No looseness and no disconnection: universal 9-pin solderless type, universal RS232 interface 9-pin serial port, RS485 interface, RS422 interface and other DB9 type communication interfaces. All copper punching needles/pin cores are gold-plated according to industrial standards, with strong contact and stable transmission. Stable double-layer nickel plating wraps the interface part of the plug. Shell pure copper terminal: the wiring hole is large, the pressure line is tight, and the wiring/changing line is convenient. The PVC shell is resistant to oil and pressure, and the shell can be disassembled repeatedly. Name: DB9 solderless connector Model: female head with nut Rubber core: black electrostatic rubber core Pin: 24H salt spray gold-plated pure copper Shell size: length: 53mm, width: 35mm, height 19mm. Tail sleeve specifications: 5MM 7MM 9MM 10MM Features: The joint adopts 24-hour salt spray test shell, and the screw locking method is adopted, and the shell is locked more firmly.