Interpretation and Selection Suggestions:

· Structure and Space: Both the RPNA and RNAO types belong to "outer ringless" bearings. This design can save radial space, but it requires the surface hardness and precision of the installed shaft to be sufficiently high so that it can be directly used as the raceway. The NKS40 type, however, has an inner ring and is easier to install and maintain, but it requires slightly more space.

· Load Capacity and Thickness: The thickness (width) of the bearing directly affects its load capacity. As can be seen from the comparison, the dynamic load of the RNAO40X55X40 with a thickness of 40mm is much higher than that of the RPNA40/55 with a thickness of 20mm. Therefore, in heavy-load situations, the wider model should be preferred.

· Other Types: In the search results, there are other needle roller bearings with an inner diameter of 40mm (such as NKIS40, combined bearing NKIB 5908), but their outer diameters are all greater than 55mm, which do not match the specifications you queried.

 FAQ 

Q1: How do you pack them?

Generally speaking, we first use plastic bags to pack the carburetor, and then put the carburetor with a good bag in an independent packaging box, white, about the box, there are white boxes, cowhide boxes, and color boxes, you can choose according to your needs, a large number of products can be customized color boxes, and then use cowhide cartons to pack all the products, and finally use woven bags to pack. The cargo will be more secure. If you have other special requirements, we can pack according to your requirements.

Q2: How did you make our business relationship good over the long term?

1. We will always control the quality of carburetors, provide competitive prices, to ensure the interests of customers and establish stable partners;;

2. Every customer is our friend, no matter where they come from, we sincerely do business with them. 

Q3: How is the quality control in your factory?

Quality assurance is our core competence. Every one of our products must pass 100% inspection before shipment.

Q4:Can I customize my carburetor？

Our factory supports customization, as long as you meet the MOQ, we welcome everyone to customize their own brand, or to modify the appearance of the carburetor, such as changing the bottom cover of other colors, adding the LOGO of the carburetor, and customizing the independent packaging box of the carburetor and the outer box.