Overview
| brand | Cantonese snail | Nominal diameter | two |
| length | ten | material quality | Stainless steel A450 |
| Applicable scope | Automotive Fasteners | producing area | Huizhou |
| colour | colour | Functional purpose | |
| Packaging specifications | fifty | model | M2 * 10 |
| Customized or not | no | Order number | Yue Luo-132 6870 6820-14803 |
| Standard type | European Standard | Delivery time | Within 72 hours |
| Performance level | 4.8 level | Material grade | Copper and copper alloys |
Product Details
"4. Manufacturing and assembly
Due to manufacturing technology limitations and precision reasons, there may be sharp corners at the thread edges or mismatched dimensional fit between parts. During the initial assembly, there may be some fluctuations or fluctuations in the screw-in and screw-out torque, which requires a certain number of runs in order to obtain more accurate locking nut reuse characteristics"
"(1) The surface rust, oil stains, burrs on the bolt hole wall, welding burrs, etc. should be cleaned up.
(2) After treatment of the contact friction surface, it is necessary to meet the specified scratch resistance coefficient requirements. The high-strength bolts used should have matching nuts and washers, which should be used according to the matching requirements and should not be interchanged.
(3) When installing the friction surface of the treated components, it is not allowed to be contaminated with oil, soil, and other debris.
(4) During installation, the friction surface of the component should be kept dry and should not be operated in the rain.
(5) Strictly inspect and correct the deformation of the connected steel plates before installation.
(6) During installation, it is prohibited to hammer into the bolts to prevent damage to the bolt threads.
(7) An electric wrench that is regularly tested during use to ensure torque accuracy and operate in the correct tightening sequence.
Main safety technical measures
(1) The opening size of the Adjustable spanner shall be consistent with the size of the nut, and the small wrench shall not be used to add a sleeve. When working at heights, a dead wrench should be used. If a live wrench is used, a rope should be used to secure it, and people should fasten their safety belts.
(2) When assembling the connecting bolts of steel components, it is strictly prohibited to use hands to insert the connection surface or touch the screw holes. When removing and placing the pad iron plate, fingers should be placed on both sides of the pad iron plate"
"2. Low-cycle fatigue
Low-cycle fatigue refers to that the fatigue stress approaches or exceeds the yield limit of the material, the material has a certain amount of plastic deformation in each strain cycle, and the life is generally in the range of 102 to several times 104. The fatigue curve is generally ε－ N curve representation. The finite element calculation results show that after the bolt is screwed into the locking nut, the stress at the root of the threaded piece is relatively high, and the surface area is in a yielding state. However, the strain in the central area of the threaded piece root is very small, and the strain situation is relatively complex. The area with high strain at the root of the threaded piece undergoes reciprocating loading, which is prone to Low-cycle fatigue, reducing the pressure of the threaded piece and the screwing out torque"
Self tapping screws, also known as quick tooth screws, are steel quick fit fasteners that have been galvanized and passivated on the surface. Self tapping screws are commonly used for connecting thin metal plates (steel plates, saw plates, etc.). When connecting, first make a threaded bottom hole for the connected part, and then screw the self tapping screw into the threaded bottom hole of the connected part.
