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LFR5200-8 KDD NPP 10mmx32mmx14mm U Groove Track Roller Bearing
In bearing models, "KDD" and "NPP" represent different sealing structures. Here are the differences between the two:
1. KDD (Double-Sided Metal Shield)
- Sealing Structure: KDD indicates that the bearing has metal shields on both sides, often referred to as "deep groove ball bearing dust covers."
- Characteristics:
- Good dust resistance, but not waterproof or oil-proof.
- The metal shield does not contact the inner ring, resulting in no friction.
- Suitable for high-speed operation due to low friction.
- Applications:
- Scenarios requiring dust protection but allowing lubrication flow.
- Examples include motors, household appliances, etc.
2. NPP (Double-Sided Contact Seals)
- Sealing Structure: NPP indicates that the bearing has contact-type seals on both sides, usually made of rubber or synthetic materials.
- Characteristics:
- Superior sealing performance, effectively preventing water, oil, or other contaminants from entering.
- Contact seals cause some friction with the inner ring.
- Suitable for low-to-medium-speed operations.
- Applications:
- Scenarios with high protection requirements, especially in the presence of moisture or oil.
- Examples include agricultural machinery, construction equipment, etc.
Summary and Comparison
Feature | KDD (Metal Shield) | NPP (Contact Seals) |
Sealing Performance | Low, dust-resistant | High, water and oil-resistant |
Friction | Non-contact, low friction | Contact-type, higher friction |
Applicable Speed | High-speed operations | Low-to-medium-speed operations |
Applicable Environment | Clean, dusty environments | Humid, oily, or complex environments |
Special statement
All the items have enough number in our store. If you need more of them, please contact us. And if you need other parts not in our listing, please contact us too. We have a large variety printer accessories, and some of them are not listed. Just send a message to contact us, we will help you to find the item you need.
SHIPPING & HANDLING
1.Int'l Post Airmail:
Fixed fee for Shipping & Handling, including packing, warehouse, distribution, order handling and processing costs. Item will be shipped to winning Buyers within 24 hours upon receiving the payment. The parcel with item will be shipped from Hong Kong or China by Flat Air Mail or Registered Air Mail.
The delivery time usually takes 1-2 weeks (max 3 weeks). Buyers are responsible for additional COD charges, VAT, Customs fees, and import duty (if any).
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2. Combined Shipping:
Worldwide | 1st item | Combined Shipping |
Airmail 1-2 Weeks | Shipping free | Shipping free |
You can combine all your items within 14 days of first won item. One payment must be made for all items at one time, so that shipping & handling discount may be given.
PAYMENT METHODS
Payment should be made within 14 days since the winning of the first item.
Non-paying winners will be reported to eBay. Serious bidders only please. Please email us with any questions you may have during the transaction.
TERMS OF SALES
Customer satisfaction is our top goal. All products are quality checked. They are in good condition when shipped to our customers. If product is defective or damage upon arrival, or wrong product shipped, please contact us immediately. Returns accepted within 30 days of delivery date and item must be in original new condition, not worn or altered in any way with attached tags & wrap. Otherwise deal is final. Return shipping must be paid by buyer.
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CONTACT US
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