Check the listing for details. Internal Thread Shaft Round Rod Roller Connecting Rod Transmission Rod Dia6-20mm. Condition: New. Listed at 2.83 USD. Description: Internal toothed guide shaft with slot Product material: 45 steelDiameter: 6mm-20mmLength: 15mm-150mmThread size: M3 M5 M6 M8 M12Product advantages: tight fitting of parts,Product attributes: Hardware machineryScope of use: Widely usedConvenient component connection: The internal thread structure allows threaded connection with components with external threads to achieve a firm combination between mechanical components. This connection method can withstand a certain amount of tension, pressure and shear force, ensuring that the connected parts will not easily separate during mechanical operation. For example, in some small mechanical equipment, an internally threaded guide shaft with a slot can connect the output shaft of the motor to the transmission device to achieve power transmission.Enhance connection stability: The design of the slot can be matched with other structures or parts to further enhance the stability of the connection. For example, installing fasteners such as circlips or pins in the slot can prevent the threaded connection from loosening due to vibration or impact and ensure the normal operation of the mechanical system. Package include:According to your choice.