you master good! Ask a question about the use of tapered roller bearings: a mechanism using a double row tapered roller bearings, but did not buy this model, can use two single row tapered roller bearing together instead of double row?
3, load and life usually do not vary greatly, this is a personal opinion. I hope I can help you!
2, the clamping way is: double row bearing inner ring is double row, or outer ring double, determines when you install the inner ring or outer ring is clamped, clamped, if you want to replace with the two row, when combined with the clearance you need to consider the ring, you should adjust the clearance and is placed on the inner ring, or on the outside, too that depends on your way of clamping;
Not so simple, please consider the following: 1, clearance of double row bearings generally have clearance design, and no single, you need to set in the middle of every lap, with good clearance, clearance or big or small, or no clearance, you miserable;