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Yes. 2040 ends in 0 or 5, so it is divisible by 5.
No. 2 + 0 + 4 + 0 = 6 which is not 9, so 2040 is not divisible by 9.
Externally the 1040 and 2040 "F" concentric units have the same dimensions. The 1040 unit was introduced in 1979. The 2040 unit was introduced in the mid-90's with improved mechanical ratings as compared to the 1040. The 2040 utilizes tapered roller bearings throughout.
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