1. The specification of the screw insert is the same as the screw specification of the substrate, and d represents the nominal diameter; P represents pitch;2. The model of the screw sleeve should be either a regular type or a locking type according to the production and processing needs.3. The nominal length of the screw sleeve is selected based on the depth of the screw hole installed on the screw sleeve substrate, the tensile strength of the substrate, and the performance level of the screw;
Matrix tensile strength N/MM ^ 2 | Performance level of screws | Level3.6 | Level4.8 | Level5.6 | Level6.6 | Level8.8 | Level9.8 | Level10.9 | Level12.9 | ≤150 | 1.5 d | 2 d | 2 d | 2 d | 2.5 d | 2.5 d | 2.5 d | 2.5 d | 150～200 | 1.0 d | 1.5d | 1.5d | 1.5d | 2 d | 2 d | 2 d | 2.5 d | 200～250 | 1.0d | 1.5d | 1.5d | 1.5d | 1.5 d | 1.5 d | 2 d | 2.5 d | 250～300 | 1.0d | 1.0d | 1.0d | 1.0d | 1.5 d | 1.5 d | 1.5 d | 2 d | 300～450 | 0.5d | 1.0d | 1.0d | 1.0d | 1.0d | 1.5 d | 1.5 d | 1.5 d | ≥450 | 0.5d | 1.0d | 1.0d | 1.0d | 1.0d | 1.0d | 1.5 d | 1.5 d |
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Note: A screw with a performance grade of 4.6 indicates that the material of the screw has a nominal tensile strength of 400 MPa, a yield strength ratio of 0.6, and a nominal yield strength of 400 × 0.6=240 MPa
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