How should a double end threaded rod be maintained on a daily basis, and under what circumstances does it require replacement?

Why Daily Maintenance of  double threaded rod Is Indispensable?

The thread surface is worn too fast, resulting in increased backlash, reduced positioning accuracy, and failure to meet the equipment’s work requirements;

Lack of lubrication leads to increased friction between the nut and the lead screw, causing abnormal noise, overheating, and even jamming during operation;

Dust, debris, and moisture enter the thread gap, causing corrosion and wear of the lead screw and nut, shortening the service life;

Failure to detect potential faults in time leads to sudden damage of the lead screw during operation, resulting in equipment shutdown, affecting production progress and increasing maintenance costs.

scientific daily maintenance can extend the service life of double ended lead screws by 30%~50%, and effectively reduce the frequency of replacement and maintenance costs.

Daily Maintenance Guide for double end threaded rod (Easy to Operate)

The specific steps are divided into three levels: daily care, weekly inspection, and monthly maintenance.

1. Daily Care (10 Minutes per Day, Must Do)

Daily care is the foundation of extending the service life of double end threaded rod, mainly to prevent dust, debris, and other impurities from entering the thread gap and avoid dry friction. The specific operations are as follows:
- Cleaning: After the equipment stops running every day, use a clean soft cloth to wipe the surface of the double end threaded rod and the nut, remove dust, cutting chips, and oil stains on the thread surface. Do not use hard objects such as steel wire balls to wipe, so as not to scratch the thread surface and affect the transmission accuracy;
- Lubrication Check: Observe the lubrication state of the thread surface. If the lubricating grease is dry, discolored, or has impurities, apply an appropriate amount of special lubricating grease in time. It is recommended to use lithium-based grease or polyurea grease, which has good wear resistance and high-temperature resistance, and is suitable for the working environment of double end threaded rod;
- Simple Inspection: Manually rotate the threaded rods to check whether it rotates flexibly without jamming or obvious resistance; observe whether there is abnormal noise or looseness at both ends of the threaded rod and the support seat. If any abnormality is found, record it in time and deal with it.
Note: For double end threaded rod used in dusty, high-temperature, or humid environments, the frequency of daily cleaning and lubrication should be increased to avoid corrosion and wear caused by harsh environments. High temperatures can cause lubricating oil to degrade quickly, while dust can accelerate wear, requiring more frequent maintenance intervention.

2. Weekly Inspection (30 Minutes per Week, Key Check)

On the basis of daily care, weekly inspection focuses on checking the key parts of the double end threaded rod to detect potential faults in advance. The specific operations are as follows:
- Lubrication Reinforcement: Completely clean the thread surface and nut, and reapply special lubricating grease. The amount of lubricating grease should be appropriate, not too much or too little—too much will cause excessive resistance and overheating, too little will not play a lubricating role. It is recommended to apply a thin layer of lubricating grease evenly on the thread surface, which can effectively reduce friction and prevent rust;
- Support Seat and Bearing Check: Check whether the fixing bolts of the support seats at both ends are loose. If loose, use a torque wrench to lock them according to the specified torque; check the operation state of the bearing, observe whether there is abnormal noise, overheating, or looseness. If the bearing is damaged, replace it in time to avoid affecting the coaxiality of the threaded rods;
- Synchronization Check: For double end threaded rod used in bidirectional transmission, move the nut seat back and forth along the threaded rod to check whether the movement of the two nuts is synchronous, and whether there is deviation or jamming. If there is synchronization deviation, check the parallelism and coaxiality of the threaded rod in time.

3. Monthly Maintenance (1 Hour per Month, In-depth Inspection)

Monthly maintenance is an in-depth inspection and maintenance of double end threaded rod, mainly to check the wear state and accuracy, and ensure the long-term stable operation of the threaded rod. The specific operations are as follows:
- Wear Inspection: Use a dial indicator to detect the backlash of the threaded rod and nut. If the backlash exceeds 0.015mm (0.008mm for high-precision equipment) and cannot be improved by adjusting the preload nut, it indicates that the thread is worn and needs to be paid attention