The RBC Bearings SJ9718 is a pretty solid choice for tough applications. According to the manufacturer's description, it works well in both sealed and unsealed versions, which makes it pretty versatile and reliable across different environments.

From our research, this bearing is especially suited for things like helicopter rotors, marine crankshafts, and oil field pumping jacks. So, if you're in industries like aerospace, marine, or oil extraction, where conditions can get harsh, this bearing might be your go-to.

The sealed version offers extra protection against dirt, moisture, and other things that could mess with its performance and longevity. This is really helpful in situations where it’s hard to get to the bearings for maintenance.

On the other hand, the unsealed version might work best in a clean, controlled environment where you can maintain or clean it often, and you don't need as much protection against contaminants. This could also save you some costs while still keeping things running smoothly.

When deciding between the two, think about your specific conditions and how often you can do maintenance. If your setup deals with rough conditions and maintenance is rare, you might prefer the sealed version.

But in more controlled settings with regular maintenance, the unsealed SJ9718 could be more economical yet still effective.

All in all, the SJ9718 is built to handle a wide range of industrial demands. So whether you’re working on a helicopter rotor or an oil field pumping jack, it's designed to tackle these challenges well, offering solid performance whether sealed or unsealed.

It sounds like you're looking into the RBC Bearings SJ9718 from their Pitchlign Heavy Duty Needle Roller Bearings range. If you're seeking something for demanding applications like helicopter rotors or marine crankshafts, these might be a solid choice.

From our research, these bearings are appreciated for staying smooth and enduring a lot of wear and tear. They’re designed with durability in mind, although we couldn't pinpoint the exact load rating from the info we have. Still, the manufacturer's description hints that they're built tough to handle significant stress.

These bearings are quite versatile, fitting into various setups across different industries. You can get them in both sealed and unsealed versions, depending on what your machinery requires. They're engineered for precise movement, which is always a plus when you're looking for reliable and efficient performance.

If your focus is on dependable and effective bearing options, these could be worth considering.

But I'd recommend checking in with a supplier or the manufacturer directly for the exact load rating and any other details that might be crucial for your specific needs. That way, you can be sure they’ll work for what you have in mind.

I wasn't able to find the exact dimensions for the RBC Bearings SJ9718 needle roller bearing in the information provided. If you need those specifics, it might be best to check out the manufacturer's technical sheets or documentation directly.

If you're curious about its use, though—according to the manufacturer's description, this bearing is meant for heavy-duty tasks and should be lubricated with grease for smooth operation and less wear.

For anything technical like precise measurements, getting in touch with the manufacturer or supplier should provide the details you're after.