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1. Thread sleeve (also known as steel wire thread sleeve or tooth sleeve) is a type of internal threaded fastener, which is a new component for repairing and strengthening internal threads. It is a spiral coil component refined and formed with high-strength and high-precision cold-rolled diamond stainless steel wire. Its product can form a standard high-precision internal thread inside the internal thread 2. The length of the screw sleeve is selected as a multiple of the nominal diameter d of the bolt installed inside it, with each type of screw sleeve having 0.75d; 1d; 1.25d; 2.0d; 2.5d; 3.0d length. For example, an M8 screw insert with a length of 1.25d can form an M8 internal threaded hole with a length of 10mm after installation. 3. Screw sleeve marking method: Example 1: The thread specification is M8; The tooth pitch is 1.25; The number of spiral rings is: 6; The screw sleeve is marked as M8 × 1.25-6k Example 2: The thread specification is M8; The tooth pitch is 1.25; The depth of the screw hole is: 12; The screw sleeve is marked as M8 x 1.25-1.5d 4. Screw sleeve material properties: Material Name | Material model | Tensile strength | Operating temperature | Surface Treatment | Stainless steel | SUS301 / 1Cr18Ni9 | 1400N/mm | 425℃(max) | Lubricant coated/uncoated | SUS304 / 0Cr18Ni9 | 315℃(min) | Chromium plating/galvanizing/silver plating | Bronze | QSn6.5-4.0 | 1000N/mm | 300℃(max) | Unplated | 250℃(min) |
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