What is the tolerance range of precision screws?
What is the tolerance range of precision screws?
Two-combination screw refers to a screw and a flat washer, or a spring washer, or a square washer, or a two-piece combination with an external tooth lock washer. Then there are all the standard types of two combination screws! The following is a brief introduction: 1. The second combination screw with spring washer refers to the combination screw with a spring washer. The spring washer is a spring washer specially used for combination screws, not the ordinary spring washer that we usually use. 2. The two-combination screw of the trim pad refers to the combination screw of the screw with a flat pad. The size of the flat pad and the thickness of the flat pad can be customized. Can be customized according to customer requirements. Flat pads are punched out by punching machines. 3. The combination screw with two external teeth refers to the screw with an external tooth combination screw. Many customers, especially electric power customers, use this external tooth two combination screw to break the paint and make the screws on the iron plate. All can be powered on. 4. Two combination screws with a square pad refer to a square pad with a square pressure line for the screw. This square pad crimping two combination screw is used on the terminal, and the function is used for crimping and wiring.
However, due to a radial external tension, the external tension is caused by the tightening axial force generated by the tightening torque, and the phenomenon of open ring expansion occurs, and the spring washer often breaks due to hydrogen embrittlement. The nut exerts uneven pressure on the flat washer through the spring washer. And the friction coefficient between the spring washer and the nut and the flat washer is very small, and the phenomenon of vibration, rotation and relaxation occurs.
4. Manufacturing and assembly Due to the limitations of manufacturing technology and accuracy, there are sharp corners on the edge of the thread or the dimensional coordination between parts is not coordinated. During the initial assembly, the screw-in and screw-out torque may fluctuate or fluctuate to a certain extent. After a certain number of running-in, more accurate reusability characteristics of the lock nut can be obtained.
Ordinary thread Ordinary coarse thread: Feature code M+ Nominal diameter + Rotation + thread tolerance zone code (pitch diameter, top diameter) - Rotation length Ordinary fine thread: Feature code M+ Nominal diameter * thread pitch + direction of rotation + thread tolerance With code (middle diameter, top diameter) - the length of screwing is omitted for right-handed threads, and the left-handed thread is represented by LH. M 16-5g6g means coarse thread ordinary thread, nominal diameter 16, right-handed, the thread tolerance zone is 5g in the middle diameter and 6g in the major diameter, and the screwing length is considered as the medium length. M16×1 LH-6G means fine thread ordinary thread, nominal diameter 16, pitch 1, left-handed, thread tolerance zone medium diameter and major diameter are both 6G, and the screwing length is considered as medium length. The labeling format is: feature code (cylindrical pipe thread is represented by G, conical pipe thread is represented by NPT) + size code + tolerance grade code + rotation direction G1A--LH represents inch non-threaded sealing pipe thread, size code 1in, left-handed, tolerance The grade is A grade. Rcl/2 means inch thread seal taper pipe thread, size code 1/2in, right-handed.
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