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How to Determine the Capacity of 2 Inch Square Axle


I have a 2 inch square axle, that has a round brake flange, I think the hole pattern is 5 x 3 7/8, It has 12, yes I said 12 leaf springs. Im trying to figure out 1 How much weight the axle can handle? 2 Why there are 12 leaf springs? 3 Is part #23-458 and #23-459 the right replacement brake assembly for this axle? 4 Anything else you can tell me about this axle would be much appreciated. I have enclosed a couple of pictures, thanks for your time


Expert Reply:

Square axles can be tough to determine capacity since the same spindle can typically fit a range of axle capacities. With this being said the absolute best way to determine the capacity of your axle is to locate a plate/sticker on the axle itself or on the trailer. If this is not available we can take a few steps to try and narrow it down for you.

1) A 2 inch square axle using a 5 on 3-7/8 inch brake mounting flange is typical of 5,200, 6,000, and 7,000 lb axles. If you can provide the inner and outer bearing numbers, wheel size, and wheel bolt pattern, we may be able to narrow it down further.

2) Different manufactures use different designs and construction so there really is no solid answer as to why this trailer uses a 12 leaf set-up. The amount of leaves will not determine their capacity.

3) If your brake mounting flange does indeed have a 5 on 3-7/8 inch bolt pattern then you could use the 12 Inch Nev-R-Adjust Electric Brake Assembly for 6,000 LB Axle, # 23-458 for left hand side and # 23-459 for right hand. Although rated for 6,000 capacity, these will still work with a 5,200 or 7,000 lb axle as well. I have also included a link which explains how to determine bolt pattern for you.

4) Thanks for the picture. If you would like to send me the bearing numbers, wheel size, and wheel bolt pattern, I will be happy to see if I can narrow the axle capacity down any further for you.

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