Common Questions and Answers about Servo Motor Bearings

In the entire process of purchasing, selecting, and using servo motor bearings, overseas customers often encounter a series of questions such as precision pricing, model matching, quality inspection and after-sales service. To help you clear obstacles quickly and reduce communication costs, we have compiled a list of high-frequency questions and provided clear answers based on the actual business. Whether you are a novice in selection or a seasoned purchaser, this FAQ can provide you with practical references.

1. Procurement Selection category: Precisely match your needs and avoid selection pitfalls

(1)How much is the price difference for servo motor bearings of different precision grades P2/P4/P5?

The price differences of different precision grades are mainly due to the complexity of the processing technology and the strictness of the inspection standards, as follows:

Grade P5 (General Precision) : Basic model, with relatively mature processing technology and the lowest price, it is a cost-effective choice for automated production lines and ordinary machine tools;

P4 grade (High Precision) : It requires ultra-precision grinding processing and strict dynamic balance testing. Its price is 30%-50% higher than that of P5 grade. It is suitable for high-precision scenarios such as CNC machine tool spindles and industrial robot joints.

P2 (Ultra-precision) : The machining accuracy is controlled below the micrometer level. Multiple inspection procedures are required to remove defective products. The price is 50%-80% higher than that of P4. It is mainly used in cutting-edge fields such as aerospace and semiconductor equipment.

Note: There is no need to blindly pursue high grades. Selecting based on the actual precision requirements of the equipment can significantly reduce procurement costs.

(2) How to determine if the bearing is compatible with my servo motor? Look at four key parameters at the core to ensure compatibility:

l Size parameters: The inner diameter of the bearing should match the motor shaft diameter, and the outer diameter and thickness should match the space of the motor bearing housing;

l Performance parameters: The rated speed of the bearing should be ≥ 1.2 times the rated speed of the motor, and the rated dynamic load should be ≥ 1.5 times the actual load of the motor;

l Operating parameters: High-temperature resistant bearings should be selected for high-temperature environments,

electro-corrosion-resistant bearings for high-pressure scenarios, and sealed bearings for damp and dusty environments;

l Installation parameters: Confirm the fit tolerance of the bearings (inner ring transition fit H7/k6, outer ring clearance fit H7/h6 is recommended).

We offer a free selection service. You only need to provide motor model and working condition information to get an exact match.

(3)What is the minimum order quantity for custom bearings? How long is the delivery cycle?

Standard model: No minimum order quantity, overseas warehouse in-stock model supports a minimum order of 1 set, delivery within 3-5 days;

Customized models (such as thin-walled structures, special coatings, non-standard sizes) : minimum order quantity of 500 sets, regular customization cycle 15-20 days, urgent order can be shortened to 10 days;

Special condition customization (such as deep sea, high temperature, high pressure) : To be evaluated based on the technical solution, minimum order quantity and cycle can be negotiated.

2. Quality Inspection: Control the quality checkpoint and purchase cross-border with confidence

(1) What is the quality inspection process for overseas orders? Is third-party inspection supported?

We implement a "5-level inspection standard" for overseas orders to ensure that 100% of the products meet the requirements

Raw material inspection: The bearing steel is subject to spectral analysis to ensure that the composition meets the standard and to eliminate inferior materials;

Production process sampling: 10 percent of semi-finished products are sampled from each batch to test indicators such as processing accuracy and raceway roughness;

Full inspection of finished products: All finished products must undergo radial runout testing, dynamic balance testing, life

simulation testing, and non-conforming products are directly removed;

Factory re-inspection: Recheck the model, precision grade and

packaging integrity before shipment to ensure consistency with the order;

Third-party inspection: SGS, BV and other authoritative institutions are supported for inspection. The inspection fee can be negotiated and the report will be sent with the shipment.

3. After-sales guarantee: Eliminate your worries and achieve long-term cooperation

（1） How long is the warranty period for servo motor bearings? What does the warranty cover?

Warranty period: 12 months for standard models and 18 months for customized models, both from the date of product receipt;

Warranty coverage: Covers only material defects and processing issues of the bearing itself, such as raceway pitting, substandard accuracy, cage cracking, etc.

Non-warranty coverage: Damage caused by human installation damage, overloading operation, improper lubrication, poor protection in harsh environments, etc.

（2） What is the claim process for quality problems in overseas orders?

The overseas claim process is simple and efficient. There is no additional cost for the customer throughout the process. Free replenishment is available. For customers in need, our engineers will solve the problem on the spot as soon as possible. The specific steps are as follows:

 Problem feedback: The customer takes photos of the damaged bearing, provides information on operating conditions, and gives feedback via email or online customer service;

Technical verification: Our technical team responds within 1 hour and provides a fault analysis report within 24 hours;

Solution: If it is confirmed to be a product quality issue, arrange for the overseas warehouse to reissue a new product within 48 hours, or a full refund;

Logistics guarantee: We will cover the logistics costs for reissued products. For urgent orders, we can use the express air freight

channel.

（3） Do you offer technical support for installation and maintenance?

- Free installation manuals, lubrication guidelines and troubleshooting videos are provided.
- Support video connection for installation guidance, solving problems such as coaxiality calibration and preload adjustment;
- Regularly visit customers, provide maintenance suggestions, and help extend the service life of bearings.

Conclusion: Your questions, we'll answer

The above is a summary of the high-frequency questions about servo motor bearings from overseas customers. If your question is not on the list, feel free to contact our overseas business team at any time and we will provide you with one-on-one professional answers.