection and extraction algorithms for detecting and extracting contour edge information, system calibration algorithms for measuring the actual size of digital images, and algorithms for calculating thread parameters.
Measurement results
Using machine vision technology, design an automatic detection system for measuring thread parameters, and measure parameters such as thread angle, pitch, and pitch diameter of standard thread samples. The measurement results indicate that the thread parameters are within the specified error range. Due to the efficient and reliable characteristics of visual inspection, it is believed that it can be used in production practice after further investigation.
What are the thread parameters of fine thread nuts
The profile shape of the thread on the section passing through the axis of the screw thread is called the tooth profile. The angle between adjacent tooth profiles is called the tooth profile angle. The commonly used thread profile for ordinary threads is a triangle with a profile angle of 60 °.
Parameters of fine tooth nut mother hole:
M1 0.25 0.75 # 1 64 1.55 # 0 80 1.30
M2 0.40 1.60 # 2 56 1.83 # 1 72 1.60
M2.5 0.45 2.05 # 3 48 2.10 # 2 64 1.90
M3 0.50 2.50 # 4 40 2.35 # 3 56 2.10
M4 0.70 3.30 # 5 40 2.65 # 4 48 2.40
M5 0.80 4.20 # 6 32 2.85 # 5 44 2.70
M6 1.00 5.00 # 8 32 3.50 # 6 40 3.00
M7 1.00 6.00 # 10 24 3.90 # 8 36 3.50
M8 1.25 6.80 1.00 # 12 24 4.50 # 10 32 4.10
M9 1.25 7.80 1.00 1/4" 20 5.20 # 12 28 4.70
M10 1.50 8.50 1.25 1.00 5/16" 18 6.60 1/4" 28 5.50
M12 1.75 10.20 1.50 1.25 3/8" 16 8.00 5/16" 24 6.90
M14 2.00 12.00 1.50 7/16" 14 9.40 3/8" 24 8.50
M16 2.00 14.00 1.50 1/2" 13 10.80 7/16" 20 9.90
M18 2.50 15.50 1.50 9/16" 12 12.20 1/2" 20 11.50
M20 2.50 17.50 1.50 5/8" 11 13.50 9/16" 18 12.90
M22 2.50 19.50 2.00 3/4" 10 16.50 5/8" 18 14.50
M24 3.00 21.00 2.00 1.50 7/8" 9 19.50 3/4" 16 17.50
M27 3.00 24.00 2.00 1.50 1" 8 22.25 7/8" 14 20.25
M30 3.50 26.50 2.00 1 1/8" 7 25.00 1" 12 23.25
M33 3.50 29.50 2.00 1.50 1 1/4" 7 28.25 1 1/8" 12 26.50
M36 4.00 32.00 1 3/8" 6 30.75 1 1/4" 12 29.50
M42 4.50 37.50 1 1/2" 6 34.00 1 3/8" 12 32.50
M48 5.00 43.00 1 3/4" 5 39.50 1 1/2" 12 36.00
2" 4 1/2 45.00
Let me explain, the ones starting with'm 'are all metric, while those starting with'm' are in the imperial system. In Chinese factories, metric systems are mostly used, so taking metric systems as an example, the pitch of M48 is 5mm, and the diameter of the bottom hole is 43mm, which is the size of the drill bit you choose.
Coarse thread can be understood as the thread with the maximum allowable pitch P selected when the thread specification is determined. For example, for M12 thread specifications, the pitch can be selected from 1.75, 1.5, and 1. M12 × 1.75 refers to coarse thread, while M12 × 1.5 and M12 × 1 refer to fine thread. For coarse thread, the annotation of its pitch term can be omitted. (All examples are metric threads)
