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Why Do CURT Trailer Hitch Balls 40038 and A-90 have Such Different Towing Capacities

Question:

How can the Curt 40038 2inch ball with the 1inch shank have a higher GTW 12,000 lbs than the Curt A-90 2inch ball with the 1-1/4inch shank 8,000 lbs? Thanks

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Expert Reply:

I spoke with my contact at CURT and he told me what gives the CURT Hitch Ball, # 40038, more strength is the way it is threaded and that it is heat treated beyond what # A-90 is so that gives the 40038 the higher rating. He added that even though 40038 has a smaller shank, the way that the metal was finished allowed it to be tested and rated higher.

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