High strength nut grade 8.8 blackened hexagonal nut Q235 with multiple material specifications

"Bolt inspection can be divided into two types: manual and machine. Artificial detection is the most primitive and commonly used method of consistent detection. In order to minimize the outflow of defective products, general production enterprise personnel inspect the packaged or shipped products visually to eliminate defective products (including tooth injuries, mixing, rust, etc.). [2]
Another method is fully automatic machine testing, mainly magnetic particle testing. Magnetic particle inspection utilizes the interaction between the leakage magnetic field at the bolt defect and the magnetic particle. In response to the difference in magnetic permeability between the bolt's possible defects (such as cracks, slag inclusions, mixed materials, etc.) and the steel's magnetic permeability, the magnetic field at the discontinuous parts of these materials will undergo distortion after magnetization, forming a leakage magnetic field on the surface of the workpiece at some magnetic flux leaks, thereby attracting the magnetic particle to form a magnetic particle accumulation at the defect - magnetic marks. Under appropriate lighting conditions, Showing the location and shape of defects, observing and explaining the accumulation of these magnetic particles has achieved the goal of eliminating defective products"

"Advantages of Lock Washers Editing
1. Ensure that the clamping force of the connecting piece is still maintained under strong vibration, which is superior to fasteners that rely on friction from the lock;
2. Prevent bolt looseness caused by vibration and eliminate related issues caused by loose fasteners;
3. No special installation work is required, making it easy to install and disassemble;
4. Changes in temperature will not loosen the connectors;
5. It has durability;
6. It can be reused"

A flat gasket is a type of gasket with flat upper and lower end faces. It is used in automotive differentials and is installed between the differential housing and the gear, like a spherical gasket, to reduce friction and improve lubrication. The differential should adapt to severe bumps and be able to operate at high speeds for a long time in high and low temperature environments. Due to the fact that both ends of the flat gasket currently used in the differential are smooth, or only one side of the flat gasket has a small concave point, during the high-speed operation of the differential, the lubrication of the contact surface of the flat gasket is not ideal, and the friction between the contact surfaces is large, which is prone to faults.

"The annotation format for thread markings is:
Thread code - Thread tolerance zone code (pitch diameter, top diameter) - Thread length
l) The tolerance zone code is represented by numbers and letters (upper case letters for internal threads and Minuscule for external threads), such as 7H, 6g, etc. It should be noted that 7H, 6g, etc. represent thread tolerances, while H7, g6 represent cylinder tolerance codes.
2) The rotation length is specified as short (represented by S), medium (represented by N), and long (represented by L). In general, the thread fitting length is not indicated, and the thread tolerance zone is determined based on the moderate fitting length (N). If necessary, the screw length code S or L can be added, such as "M20-5g6g-L". When special needs arise, the numerical value of the spinning length can be indicated, such as "M20-5g6g-30""

Self locking nuts generally rely on friction, and their principle is to press the embossed teeth into the preset holes of the sheet metal. Generally, the hole diameter of the square preset hole is slightly smaller than that of the rivet nut. Connect the nut to the locking mechanism. When tightening the nut, the locking mechanism locks the ruler body and the ruler frame cannot move freely, achieving the purpose of locking; When loosening the nut, the locking mechanism disengages the ruler body and the ruler frame moves along the ruler body